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Effects of strain-induced melt activation treatment on the microstructure and properties of Zn sacrificial anodes 被引量:1
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作者 Behrooz Shayegh Boroujeny Payam Raiesi Goojani Ehsan Akbari 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第10期1693-1704,共12页
The microstructural properties and electrochemical performance of zinc(Zn)sacrificial anodes during strain-induced melt activation(SIMA)were investigated in this study.The samples were subjected to a compressive ratio... The microstructural properties and electrochemical performance of zinc(Zn)sacrificial anodes during strain-induced melt activation(SIMA)were investigated in this study.The samples were subjected to a compressive ratio of 20%-50% at various temperatures(425-435℃)and durations(5-30 min).Short-term electrochemical tests(anode tests)based on DNV-RP-B401 and potentiodynamic polarization tests were performed in 3.5wt%NaCl solution to evaluate the electrochemical efficiency and corrosion behavior of the samples,respectively.The electrochemical test results for the optimum sample confirmed that the corrosion current density declined by 90% and the anode efficiency slightly decreased relative to that of the raw sample.Energy-dispersive X-ray spectroscopy,scanning electron microscopy,metallographic images,and microhardness profiles showed the accumulation of alloying elements on the boundary and the conversion of uniform corrosion into localized corrosion,hence the decrease of the Zn sacrificial anode’s efficiency after the SIMA process. 展开更多
关键词 strain-induced melt activation process zinc sacrificial anode corrosion resistance anode test
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SIMA法制备AZ91D镁合金非枝晶组织锭料 被引量:27
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作者 李元东 郝远 阎峰云 《甘肃工业大学学报》 北大核心 2002年第4期34-38,共5页
研究了利用应变诱发熔体激活法SIMA(Strain InducedMeltActivation)制备AZ91D镁合金半固态非枝晶时的组织转变过程.实验结果表明:具有树枝晶形态的AZ91D合金经20%及30%的预变形后,在半固态升温(540~580℃)或保温(570℃)过程中,其组织... 研究了利用应变诱发熔体激活法SIMA(Strain InducedMeltActivation)制备AZ91D镁合金半固态非枝晶时的组织转变过程.实验结果表明:具有树枝晶形态的AZ91D合金经20%及30%的预变形后,在半固态升温(540~580℃)或保温(570℃)过程中,其组织形貌由粗化的等轴晶及短树枝晶依次转变为小块状细晶粒→团块状→球状大晶粒.另外,在等温热处理过程中,试样内部体系寻求能量最低状态也是组织转变的一个不可忽略的因素.与未预变形的合金制备的非枝晶组织相比较,经预变形处理的试样是较好的半固态成型材料. 展开更多
关键词 sima AZ91D镁合金 非枝晶组织 锭料 应变诱发熔体激活法 半固态成形 组织演变 声像计算机通讯 AVCC
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SIMA法工艺参数对7075铝合金半固态组织的影响 被引量:4
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作者 李春晓 赵丹 +3 位作者 郑小平 田亚强 宋进英 陈连生 《热加工工艺》 CSCD 北大核心 2015年第11期22-24,32,共4页
利用应变诱发熔化激活法(SIMA)制备了7075铝合金半固态坯料。分别研究了变形程度、半固态加热温度与保温时间对7075铝合金半固态坯料显微组织的影响。结果表明:变形程度越大,再结晶形核率越高,获得的半固态固相颗粒越均匀、细小;半固态... 利用应变诱发熔化激活法(SIMA)制备了7075铝合金半固态坯料。分别研究了变形程度、半固态加热温度与保温时间对7075铝合金半固态坯料显微组织的影响。结果表明:变形程度越大,再结晶形核率越高,获得的半固态固相颗粒越均匀、细小;半固态加热温度越高,则半固态组织的固相颗粒越细小,液相率越高;当保温时间为30 min时,固相颗粒球化最好、最均匀。 展开更多
关键词 应变诱发熔化激活法(sima) 工艺参数 7075铝合金 半固态显微组织
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SIMA处理工艺参数对AZ61镁合金组织和性能的影响 被引量:3
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作者 张发云 揭小平 +1 位作者 闫洪 杨国泰 《南昌大学学报(理科版)》 CAS 北大核心 2005年第5期489-492,496,共5页
采用应变诱发熔体激活法(SIMA)制备出AZ61镁合金半固态坯料,同时对其组织演变过程进行观察,并研究预形变量和等温处理对组织及其机械性能的影响。试验样品经过0%、22%、40%的预形变量和各种加热温度处理。结果表明:在相同的等温温度条件... 采用应变诱发熔体激活法(SIMA)制备出AZ61镁合金半固态坯料,同时对其组织演变过程进行观察,并研究预形变量和等温处理对组织及其机械性能的影响。试验样品经过0%、22%、40%的预形变量和各种加热温度处理。结果表明:在相同的等温温度条件下,预形变量越大,维氏硬度也越高。具有树枝晶形态的AZ61镁合金经22%预形变量后,在加热温度为595℃、保温时间40 min条件下,可以制备出理想的AZ61镁合金半固态非枝晶组织,而未经预变形的AZ61镁合金不宜进行半固态制坯。 展开更多
关键词 应变诱发熔体激活法 镁合金 组织演变
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SIMA法制备半固态AM60-2Nd镁合金组织的演变 被引量:2
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作者 丁志强 苏桂花 +2 位作者 程世利 刘学然 陆展 《热加工工艺》 CSCD 北大核心 2018年第17期20-24,共5页
主要研究了等温温度和等温时间对应变诱导熔化激活法制备的半固态AM60-2Nd合金组织演变的影响。结果表明,在230℃以45%的压缩比压缩变形后,组织呈明显的纤维流线状,针状Al11)Nd3相被拉长、碎断成颗粒状不连续分布在晶界上。随着等温温... 主要研究了等温温度和等温时间对应变诱导熔化激活法制备的半固态AM60-2Nd合金组织演变的影响。结果表明,在230℃以45%的压缩比压缩变形后,组织呈明显的纤维流线状,针状Al11)Nd3相被拉长、碎断成颗粒状不连续分布在晶界上。随着等温温度的升高或等温时间的延长,固相颗粒圆整度增加,固相率减少。固相颗粒尺寸随等温温度的升高先减小后增大,随时间的延长一直增大。综合考虑,在590℃保温17~20 min或600℃保温15 min可获得最佳的半固态球状组织。在等温处理期间,呈颗粒状弥散分布的Al11Nd3相在高温下对晶界有明显的钉扎作用,通过阻碍再结晶过程以及减慢Ostwald熟化速度,获得细小的半固态球状组织。 展开更多
关键词 AM60合金 Nd元素 应变诱导熔化激活法 半固态 等温处理
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EFFECT OF PREDEFORMATION MANNER ON SEMI-SOLID STRUCTURE OF AZ61 MAGNESIUM ALLOY IN SIMA PROCESS 被引量:3
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作者 G.P. Chen T.R. Zhou H. Yan 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2008年第3期197-204,共8页
The effect of predeformation manner, predeformation ratio and isothermal heat-treat parameter on the non-dendrite structure of AZ61 magnesium alloy in SIMA process was studied. Under coequal heat-treat condition, the ... The effect of predeformation manner, predeformation ratio and isothermal heat-treat parameter on the non-dendrite structure of AZ61 magnesium alloy in SIMA process was studied. Under coequal heat-treat condition, the impact of the hot upsetting pre- deformation on semi-solid microstructure in SIMA process was compared with that of the cold compressive predeformation. The results indicate that non-dendrite microstructure in AZ61 magnesium alloy billets can be obtained by hot or cold upsetting predeformation in SIMA process, although their mechanisms of evolution are different. Increasing hot or cold upsetting predeformation ratio can enhance the effect and quality of the non-dendrite microstructure formed before storage energy up to saturation, but the proper isothermal temperature and holding time should be selected. 展开更多
关键词 AZ61 magnesium alloy strain-induced melt activated sima Hot and cold upsetting PREDEFORMATION Non-dendrite structure
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Microstructure of semi-solid ADC12 aluminum alloy adopting new SIMA method 被引量:4
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作者 王振宇 吉泽升 +1 位作者 孙丽鑫 许红雨 《中国有色金属学会会刊:英文版》 CSCD 2010年第S3期744-748,共5页
A semi-solid microstructure of ADC12 aluminum alloy containing spherical solid particles was studied.A new strain-induced melt activation(SIMA) process was proposed.In the treatment,chips were cut from ADC12 ingot by ... A semi-solid microstructure of ADC12 aluminum alloy containing spherical solid particles was studied.A new strain-induced melt activation(SIMA) process was proposed.In the treatment,chips were cut from ADC12 ingot by lathe machining and the plastic deformation was produced through cutting.The chips were put into a metal mold and compressed into a billet at 473 K.The microstructures of chip and billet were studied.The effect of the isothermal treatment on the semi-solid microstructure evolution of ADC12 aluminum alloy prepared by the new method was analyzed.A series of heating treatments were carried out from 823 to 838 K.The effects of heating temperature on microstructures were studied.The experimental results show the ADC12 aluminum alloy prepared by the new method can reap homogeneous and spherical grains at 828 K.The average grain size is about 82 μm.Also,the grain microstructure obtained by the present process is better than the traditional one.These results prove that the ADC12 aluminum alloy can be applied to semi-solid processing with the new SIMA method. 展开更多
关键词 ADC12 ALUMINUM alloy SEMI-SOLID MICROSTRUCTURE strain-induced melt activation
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Effect of compression ratio on microstructure evolution of Mg−10%Al−1%Zn−1%Si alloy prepared by SIMA process 被引量:3
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作者 Li-jie CAO Guo-rui MA +2 位作者 Chun-xia WANG Zheng-jian CHEN Jia-heng ZHANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2021年第9期2597-2605,共9页
A new Mg−10%Al−1%Zn−1%Si alloy with non-dendritic microstructure was prepared by strain induced melt activation(SIMA)process.The effect of compression ratio on the evolution of semisolid microstructure of the experime... A new Mg−10%Al−1%Zn−1%Si alloy with non-dendritic microstructure was prepared by strain induced melt activation(SIMA)process.The effect of compression ratio on the evolution of semisolid microstructure of the experimental alloy was investigated.The results indicate that the average size ofα-Mg grains decreases and spheroidizing tendency becomes more obvious with the compression ratios increasing from 0 to 40%.In addition,the eutectic Mg2Si phase in the Mg−10%Al−1%Zn−1%Si alloy transforms completely from the initial fishbone shape to globular shape by SIMA process.With the increasing of compression ratio,the morphology and average size of Mg2Si phases do not change obviously.The morphology modification mechanism of Mg2Si phase in Mg−10%Al−1%Zn−1%Si alloy by SIMA process was also studied. 展开更多
关键词 Mg−Al−Zn−Si alloy compression ratio microstructure evolution eutectic Mg2Si phase strain induced melt activation(sima)process
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Microstructure of AZ91D magnesium alloy semi-solid billets prepared by SIMA method from chips 被引量:1
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作者 许红雨 吉泽升 +1 位作者 胡茂良 王振宇 《中国有色金属学会会刊:英文版》 CSCD 2010年第S3期749-753,共5页
AZ91D magnesium alloy chips were adopted to prepare semi-solid billets.The chips were subjected to a series ofisothermal treatments for various holding times at 783?843 K after being compressed into billet at 523 K.Th... AZ91D magnesium alloy chips were adopted to prepare semi-solid billets.The chips were subjected to a series ofisothermal treatments for various holding times at 783?843 K after being compressed into billet at 523 K.The semi-solid microstructure of AZ91D magnesium alloy containing spherical solid particles was studied.The effects of reheating temperature and holding time on microstructures were investigated.And the semi-solid forming mechanism was discussed.The result shows that semi-solid billets with highly spheroidal and homogeneous grains can be prepared from chips by strain induced melt activation(SIMA) method.Meanwhile,it is found that increasing the heating temperature can accelerate the spheroidizing process and reduce the solid volume fraction.With the increase of the holding time,the solid particles become more globular,the grains grow slowly and the solid volume fraction slightly changes.At the same time,owing to the decrease ofinterfacial energy,the intragranular liquid phases form by the diffusion of solute atoms,the grain boundaries melt and grains separate from each other during the isothermal treatment.The grains gradually spheroidize and begin to merge with a further increase of the holding time.It is considered that the semi-solid forming process includes three stages:the recrystallization and the growth of grain stage,the semi-solid microstructure forming stage controlled by the diffusion of solute,and the spheroidization of solid particle stage controlled by the liquid-solid interface tension. 展开更多
关键词 AZ91D MAGNESIUM alloy chip strain induced melt activation(sima) SEMI-SOLID MICROSTRUCTURE evolution mechanism
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Compound fabrication technology of semi-solid billet of Al-Si alloy based on SIMA method 被引量:1
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作者 薛克敏 弭光宝 王清瑞 《中国有色金属学会会刊:英文版》 CSCD 2006年第A03期1224-1231,共8页
Based on SIMA, the Al-Si alloy semi-solid billets were successfully fabricated by means of strain inducement and isothermal treatment for AlSi9Mg poured in the range of near-liquidus. Through orthogonal test, the effe... Based on SIMA, the Al-Si alloy semi-solid billets were successfully fabricated by means of strain inducement and isothermal treatment for AlSi9Mg poured in the range of near-liquidus. Through orthogonal test, the effects of combination action of near-liquidus casting, strain inducement and isothermal treatment on the morphology of primaryα-Al phase of AlSi9Mg close to eutectic point were investigated, and the optimal match relation between the processing parameters of solidification, deformation parameters of strain inducement, processing parameters of isothermal treatment and microstructure parameters of semi-solid alloy was established. The results indicate that compared with the single near-liquidus casting or SIMA, the microstructure of primaryα-Al phase in AlSi9Mg alloy prepared by compound fabrication process is more homogeneous, with more globular and finer particles, which has average grain size of 40-50 urn and shape factor of greater than 0.75. After holding at 605℃for 30-40 min under a certain cooling rate, increased deformation volume in SIMA benefits the refinement of the grain and the improvement of the morphology for primary phase. 展开更多
关键词 合金 复合工艺 等温处理 有色金属
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异步轧制SIMA法制备半固态AM60镁合金的组织研究 被引量:1
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作者 姜龙 郑小平 +2 位作者 宋进英 田亚强 陈连生 《热加工工艺》 北大核心 2019年第19期20-22,29,共4页
采用异步轧制SIMA法制备了AM60半固态坯料,分析了轧前预热保温时间和半固态保温时间对半固态成形的影响,研究了异步轧制SIMA法制备半固态AM60镁合金的组织演化。结果表明:当轧制温度480℃和轧前预热时间12 min,半固态处理温度580℃和保... 采用异步轧制SIMA法制备了AM60半固态坯料,分析了轧前预热保温时间和半固态保温时间对半固态成形的影响,研究了异步轧制SIMA法制备半固态AM60镁合金的组织演化。结果表明:当轧制温度480℃和轧前预热时间12 min,半固态处理温度580℃和保温时间40 min时,半固态液相率高,固相颗粒均匀、圆整。异步轧制细化了铸态组织晶粒,为后续半固态形成提供了更多的形变储存能。 展开更多
关键词 异步轧制 应变诱导熔化激活(sima)法 轧前预热温度 半固态保温时间 AM60镁合金
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Structure evolution of AZ61 magnesium alloy in SIMA process
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作者 闫洪 张发云 揭小平 《中国有色金属学会会刊:英文版》 CSCD 2005年第3期560-564,共5页
The effect of prior compressive deformation, isothermal temperature and holding time on the structure of AZ61 magnesium alloy fabricated by strain-induced melt activation(SIMA) processing was investigated. The specime... The effect of prior compressive deformation, isothermal temperature and holding time on the structure of AZ61 magnesium alloy fabricated by strain-induced melt activation(SIMA) processing was investigated. The specimens were subjected under deformation ratios of 0%, 22% and 40% and various heat treatment time and temperature regions. The results indicate that the ideal technological parameters of semi-solid AZ61 alloy produced with non-dendrites are recommended as 22% (prior compressive deformation), 595 ℃ (heat treatment temperature) and 40 min(time). The as-cast AZ61 magnesium alloy isn't fit for semi-solid forming. 展开更多
关键词 约束人造熔融活性 sima AZ61铝合金 非树枝状结晶 结构演化
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AZ61合金半固态二次加热工艺及组织演变 被引量:11
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作者 张发云 闫洪 +2 位作者 周天瑞 揭小平 胡勇 《塑性工程学报》 EI CAS CSCD 北大核心 2006年第4期100-103,共4页
研究了应力诱发熔体激活法(SIMA)制备的AZ61镁合金半固态坯料在二次加热时加热温度和保温时间对其组织的影响,研究表明,二次加热初期半固态组织首先熔合合并,随着保温时间延长,晶粒逐渐长大和球化,液相份数增加;保温温度越高,晶粒长大... 研究了应力诱发熔体激活法(SIMA)制备的AZ61镁合金半固态坯料在二次加热时加热温度和保温时间对其组织的影响,研究表明,二次加热初期半固态组织首先熔合合并,随着保温时间延长,晶粒逐渐长大和球化,液相份数增加;保温温度越高,晶粒长大和球化速度加快。在592℃加热、保温20min^40min,可以获得均匀、圆整的半固态组织,晶粒大小为80μm^90μm,液相率为40%~42%。高于597℃时,试样重熔过程中易发生严重变形。 展开更多
关键词 应力诱发熔体激活法 AZ61镁合金 重熔 组织演变
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重熔工艺对应变诱导熔化激活法制备ZCuSn10铜合金半固态组织的影响 被引量:8
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作者 吴龙彪 肖寒 +2 位作者 王佳 卢德宏 周荣 《中国有色金属学报》 EI CAS CSCD 北大核心 2013年第12期3302-3307,共6页
采用包括锻造与重熔的应变诱导熔化激活(SIMA)法制备ZCuSn10铜合金半固态坯料,分析重熔过程中重熔温度和保温时间对ZCuSn10半固态坯料微观组织的影响。结果表明:在900℃保温时,随着保温时间的延长,合金的平均晶粒直径增大,保温时间由5 ... 采用包括锻造与重熔的应变诱导熔化激活(SIMA)法制备ZCuSn10铜合金半固态坯料,分析重熔过程中重熔温度和保温时间对ZCuSn10半固态坯料微观组织的影响。结果表明:在900℃保温时,随着保温时间的延长,合金的平均晶粒直径增大,保温时间由5 min延长至50 min时,平均晶粒直径由45.9μm增大至74.7μm;晶粒形状因子随保温时间的延长先减小后增大。保温30 min时,随着保温温度的升高,平均晶粒直径减小,当保温温度由850℃升高至925℃时,平均晶粒直径由72.6μm减小至64.1μm;晶粒形状因子随保温温度的升高而增大。900℃保温30 min获得的半固态组织均匀、球化效果好,平均晶粒尺寸为64.7μm,形状因子为1.65。 展开更多
关键词 ZCuSn10铜合金 半固态 应变诱导熔化激活(sima)法 重熔工艺 晶粒尺寸 形状因子
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AZ61镁合金在形变诱导法中的组织演变 被引量:6
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作者 闫洪 张发云 +2 位作者 揭小平 罗忠民 杨国 《中国机械工程》 EI CAS CSCD 北大核心 2005年第8期719-722,共4页
研究了AZ61镁合金在应力诱发熔体激活法(SIMA)制备半固态坯料过程中预变形量、等温温度和保温时间对其组织的影响。试验样品经过0、22%、40%的预变形和不同等温热处理条件处理,结果表明,制备AZ61 镁合金半固态非枝晶组织的理想工艺参数... 研究了AZ61镁合金在应力诱发熔体激活法(SIMA)制备半固态坯料过程中预变形量、等温温度和保温时间对其组织的影响。试验样品经过0、22%、40%的预变形和不同等温热处理条件处理,结果表明,制备AZ61 镁合金半固态非枝晶组织的理想工艺参数为形变量22%、等温温度595℃、保温时间40min。未预变形AZ61镁合金不宜进行半固态制坯。 展开更多
关键词 应力诱发熔体激活法 AZ61镁合金 非枝晶组织 组织演变
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铝含量对应变诱发法半固态镁合金的影响 被引量:4
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作者 张倩倩 曹占义 刘勇兵 《材料热处理学报》 EI CAS CSCD 北大核心 2010年第4期24-28,共5页
结合半固态合金成分设计原则,通过热力学计算,研究了3种成分的半固态镁合金。通过组织观察和流变学参数分析表明,半固态组织的形成速度随铝含量增加而加快,固相粒子变得细小、圆整。分析得出铝元素主要通过两个方面影响半固态组织,一个... 结合半固态合金成分设计原则,通过热力学计算,研究了3种成分的半固态镁合金。通过组织观察和流变学参数分析表明,半固态组织的形成速度随铝含量增加而加快,固相粒子变得细小、圆整。分析得出铝元素主要通过两个方面影响半固态组织,一个是液相形核,另一个是再结晶晶粒尺寸。随着铝含量增加,液相形核数量增多,再结晶晶粒尺寸减小,这些都促进了半固态组织的形成和演变,有利于镁合金半固态加工。 展开更多
关键词 镁合金 铝含量 半固态 应变诱发
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半固态加热工艺对7075合金组织与性能的影响 被引量:2
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作者 李春晓 郑小平 +3 位作者 赵丹 田亚强 宋进英 陈连生 《铸造技术》 CAS 北大核心 2016年第4期701-705,共5页
利用应变诱发熔化激活法(SIMA)制备了7075铝合金半固态坯料。研究了半固态加热温度与保温时间对7075铝合金半固态坯料显微组织及压缩性能的影响。结果表明:半固态等温温度越高,球形率越好,液相率越高,初生α-Al固相颗粒的尺寸呈先降后... 利用应变诱发熔化激活法(SIMA)制备了7075铝合金半固态坯料。研究了半固态加热温度与保温时间对7075铝合金半固态坯料显微组织及压缩性能的影响。结果表明:半固态等温温度越高,球形率越好,液相率越高,初生α-Al固相颗粒的尺寸呈先降后升的趋势,而坯料的抗压强度则呈与之相反的趋势,等温温度595~610℃时达到理想状态;随着保温时间的延长,初生α-Al固相颗粒的球形率越好,颗粒尺寸逐渐增大,液相率无明显变化,而坯料的抗压强度呈先升高后略微下降的趋势,保温时间15~30 min时达到理想状态;在595℃保温30 min时,获得的7075铝合金半固态坯料的初生固相颗粒均匀、细小、圆整,抗压强度可达426.82 MPa。 展开更多
关键词 应变诱发熔化激活法 7075铝合金 半固态显微组织 抗压强度
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冷变形对LC9铝合金等温转变半固态组织的影响 被引量:7
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作者 隋少华 宋天革 隋鲁华 《铸造》 EI CAS CSCD 北大核心 2006年第7期683-685,共3页
对冷变形金属进行等温加热转变制备半固态LC9铝合金坯料,并对其工艺过程及组织演变进行了研究,讨论了变形量、加热温度和保温时间等工艺参数对LC9铝合金组织的影响。结果表明,对冷变形金属采用等温处理,可获得均匀、细小的半固态坯料,... 对冷变形金属进行等温加热转变制备半固态LC9铝合金坯料,并对其工艺过程及组织演变进行了研究,讨论了变形量、加热温度和保温时间等工艺参数对LC9铝合金组织的影响。结果表明,对冷变形金属采用等温处理,可获得均匀、细小的半固态坯料,很好地满足半固态制坯的要求;增加变形量使组织中的液相比例明显增加,晶粒尺寸变小;提高加热温度或延长保温时间有利于晶粒粒化,但是过高的温度和保温时间,会加快晶粒长大,促使晶粒粗化。 展开更多
关键词 等温加热 半固态LC9铝合金 组织演变
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形变AZ91D镁合金重熔过程中共晶激活能研究 被引量:1
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作者 王武孝 邢建东 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2008年第2期354-356,共3页
采用DSC技术研究了SIMA法制备半固态AZ91D镁合金坯料过程中形变率与共晶熔化激活能的关系。结果表明:形变AZ91D镁合金内部存在位错、孪晶缺陷,合金的共晶熔化激活能随变形率的增大而变小,当形变率达到40%时,共晶熔化激活能下降很少;共... 采用DSC技术研究了SIMA法制备半固态AZ91D镁合金坯料过程中形变率与共晶熔化激活能的关系。结果表明:形变AZ91D镁合金内部存在位错、孪晶缺陷,合金的共晶熔化激活能随变形率的增大而变小,当形变率达到40%时,共晶熔化激活能下降很少;共晶熔化开始温度随变形率的增大略有下降。 展开更多
关键词 镁合金 应变诱发熔化激活法(sima) 形变率 共晶熔化激活能 DSC
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Effects of semi-solid isothermal process parameters on microstructure of Mg-Gd alloy 被引量:6
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作者 苏桂花 曹占义 +3 位作者 刘勇兵 王玉慧 张亮 程丽任 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第B07期402-406,共5页
The effects of semi-solid isothermal process parameters on the microstructure evolution of Mg-Gd rare earth alloy produced by strain-induced melt activation(SIMA)were investigated.The formation mechanism of the partic... The effects of semi-solid isothermal process parameters on the microstructure evolution of Mg-Gd rare earth alloy produced by strain-induced melt activation(SIMA)were investigated.The formation mechanism of the particles in the process of the isothermal treatment was also discussed.The results show that the microstructure of the as-cast alloy consists ofα-Mg solid solution, Mg5RE and Mg24RE5(Gd,Y,Nd)phase.After being extruded with an extrusion ratio of 14:1 at 380℃,the microstructure of Mg-Gd alloy changes from developed dendrites to near-equiaxed grains.The liquid volume fraction of the semisolid slurry gradually increases with elevating isothermal temperature or prolonging isothermal time during the partial remelting.To obtain an ideal semisolid slurry,the optimal process parameters for the Mg-Gd alloy should be 630℃for isothermal temperature and 30 min for the corresponding time,respectively,where the volume fraction of the liquid phase is 52%. 展开更多
关键词 magnesium alloy Mg-Gd alloy rare earth strain-induced melt activation SEMISOLID isothermal treatment
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