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Al-Si相变材料的研究与应用
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作者 陈枭 《中国高新技术企业》 2010年第23期52-53,共2页
铝硅合金相变储能材料吸放热过程中,储能密度大,过冷度小,导热率高,反复相变并长期性能稳定,因而在高温储热方面具有广泛的用途。
关键词 al-si相变材料 液态腐蚀 容性
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热成型钢板点焊过程中Al-Si 相偏聚分析
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作者 徐荣雷 刘旭涛 程先增 《汽车实用技术》 2020年第23期160-161,164,共3页
文章针对热成型点焊过程中产生的Al-Si相偏聚集进行了研究,分析了Al-Si相偏析产生的主要原因。经过调整电极压力和预热电流后,有效解决了Al-Si偏聚问题,保证了焊点力学性能满足使用要求。
关键词 热成型钢板 al-si相 电极压力 预热电流
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Microstructure-based analysis of fatigue behaviour of Al-Si-Mg alloy 被引量:1
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作者 蒋小松 何国求 +2 位作者 刘兵 范宋杰 朱旻昊 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第3期443-448,共6页
The effects of microstructural characteristics on the fatigue behavior in Al-Si-Mg alloy were investigated. The dislocation substructures of Al-Si-Mg alloy were observed by transmission electron microscopy (TEM). Di... The effects of microstructural characteristics on the fatigue behavior in Al-Si-Mg alloy were investigated. The dislocation substructures of Al-Si-Mg alloy were observed by transmission electron microscopy (TEM). Dislocation evolution process of α(Al) matrix with [011] orientation of Al-Si-Mg alloy specimens was observed during fatigue process under different stress amplitudes and cycles. The results indicate that dislocation structure is closely dependent on stress amplitudes, and the density of dislocation in failure specimens increases with increasing stress amplitudes. The results show that Mg2Si and secondary silicon phase could have a strong hindrance effect on the movement of dislocations during the fatigue process. The fatigue behavior is strongly dependent on the microstructure of material. 展开更多
关键词 al-si-Mg alloy DISLOCATION MG2SI secondary silicon phase
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Dry sliding wear behavior of rheocast hypereutectic Al-Si alloys with different Fe contents 被引量:1
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作者 林冲 吴树森 +2 位作者 吕书林 曾劲彪 安萍 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第3期665-675,共11页
The effect of iron content on wear behavior of hypereutectic Al?17Si?2Cu?1Ni alloy produced by rheocasting process was investigated. The dry sliding wear tests were carried out with a pin-on-disk wear tester. The resu... The effect of iron content on wear behavior of hypereutectic Al?17Si?2Cu?1Ni alloy produced by rheocasting process was investigated. The dry sliding wear tests were carried out with a pin-on-disk wear tester. The results show that the wear rate of the rheocast alloy is lower than that of the alloy produced by conventional casting process under the same applied load. The fine particle-likeδ-Al4(Fe,Mn)Si2 and polygonalα-Al15(Fe,Mn)3Si2 phases help to improve the wear resistance of rheocast alloys. As the volume fraction of fine Fe-bearing compounds increases, the wear rate of the rheocast alloy decreases. Moreover, the wear rate of rheocast alloy increases with the increase of applied load from 50 to 200 N. For the rheocast alloy with 3% Fe, oxidation wear is the main mechanism at low applied load (50 N). At higher applied loads, a combination of delamination and oxidation wear is the dominant wear mechanism. 展开更多
关键词 dry sliding wear hypereutectic al-si alloy RHEOCASTING Fe-bearing compound wear mechanism
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Effects of Mg content on primary Mg_2Si phase in hypereutectic Al-Si alloys 被引量:5
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作者 黄治黎 王开 +3 位作者 张志明 李波 薛寒松 杨大壮 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第10期3197-3203,共7页
Hypereutectic Al-Si alloy with variant Mg contents were fabricated by casting,and the effects of Mg content on the microstructure of primary Mg2Si particles in hypereutectic Al-Si alloys were investigated.The results ... Hypereutectic Al-Si alloy with variant Mg contents were fabricated by casting,and the effects of Mg content on the microstructure of primary Mg2Si particles in hypereutectic Al-Si alloys were investigated.The results show that the volume fraction of primary Mg2Si particles increases linearly with raising the Mg content,but the average size of Mg2Si particles does not exhibit a corresponding change.When the Mg content is 3%,á1 0 0? directions have the fastest growth velocity,so that Mg2Si particles are likely to form octahedron shape.When gradually increasing the Mg content,the distributions of Mg and Si atoms on the solid-liquid interface become inhomogeneous,which results in the formation of irregular octahedron structures.Finally,when the Mg content is about 10%,the morphology of primary Mg2Si particles changes from the octahedron shape into various complex structures with a large size. 展开更多
关键词 hypereutectic al-si alloys primary Mg2Si particles growth pattern growth velocity
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Influence of high pressure and manganese addition on Fe-rich phases and mechanical properties of hypereutectic Al-Si alloy with rheo-squeeze casting 被引量:12
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作者 Chong LIN Shu-sen WU +2 位作者 Shu-lin Lü He-bao WU Han-xin CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第2期253-262,共10页
The influence of high pressure and manganese addition on Fe-rich phases(FRPs)and mechanical properties of Al-14Si-2Fe alloy with rheo-squeeze casting(RSC)was investigated.The semi-solid alloy melt was treated by ultra... The influence of high pressure and manganese addition on Fe-rich phases(FRPs)and mechanical properties of Al-14Si-2Fe alloy with rheo-squeeze casting(RSC)was investigated.The semi-solid alloy melt was treated by ultrasonic vibration(UV)firstly,and then formed by squeeze casting(SC).Results show that the FRPs in as-cast SC alloys are composed of coarseβ-Al5(Fe,Mn)Si,δ-Al4(Fe,Mn)Si2 and bone-shapedα-Al15(Fe,Mn)3Si2 phases when the pressure is 0 MPa.With RSC process,the FRPs are first refined by UV,and then the solidification under pressure further causes the grains to become smaller.The peritectic transformation occurs during the formation ofαphase.For the alloy with the same composition,the ultimate tensile strength(UTS)of RSC sample is higher than that of the SC sample.With the same forming process,the UTS of Al-14Si-2Fe-0.8Mn alloy is higher than that of Al-14Si-2Fe-0.4Mn alloy. 展开更多
关键词 high pressure MANGANESE rheo-squeeze casting hypereutectic al-si alloy Fe-rich phases mechanical properties
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Effect of Li content on microstructure and mechanical property of Mg-xLi-3(Al-Si) alloys 被引量:3
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作者 Cheng ZHANG Liang WU +6 位作者 Zi-long ZHAO Zhi-hui XIE Guang-sheng HUANG Lei LIU Bin JIANG Andrej ATRENS Fu-sheng PAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第12期2506-2513,共8页
Mg-4 Li-3(Al-Si),Mg-8 Li-3(Al-Si)and Mg-12 Li-3(Al-Si)alloys based on theα-Mg,α-Mg+β-Li,β-Li phases,respectively,were produced to investigate the effect of alloying with Al-Si eutectic on the microstructure and me... Mg-4 Li-3(Al-Si),Mg-8 Li-3(Al-Si)and Mg-12 Li-3(Al-Si)alloys based on theα-Mg,α-Mg+β-Li,β-Li phases,respectively,were produced to investigate the effect of alloying with Al-Si eutectic on the microstructure and mechanical properties of the three alloys.Alloying with the Al-Si eutectic of Mg-xLi(x=4,8 and 12 wt.%)alloys caused the formation of different types of Al-Li precipitates:Al3Li,AlLi and Li3Al2,respectively.Also,considerable quantities of Mg2Si phase particles were found in the three alloys.The results of tensile tests showed that the Mg-4Li-3(Al-Si)alloy exhibited the highest ultimate tensile strength(UTS)of 249 MPa but the lowest elongation of 6.3%.The Mg-12Li-3(Al-Si)alloy had the highest elongation of 26%but the lowest UTS of 173 MPa.The different mechanical properties were attributed to the different crystal structures of the three alloys and the precipitate with different type,morphology and distribution. 展开更多
关键词 Mg-Li alloy al-si eutectic second phase tensile strength ELONGATION
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Effect of melt holding on morphological evolution and sedimentation behavior of iron-rich intermetallic phases in Al-Si-Fe-Mn-Mg alloy 被引量:7
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作者 Dong-fu SONG Shun-cheng WANG +5 位作者 Yu-liang ZHAO Shu-hong LIU Yong DU Yue-hua KANG Zhi WANG Wei-wen ZHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第1期1-13,共13页
The effect of the melt holding temperature on the morphological evolution and sedimentation behavior of iron-rich intermetallics in Al-7.0 Si-1.0 Fe-1.2 Mn-0.25 Mg alloy was investigated using an optical microscope,sc... The effect of the melt holding temperature on the morphological evolution and sedimentation behavior of iron-rich intermetallics in Al-7.0 Si-1.0 Fe-1.2 Mn-0.25 Mg alloy was investigated using an optical microscope,scanning electron microscope and differential thermal analyzer.The results show that as the holding temperature decreases,the morphologies of the primary iron-rich phase in matrix change from star-like to polygonal,and the number of the primary phases gradually decreases and disappears at 615°C.Finally,the Chinese script phases with small size,high compact and uniform distribution are obtained.In contrast,the primary iron-rich phases in slag transform into a coarser polygonal shape with lower roundness,and some of them have hollow structures.Furthermore,the area fraction of intermetallics and Fe content in the matrix decrease gradually due to the formation and growth of sludge and subsequent natural sedimentation during melt holding.With the decrease of holding temperature,the main factors hindering the settlement of the primary phases are morphology,size,and density in turn. 展开更多
关键词 al-si alloy melt holding iron-rich intermetallic phases morphological evolution sedimentation behaviour
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微观组织对复合钎焊铝箔抗下垂性的影响 被引量:5
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作者 袁婷 涂益友 +1 位作者 张敏达 蒋建清 《材料热处理学报》 EI CAS CSCD 北大核心 2011年第9期121-124,共4页
借助于光学显微镜、扫描电镜和EBSD等手段,研究了芯材再结晶组织对复合钎焊铝箔抗下垂性能的影响。结果表明,在钎焊过程中皮材发生熔化,低熔点Al-Si共晶相从皮材向芯材渗入,降低了扩散层的熔点,使得在高温中支撑材料强度的芯材厚度降低... 借助于光学显微镜、扫描电镜和EBSD等手段,研究了芯材再结晶组织对复合钎焊铝箔抗下垂性能的影响。结果表明,在钎焊过程中皮材发生熔化,低熔点Al-Si共晶相从皮材向芯材渗入,降低了扩散层的熔点,使得在高温中支撑材料强度的芯材厚度降低,不利于抗下垂性能。而存在较小析出相的试样由于析出相钉扎亚晶界和位错运动,阻碍再结晶,最终形成沿轧向分布的长条状再结晶组织,Al-Si相渗入深度较小,材料的抗下垂性较好,且钎焊后的强度和伸长率并未有明显的降低。 展开更多
关键词 复合钎焊铝箔 al-si共晶 抗下垂性
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微观组织对复合钎焊铝材耐蚀性能的影响
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作者 袁婷 张全成 +3 位作者 耿飞 彭晓彤 苏朔 何天虎 《材料保护》 CAS CSCD 北大核心 2018年第8期20-25,共6页
目前,针对复合钎焊铝材钎焊前后的组织结构演变有较多研究,但针对组织与耐腐蚀性能之间的关系以及如何改善耐腐蚀性能的相关研究却报道甚少。采用循环酸性海水试验(SWAAT)盐雾腐蚀和电化学腐蚀中的极化曲线、电化学阻抗谱等方法,结合电... 目前,针对复合钎焊铝材钎焊前后的组织结构演变有较多研究,但针对组织与耐腐蚀性能之间的关系以及如何改善耐腐蚀性能的相关研究却报道甚少。采用循环酸性海水试验(SWAAT)盐雾腐蚀和电化学腐蚀中的极化曲线、电化学阻抗谱等方法,结合电子探针(EPMA)和能谱仪(EDS)等手段,研究了芯材再结晶组织对复合钎焊铝材耐腐蚀性能的影响。结果表明:在钎焊过程中皮材发生熔化,低熔点Al-Si共晶相沿晶界由皮材向芯材渗入,同时合金元素在皮材及其与芯材交界处发生富集;皮材表面粗大的Al-Si共晶相组织与铝基体间形成腐蚀微电池,引发晶间腐蚀并延伸至芯材内部;钎焊后形成长条状再结晶组织的试样由于扩散的高速通道减少,阻碍Al-Si相渗入及芯材合金元素在皮材晶界的富集行为,降低晶间腐蚀倾向,材料的耐腐蚀性能较好。 展开更多
关键词 复合钎焊铝材 al-si共晶 循环酸性海水试验(SWAAT) 电化学 耐腐蚀性能
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Three-dimensional modeling of effect of surface intermetallic phase on surface defects of Al-Fe-Si aluminum foils during twin-roll casting
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作者 朱远志 万强 +2 位作者 李丙亮 周峰 张雅峰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第2期477-483,共7页
Scanning electron microscopy and X-ray energy dispersive spectrum analysis show that the clusters of intermetallic AlFeSi particle are distributed on or near the aluminum foil stock surfaces heterogeneously. 3D finite... Scanning electron microscopy and X-ray energy dispersive spectrum analysis show that the clusters of intermetallic AlFeSi particle are distributed on or near the aluminum foil stock surfaces heterogeneously. 3D finite element modeling shows that these clusters of hard particles induce the fracture of the nano-scale lubricant oil film at first and further lead to severe deformation in the nearby aluminum foil substrate along the rolling direction. Consequently, the optical property in this region differs from that in the surroundings, resulting in surface defects. 展开更多
关键词 Al-Fe-Si alloy precipitated phase aluminum foils lubricant oil film twin-roll cast 3D modeling
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Precipitation of metastable phases and its effect on electrical resistivity of Al-0.96Mg_2Si alloy during aging 被引量:3
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作者 崔立新 刘振兴 +4 位作者 赵晓光 唐建国 刘科 刘星兴 钱晨 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第7期2266-2274,共9页
The precipitation behavior and its influence on the electrical resistivity of the Al-0.96Mg2Si alloy during aging were investigated with in-situ resistivity measurement and transmission electron microscopy (TEM). Th... The precipitation behavior and its influence on the electrical resistivity of the Al-0.96Mg2Si alloy during aging were investigated with in-situ resistivity measurement and transmission electron microscopy (TEM). The precipitates of the peak aged alloy include both β" and if, but the amount ratio of β" to β" varies with the aging temperature and time increasing. The precipitates during aging at 175 ℃ are dominated by needle-like β" phases (including pre-β" phase), the size of which increases with the time prolonging, but does not increase substantially after further aging. The evolution of electrical conductivity is directly related to such microstructural evolution. However, the hardness of the alloy stays at the peak value for a long term. When the alloy is aged at 195 ℃, the ratio of β" to β' becomes the main factor to influence relative resistivity (Ap) value. The higher the temperature is, the smaller the ratio is, and the faster the Ap value decreases. Moreover, the hardness peak drops with the decrease of the ratio. With the size and distribution parameters measured from TEM images, a semi-quantitative relationship between precipitates and the electrical resistivity was established. 展开更多
关键词 Al-Mg-Si alloy metastable phases electrical resistivity AGING PRECIPITATE
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Effect of Sr modification on microstructure and thermal conductivity of hypoeutectic Al−Si alloys 被引量:18
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作者 Jun-qi GAN Yu-jian HUANG +1 位作者 Cheng WEN Jun DU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第11期2879-2890,共12页
Trace amount of Sr(0.05 wt.%)was added into the hypoeutectic Al−Si(3−12 wt.%Si)alloys to modify their microstructure and improve thermal conductivity.The results showed that the thermal conductivity of hypoeutectic Al... Trace amount of Sr(0.05 wt.%)was added into the hypoeutectic Al−Si(3−12 wt.%Si)alloys to modify their microstructure and improve thermal conductivity.The results showed that the thermal conductivity of hypoeutectic Al−Si alloys was improved by Sr modification,and the increment and increasing rate of the thermal conductivity gradually increased with Si content increasing.The improvement of thermal conductivity was primarily related to the morphology variation of eutectic Si phases.In Sr-modified Al−Si alloys,the morphology of eutectic Si phases was a mixed morphology of fiber structure and fine flaky structure,and the proportion of the fine flaky eutectic Si phases gradually decreased with Si content increasing.Under the Si content reaching 9 wt.%,the proportion of fine flaky eutectic Si phases was nearly negligible in Sr-modified alloys.Correspondingly,the increment and increasing rate of thermal conductivity of Sr-modified alloys reached the maximum and tended to be stable. 展开更多
关键词 hypoeutectic Al−Si alloy Sr modification eutectic Si morphology thermal conductivity Al/Si interface
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Microstructures and corrosion behaviors of Al−6.5Si−0.45Mg−xSc casting alloy 被引量:1
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作者 Yu-kun MA Ming-xing WANG +1 位作者 Ya-nan LIU Bin CAI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第2期424-435,共12页
The microstructures and corrosion behaviors of the Al−6.5Si−0.45Mg casting alloys with the addition of Sc were investigated by using scanning electron microscopy,X-ray diffraction,electrochemical measurement technique... The microstructures and corrosion behaviors of the Al−6.5Si−0.45Mg casting alloys with the addition of Sc were investigated by using scanning electron microscopy,X-ray diffraction,electrochemical measurement techniques and immersion corrosion tests and compared with those of Sr-modified alloy.The results show that Sc has evident refining and modifying effects on the primaryα(Al)and the eutectic Si phase of the alloy,and the effects can be enhanced with the increase of Sc content.When the Sc content is increased to 0.58 wt.%,its modifying effect on the eutectic Si is almost same as that of Sr.Sc can improve the corrosion resistance of the test alloy in NaCl solution when compared with Sr,but the excessively high Sc content cannot further increase the corrosion resistance of the alloy.The corrosion of the alloys mainly occurs in the eutectic region of the alloy,and mostly the eutecticα(Al)is dissolved.This confirms that Si phase is more noble thanα(Al)phase,and the galvanic couplings can be formed between the eutectic Si andα(Al)phases. 展开更多
关键词 Al−Si−Mg casting alloy scandium(Sc) α(Al)phase eutectic Si phase corrosion resistance
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Preparation of Mo(Si,Al)_2 feedstock used for air plasma spraying
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作者 侯晖东 宁先进 +3 位作者 王全胜 高斌 柳彦博 刘颖 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第11期2939-2946,共8页
In order to prepare high quality Mo(Si,Al)2 feedstock characterized with C40 phase, higher Al doping amount andexcellent flowability, Mo(Si1-x,Alx)2 with different Al contents (x=0, 0.1, 0.2, 0.3, 0.4, 0.5) were... In order to prepare high quality Mo(Si,Al)2 feedstock characterized with C40 phase, higher Al doping amount andexcellent flowability, Mo(Si1-x,Alx)2 with different Al contents (x=0, 0.1, 0.2, 0.3, 0.4, 0.5) were synthesized by self-propagatinghigh-temperature synthesis first and Mo(Si0.6,Al0.4)2 was confirmed as the suitable material through X-ray diffraction analysis. Aseries of tests with different parameters of induction plasma spheroidization were applied to improving the flowability of feedstock.Mo(Si,Al)2 feedstock with excellent flowability (26.2 s/50 g) was prepared through adding hydrogen into sheath gas and decreasingthe powder feeding rate. The composition segregation occurred in the spheroidized powder after Al consumption and oxidation. Theinhomogeneous structure of the same particle was caused by the asymmetric heating and cooling when particle passed through theplasma jet. 展开更多
关键词 Mo(Si Al)2 C40 phase self-propagating high-temperature synthesis induction plasma spheroidization compositionsegregation
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Quantitative analysis of influence of α-Al(MnFeCr)Si dispersoids on hot deformation and microstructural evolution of Al-Mg-Si alloys 被引量:1
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作者 Hiromi NAGAUMI Jian QIN +2 位作者 Cheng-bin YU Xiao-guo WANG Lin-sheng WANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2022年第6期1805-1821,共17页
The microstructural evolution of AA6061 and Mn-bearing Al-Mg-Si-Cu alloys was studied by compression tests that were carried out between 300 and 500 °C with a wide range of strain rates. Compared to the AA6061 al... The microstructural evolution of AA6061 and Mn-bearing Al-Mg-Si-Cu alloys was studied by compression tests that were carried out between 300 and 500 °C with a wide range of strain rates. Compared to the AA6061 alloy, the large amount of α-Al(MnFeCr)Si dispersoids in the Mn-bearing alloy yielded a significant increase in the flow stress under all deformation conditions. The effects of the deformation parameters on the evolution of the microstructure were studied using electronic backscatter diffraction measurements. The predominant softening mechanism of both alloys was dynamic recovery. The presence of α dispersoids in Mn-bearing alloys effectively refined the size of substructures with misorientation angles in the range of 2°-5°, which retarded the dynamic recovery. To predict the subgrain size under various deformation conditions, the threshold stresses that were caused by α dispersoids were calculated by the modified Orowan equation and incorporated into a conventional constitutive equation. The subgrain size that was predicted by the modified constitutive equation showed satisfactory agreement with the experimental measurements. 展开更多
关键词 Al-Mg-Si alloy hot deformation α-Al(MnFeCr)Si dispersoids SUBSTRUCTURE dynamic softening threshold stress Z parameter
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Thermal stability and precipitate microstructures of Al−Si−Mg−Er alloy 被引量:4
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作者 Yi HE Hai-hui XI +5 位作者 Wen-quan MING Qin-qin SHAO Ruo-han SHEN Yu-xiang LAI Cui-lan WU Jiang-hua CHEN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第1期1-10,共10页
The effect of Er on the microhardness and precipitation behavior of the heat-treated Al−Si−Mg alloy was investigated by microhardness tester and TEM.As a comparison,the influence of natural aging was also studied.It i... The effect of Er on the microhardness and precipitation behavior of the heat-treated Al−Si−Mg alloy was investigated by microhardness tester and TEM.As a comparison,the influence of natural aging was also studied.It is shown that the thermal stability of the over-aged Al−Si−Mg−Er alloy is highly related to the average size of the precipitates.The average size ofβ''precipitates in Al−Si−Mg−Er alloy is smaller than that in Al−Si−Mg alloy,and the distribution is more localized under condition of without introducing natural aging.However,when natural aging is introduced before artificial aging,the Al−Si−Mg−Er alloy has similar average size and distribution of precipitates with the Al−Si−Mg alloy,resulting in similar mechanical properties.The effect of Er on the precipitation kinetics in the alloy was also discussed in detail to explain these phenomena. 展开更多
关键词 Al−Si−Mg alloy ER natural aging PRECIPITATE thermal stability
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