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元素粉末冷轧成形及反应合成制备Ti-Al合金板材 被引量:11
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作者 江垚 贺跃辉 +2 位作者 汤义武 李智 黄伯云 《中国有色金属学报》 EI CAS CSCD 北大核心 2004年第9期1501-1507,共7页
以Ti、Al元素粉末为原料,在粉末轧机上无包套冷轧成尺寸为500mm×230mm×1.5mm的板坯,其相对密度达85.9%。研究了不同工艺参数对Ti、Al元素粉末轧制板材的影响。取小样在不同温度下进行真空无压烧结,研究了板坯的真空烧结行为... 以Ti、Al元素粉末为原料,在粉末轧机上无包套冷轧成尺寸为500mm×230mm×1.5mm的板坯,其相对密度达85.9%。研究了不同工艺参数对Ti、Al元素粉末轧制板材的影响。取小样在不同温度下进行真空无压烧结,研究了板坯的真空烧结行为。结果表明:Ti、Al元素粉末冷轧过程要求适中的粉末流动性、低的轧制速度以及一定大小且较稳定的轧制压力。真空烧结后,Ti Al合金由Ti Al和Ti3Al两相组成,Ti3Al相含量随烧结温度升高而增加。烧结坯孔隙度大幅度增加,增加量为21%32%。原板坯中的孔隙及偏扩散是造成烧结坯孔隙的主要原因。低压(<10kPa)真空烧结过程中,外压仅有效作用于短暂的液相阶段,粉末粒度越粗,烧结温度越高,烧结坯孔隙度受这种低压强的影响程度越大。 展开更多
关键词 ti—al合金 元素粉末 轧制 真空烧结 板材
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Ti44Al合金胞/枝晶转变及其生长过程的数值模拟 被引量:12
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作者 王狂飞 李邦盛 +2 位作者 米国发 郭景杰 傅恒志 《金属学报》 SCIE EI CAS CSCD 北大核心 2007年第2期211-216,共6页
采用基于溶质扩散控制模型CA方法对Ti44Al合金定向凝固初始阶段变速冷却过程中胞/枝晶转变过程进行了数值模拟.模拟结果表明,在胞/枝转变过程中,存在胞-枝混合生长区,在一些胞晶相邻面无二次枝晶生长.在给定的冷却速率下,枝晶臂间距... 采用基于溶质扩散控制模型CA方法对Ti44Al合金定向凝固初始阶段变速冷却过程中胞/枝晶转变过程进行了数值模拟.模拟结果表明,在胞/枝转变过程中,存在胞-枝混合生长区,在一些胞晶相邻面无二次枝晶生长.在给定的冷却速率下,枝晶臂间距大于胞晶臂间距;而在过渡区,枝晶间距达到最大.另外,晶核数量对柱状晶问距产生影响,随着植入晶核数量的增加,柱状晶间距非均匀化程度明显减小.出现过渡区的原因与枝晶生长所引起固/液界面前沿成分波动有关,模拟与实验结果吻合较好. 展开更多
关键词 ti—al合金 胞/枝晶转变 溶质扩散控制模型
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Ti-(44-50)Al合金定向包晶凝固过程中的组织演化 被引量:7
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作者 刘畅 苏彦庆 +3 位作者 李新中 郭景杰 贾均 傅恒志 《金属学报》 SCIE EI CAS CSCD 北大核心 2005年第3期260-266,共7页
利用TiAl二元系的热力学模型,计算了Ti-(44-50)Al(原子分数, %)合金包晶反应附近的相图,确定了初生相 β和包晶相α的固、液相线,得到了界面响应函数所需的部分参数.利用这些参数及单相合金凝固界面响应函数模型,计算了初 生相β和包... 利用TiAl二元系的热力学模型,计算了Ti-(44-50)Al(原子分数, %)合金包晶反应附近的相图,确定了初生相 β和包晶相α的固、液相线,得到了界面响应函数所需的部分参数.利用这些参数及单相合金凝固界面响应函数模型,计算了初 生相β和包晶相α的界面温度与生长条件变化的关系;结合最高界面生长温度判据.分析了Ti-(44-50)Al合金凝固过程中的 相选择和组织演化,并确定了Ti-Al合金稳态凝固时以成分和G/v为框架的相选择图. 展开更多
关键词 ti—al合金 包晶凝固 界面响应函数 组织选择
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定向凝固Ti-(44%—54%)Al合金的凝固相选择 被引量:5
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作者 李新中 孙涛 +4 位作者 于彩霞 苏彦庆 曹勇智 郭景杰 傅恒志 《金属学报》 SCIE EI CAS CSCD 北大核心 2009年第12期1479-1486,共8页
通过对Ti-(44%—54%)Al合金(原子分数)在较大的温度梯度与生长速率比值(G/v)范围内进行Bridgman定向凝固实验,研究了不同凝固条件下的固/液界面形态演化规律、包晶两相组织的形成规律及最终形成的片层结构的取向规律.采用充分形核假设... 通过对Ti-(44%—54%)Al合金(原子分数)在较大的温度梯度与生长速率比值(G/v)范围内进行Bridgman定向凝固实验,研究了不同凝固条件下的固/液界面形态演化规律、包晶两相组织的形成规律及最终形成的片层结构的取向规律.采用充分形核假设及成分过冷判据,计算了不同成分Ti-Al合金相与组织随凝固参数演化的相选择图,计算结果与实验结果符合较好. 展开更多
关键词 ti—al合金 定向凝固 相选择
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机械合金化Ti/Al合金的制备 被引量:10
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作者 刘鹤 周振华 +2 位作者 梁宝岩 金松哲 邹丽静 《粉末冶金工业》 CAS 北大核心 2005年第3期6-9,共4页
采用多维摆动式球磨机机械合金化Ti/Al二元粉末,研究了机械合金化过程中粉末结构的变化。Ti/Al混合粉末经高能球磨后,颗粒尺寸下降,Ti、Al晶粒各自逐渐细化至纳米级尺寸,且部分形成非晶,球磨15h后发现了TiAl和Ti3Al金属间化合物。将机... 采用多维摆动式球磨机机械合金化Ti/Al二元粉末,研究了机械合金化过程中粉末结构的变化。Ti/Al混合粉末经高能球磨后,颗粒尺寸下降,Ti、Al晶粒各自逐渐细化至纳米级尺寸,且部分形成非晶,球磨15h后发现了TiAl和Ti3Al金属间化合物。将机械合金化后的粉末进行放电等离子烧结,烧结试样的组成相主要为TiAl和Ti3Al。 展开更多
关键词 ti—al合金 机械合金 放电等离子烧结 金属间化合物
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Fcc结构Ti-Al合金的原子状态及其性质 被引量:1
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作者 余方新 谢佑卿 +3 位作者 聂耀庄 陶辉锦 李小波 彭红健 《中南工业大学学报》 CSCD 北大核心 2003年第6期598-602,共5页
在特征晶体模型基础上,引入特征原子的有效电荷概念,从第一原理出发利用特征晶体理论对Fcc结构Ti Al合金系的无序固溶体、TiAl金属间化合物电子结构和晶体性质进行研究.其过程为:首先采用中心原子团簇模型,用密度泛函理论的离散变分方... 在特征晶体模型基础上,引入特征原子的有效电荷概念,从第一原理出发利用特征晶体理论对Fcc结构Ti Al合金系的无序固溶体、TiAl金属间化合物电子结构和晶体性质进行研究.其过程为:首先采用中心原子团簇模型,用密度泛函理论的离散变分方法确定特征原子的有效电荷;然后用密度泛函理论的线性Muffin tin轨道法研究特征晶体的电子结构和性质;再根据特征晶体理论的叠加原理计算实际合金的性质,得到固溶体的平衡晶格常数、结合能、体弹性模量随成分变化的关系曲线.计算结果表明,金属间化合物TiAl的平均原子体积和结合能与实验数据一致. 展开更多
关键词 特征晶体模型 特征原子有效电荷 离散变分法 线性Muffin—tin轨道 ti—al合金
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Ti-Al合金精密铸件的疏松预测 被引量:2
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作者 潘丽梅 马颖澈 李殿中 《铸造》 CAS CSCD 北大核心 2004年第5期379-382,共4页
应用铸造软件ViewCast模拟精密铸造Ti 46%Al合金叶片的充型与凝固过程,预测了疏松的形成,模拟结果与实验结果相吻合。通过分析凝固温度场、凝固收缩百分数并结合实验结果,对原浇注系统进行改进:摒除了原先的顶注及顶、底联合浇注的方式... 应用铸造软件ViewCast模拟精密铸造Ti 46%Al合金叶片的充型与凝固过程,预测了疏松的形成,模拟结果与实验结果相吻合。通过分析凝固温度场、凝固收缩百分数并结合实验结果,对原浇注系统进行改进:摒除了原先的顶注及顶、底联合浇注的方式,只采用底注方式,有效克服了充型不平稳、易卷气的缺点;提高壳型预热温度、增大冒口尺寸,使铸件实现顺序凝固。改进后的模拟结果显示,铸件凝固顺序合理,疏松完全转移至凝固后的冒口中,保证了叶片的致密性。 展开更多
关键词 ti—al合金 精密铸造 计算机模拟 疏松
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Ti-Si-Al合金的显微组织与滑动摩擦学行为研究 被引量:3
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作者 湛永钟 喻正文 +3 位作者 孙赞 蒋积超 马建波 何林斌 《广西大学学报(自然科学版)》 CAS CSCD 2007年第3期296-299,共4页
研究了Al元素对Ti-Si共晶合金显微组织和滑动摩擦学行为的影响.结果表明,添加7.3%的Al改善了铸态合金的微观组织,形成了由近等轴状Ti5Si3颗粒增强α-Ti(Al,Si)固溶相的有利形态.Al的加入可同时提高合金的强度、硬度和塑性,从而有效抑制... 研究了Al元素对Ti-Si共晶合金显微组织和滑动摩擦学行为的影响.结果表明,添加7.3%的Al改善了铸态合金的微观组织,形成了由近等轴状Ti5Si3颗粒增强α-Ti(Al,Si)固溶相的有利形态.Al的加入可同时提高合金的强度、硬度和塑性,从而有效抑制了磨损亚表层裂纹的生长,在磨损表面产生了具有保护作用的机械混合层,从而显著地提高了合金的耐磨性和摩擦稳定性. 展开更多
关键词 ti—Si—al合金 显微结构 摩擦磨损
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氢对Ti-Al-Zr钛合金管材的组织和性能的影响
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作者 李远睿 何庆兵 韩靖 《重庆大学学报(自然科学版)》 EI CAS CSCD 北大核心 2003年第4期96-99,共4页
分析和试验了Ti -Al -Zr单相α -钛合金管材的化学成分、金相组织和室温机械性能后 ,采用人工吸氢法使该种钛合金材料获得了不同的氢含量。进而 ,测出了其延伸率随氢含量变化的关系曲线 ,从而认识到氢对该材料的塑性指标会造成显著的影... 分析和试验了Ti -Al -Zr单相α -钛合金管材的化学成分、金相组织和室温机械性能后 ,采用人工吸氢法使该种钛合金材料获得了不同的氢含量。进而 ,测出了其延伸率随氢含量变化的关系曲线 ,从而认识到氢对该材料的塑性指标会造成显著的影响。随后 ,用氢含量为 132× 10 -6、342× 10 -6和 80 8× 10 -6的 3种试样和它们的拉伸断口分别进行了金相和SEM分析。观察到了不同氢含量的样品中氢化物的金相形态及其分布特征 ;由对拉伸断口的分析工作 ,得出氢化物呈薄片状析出的特点 ,而惯析面为α相 (hcp结构 )的基面、近基面和其它易滑移面。最后 ,讨论了氢化物的种类、析出特征 。 展开更多
关键词 合金 管材 组织 性能 ti—al—Zr合金 塑性指标 拉伸断口分析 金相形态
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外加应力对Ti-25Al-10Nb合金显微组织几何特征的影响
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作者 郭巍 宗亚平 左良 《材料与冶金学报》 CAS 2007年第1期39-44,49,共7页
利用相场法显微组织模拟研究了外加应力对Ti-25Al-10Nb(摩尔分数/%)合金中α2→O相相变所产生显微组织几何特征的作用.结果表明,当外加应力达到390MPa时,就开始对O相析出形貌具有显著作用.外加应力改变O相析出形貌是因为:(1)外加应力使... 利用相场法显微组织模拟研究了外加应力对Ti-25Al-10Nb(摩尔分数/%)合金中α2→O相相变所产生显微组织几何特征的作用.结果表明,当外加应力达到390MPa时,就开始对O相析出形貌具有显著作用.外加应力改变O相析出形貌是因为:(1)外加应力使O相析出的总量增加,(2)外加应力诱发取向有利的O相变体析出并抑制其它O相变体的析出.外加应力大小对O相析出平均尺寸的影响可达106%,并且O相析出的尺寸标准差随外加应力增加而显著增大. 展开更多
关键词 ti—al—Nb合金 外加应力 显微组织 相场法 几何特征
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High temperature oxidation behavior of Ti(Al,Si)_3 diffusion coating on γ-TiAl by cold spray 被引量:5
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作者 王吉强 孔令艳 +1 位作者 李铁藩 熊天英 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第4期1155-1162,共8页
A Ti(Al,Si)3 diffusion coating was prepared on γ-TiAl alloy by cold sprayed Al?20Si alloy coating, followed by a heat-treatment. The isothermal and cyclic oxidation tests were conducted at 900 °C for 1000 h and ... A Ti(Al,Si)3 diffusion coating was prepared on γ-TiAl alloy by cold sprayed Al?20Si alloy coating, followed by a heat-treatment. The isothermal and cyclic oxidation tests were conducted at 900 °C for 1000 h and 120 cycles to check the oxidation resistance of the coating. The microstructure and phase transformation of the coating before and after the oxidation were studied by SEM, XRD and EPMA. The results indicate that the diffusion coating shows good oxidation resistance. The mass gain of the diffusion coating is only a quarter of that of bare alloy. After oxidation, the diffusion coating is degraded into three layers: an inner TiAl2 layer, a two-phase intermediate layer composed of a Ti(Al,Si)3 matrix and Si-rich precipitates, and a porous layer because of the inter-diffusion between the coating and substrate. 展开更多
关键词 ti(al Si)_3 diffusion coating γ-tial alloy cold spray heat-treatment high temperature oxidation
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Effect of Ti-Al content on microstructure and mechanical properties of C_f/Al and TiAl joint by laser ignited self-propagating high-temperature synthesis 被引量:5
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作者 冯广杰 李卓然 +1 位作者 冯士诚 申忠科 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第5期1468-1477,共10页
Cf/Al composites and TiAl alloys were joined by laser ignited self-propagating high-temperature synthesis(SHS) with Ni-Al-Ti interlayer. The effect of Ti-Al content on interfacial microstructure and mechanical prope... Cf/Al composites and TiAl alloys were joined by laser ignited self-propagating high-temperature synthesis(SHS) with Ni-Al-Ti interlayer. The effect of Ti-Al content on interfacial microstructure and mechanical properties of the joints was investigated. Localized melt of the substrates occurred in the joints. γ-Ni0.35Al0.30Ti0.35, NiA l3 and Ni2Al3 reaction layers formed adjacent to the substrates. Joint flaws, such as pores and cracks, made the joint density decrease and worked as the fracture source, which led to the sharp decline of joint strength. Additive Ti-Al increased joint density and strengthened the interlayer adhesion to Cf/Al. The joint flaws could be controlled by changing the Ti-Al content. When the Ti-Al content was 0.1, the joint was free of cracks with high density and reached the maximum shear strength of 24.12 MPa. 展开更多
关键词 Cf/al composite tial alloys JOINT self-propagating high-temperature synthesis INTERLAYER ti-al content
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Influence of forming process on three-dimensional morphology of TiB_2 particles in Al-Ti-B alloys 被引量:10
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作者 李鹏廷 李云国 +1 位作者 聂金凤 刘相法 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第3期564-570,共7页
A series of Al-Ti-B master alloys were prepared by different preparation routes,and the TiB2 particles in the master alloys were extracted and analyzed.It is found that the forming process has significant influence on... A series of Al-Ti-B master alloys were prepared by different preparation routes,and the TiB2 particles in the master alloys were extracted and analyzed.It is found that the forming process has significant influence on the three-dimensional morphology of TiB2 particles.Different preparation routes result in different reaction forms,which accounts for the morphology variation of TiB2 particles.When the Al-Ti-B master alloy is prepared using "halide salt" route,TiB2 particles exhibit hexagonal platelet morphology and are independent with each other.In addition,the reaction temperature almost does not have influence on the morphology of TiB2 particles.However,TiB2 particles exhibit different morphologies at different reaction temperatures when the master alloys are prepared with Al-3B and Ti sponge.When the master alloy is prepared at 850 ℃,a kind of TiB2 particle agglomeration forms with a size larger than 5 μm.The TiB2 particles change to layered stacking morphology even dendritic morphology with the reaction temperature reaching up to 1200 ℃. 展开更多
关键词 al-ti-B alloy tiB2 forming process three-dimensional morphology
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Multilayered Ti-Al intermetallic sheets fabricated by cold rolling and annealing of titanium and aluminum foils 被引量:14
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作者 孙彦波 赵业青 +3 位作者 张迪 刘翠云 刁浩岩 马朝利 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第8期1722-1727,共6页
Multilayered Ti-Al based intermetallic sheets were fabricated by sintering alternately layered titanium and aluminum foils.The microstructure and phase formation of the obtained sheets under different sintering condit... Multilayered Ti-Al based intermetallic sheets were fabricated by sintering alternately layered titanium and aluminum foils.The microstructure and phase formation of the obtained sheets under different sintering conditions were evaluated by various techniques.The results reveal that when the sintering temperature is above the melting point of aluminum,the self-propagating high-temperature synthesis reaction occurs between Ti and Al,and forms various phases of Ti-based solid solutions including α-Ti Ti3Al,TiAl,TiAl2 and α-Ti including TiAl3,etc.When the sintering time increased,Ti-based solid solution,TiAl2 and TiAl3 disappeared gradually,and the sheet containing Ti3Al and TiAl phases in a multilayered structure formed finally.A lot of voids were also observed in the sintered structures,which were caused by the melting Al,Kirkendall effect and the difference of molar volumes between reactants and products.The voids were eliminated and a dense sample was obtained by the following hot press. 展开更多
关键词 multilayered composites ti-al based intermetallics self-propagating high-temperature synthesis voids cold rolling ANNEalING
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Interface characteristic of friction stir welding lap joints of Ti/Al dissimilar alloys 被引量:12
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作者 陈玉华 倪泉 柯黎明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第2期299-304,共6页
Lap joints of TC1 Ti alloy and LF6 A1 alloy dissimilar materials were fabricated by friction stir welding and corresponding interface characteristics were investigated. Using the selected welding parameters, excellent... Lap joints of TC1 Ti alloy and LF6 A1 alloy dissimilar materials were fabricated by friction stir welding and corresponding interface characteristics were investigated. Using the selected welding parameters, excellent surface appearance forms, but the interface macrograph for each lap joint cross-section is different. With the increase of welding speed or the decrease of tool rotation rate, the amount of Ti alloy particles stirred into the stir zone by the force of tool pin decreases continuously. Moreover, the failure loads of the lap joints also decrease with increasing welding speed and the largest value is achieved at welding speed of 60 mm/min and tool rotation rate of 1500 r/min, where the interracial zone can be divided into 3 kinds of layers. The microhardness of the lap joint shows an uneven distribution and the maximum hardness of HV 502 is found in the middle of the stir zone. 展开更多
关键词 interface characteristic ti/A1 dissimilar alloys friction stir welding lap joint
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Effects of slurry pack cementation temperature on microstructure and wear resistance of Ti-Al co-deposited coating on copper plated nickel layer 被引量:2
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作者 王红星 张炎 +1 位作者 杨少锋 柳秉毅 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第2期449-454,共6页
In order to improve the wear resistance properties of copper substrate, a layer of electroplated nickel was firstly deposited on copper substrate, subsequently these electroplated specimens were treated by slurry pack... In order to improve the wear resistance properties of copper substrate, a layer of electroplated nickel was firstly deposited on copper substrate, subsequently these electroplated specimens were treated by slurry pack cementation process with a slurry pack cementation mixture composed of TiO2 as titanizing source, pure Al powder as aluminzing source and also a reducer for titanizing, an activator of NH4Cl and albumen (egg white) as cohesive agent. The Ti-Al coating was fabricated on the surface of electro-deposited nickel layer on copper matrix followed by the slurry pack cementation process. The effects of slurry pack cementation temperature on the microstructures and wear resistance of Ti-Al coating were studied. The results show that the microstructure of the coating changed from NiAl+Ni3(Ti,Al) to NiAl +Ni3(Ti,Al)+Ni4Ti3 to Ni4Ti3+NiAl, and to NiAl+Ni3(Ti,Al)+NiTi with slurry pack cementation temperature ranging from 800 ℃ to 950 ℃ in 12 h. The friction coefficient of Ti-Al coating decreased and the hardness increased with increasing the slurry pack cementation temperature. The minimum friction coefficient was 1/3 and the minimum hardness was 5 times larger than that of pure copper. 展开更多
关键词 ti-al coating Ni-ti intermetallic compound Ni-al intermetallic compound slurry pack cementation temperature wear resistance
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Microstructural evolution during homogenization of Al-Cu-Li-Mn-Zr-Ti alloy 被引量:17
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作者 李红英 苏雄杰 +1 位作者 尹浩 黄德胜 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第9期2543-2550,共8页
The microstructure evolution of Al-Cu-Li-Mn-Zr-Ti alloy during homogenization was investigated by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), and diff... The microstructure evolution of Al-Cu-Li-Mn-Zr-Ti alloy during homogenization was investigated by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), and differential scanning calorimeter (DSC) methods. The results show that severe dendritic segregation exists in the experimental alloy ingot. Numerous eutectic phases can be observed in the grain boundary, and the distribution of the main elements along the interdendritic region varies periodically. The main secondary phase is Al2Cu. The overburnt temperature of the alloy is 520 °C. The second phases are gradually dissolved into the matrix, and the grain boundaries become spare and thin during homogenization with increasing temperature or prolonging holding time. Homogenization can be described by a constitutive equation in exponential function. The suitable homogenization treatment for the alloy is (510 °C, 18 h), which agrees well with the results of homogenization kinetic analysis. 展开更多
关键词 al-Cu-Li-Mn-Zr-ti alloy HOMOGENIZAtiON microstructure kinetics
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Grain refining effect of Mg by novel particle cluster-containing Al-Ti-C master alloy 被引量:2
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作者 刘晓滕 郝海 +1 位作者 朱小旭 张兴国 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第6期1804-1810,共7页
A novel A1-Ti-C master alloy containing A14C3 and TiC particle clusters, which exhibits great refining potential for Mg, was prepared. With the addition of 2% A1-Ti-C master alloy, the grains transform to equiaxed cry... A novel A1-Ti-C master alloy containing A14C3 and TiC particle clusters, which exhibits great refining potential for Mg, was prepared. With the addition of 2% A1-Ti-C master alloy, the grains transform to equiaxed crystal with a diameter of (110-a:17) ~tm. The results indicate that A14C3 and TiC particle cluster, rather than a single particle, plays an important role in the refining process. Compared with the simplex smooth nucleating substrate, concave regions on the particle cluster provide easier route for the transformation from liquid Mg atoms to stable nucleus. Nucleus with a small size can also reach the critical nucleation radius when they attach on the concave regions of the substrate. A14C3 and TiC particle clusters thus become more favorable nucleating substrate for a-Mg grains. 展开更多
关键词 Mg A1-ti-C master alloy particle cluster grain refinement
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Mechanism of anti-arterial thrombosis of Dahuangzhecong Fang screened by Ti-Al intermetallic compound porous material 被引量:2
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作者 万玲 王战义 +6 位作者 魏星 李佶阳 钟广伟 段晓鹏 贺福元 江垚 王东生 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期3156-3160,共5页
The mechanism of antithrombotic of Dahuangzhechong Fang separated and purified by Ti-Al intermetallic compound porous material (TAICPM) was researched. Dahuangzhechong Fang, which was isolated and screened by TAICPM, ... The mechanism of antithrombotic of Dahuangzhechong Fang separated and purified by Ti-Al intermetallic compound porous material (TAICPM) was researched. Dahuangzhechong Fang, which was isolated and screened by TAICPM, was used to oral rats. At the end of study, their blood and thrombus were collected. The results show that TAICPM with the pore size of 1-5 μm can screen Dahuangzhechong Fang well. Dahuangzhechong Fang can increase 6-keto-PGF1α, lower content of TXD2 and platelet. Dahuangzhechong Fang has good effect to resist arterial thrombosis. 展开更多
关键词 ti-al intermetallic compound porous materials Dahuangzhecong Fang arterial thrombosis isolated Chinese medicine
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Dynamic response and numerical simulation of Al-Sc and Al-Ti alloys under high-speed impact
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作者 张伟贵 何良菊 +3 位作者 李培杰 叶益聪 冯雪 L.S.NOVIKOV 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第2期559-570,共12页
Al-Sc and Al-Ti semi-infinite targets were impacted by high-speed projectiles at velocities of 0.8, 1.0, 1.2 and 1.5 km/s, respectively. It is found that the Al-Sc targets demonstrate more excellent ability to resist ... Al-Sc and Al-Ti semi-infinite targets were impacted by high-speed projectiles at velocities of 0.8, 1.0, 1.2 and 1.5 km/s, respectively. It is found that the Al-Sc targets demonstrate more excellent ability to resist high-speed impact. It is concluded that different microstructures of Al-Sc and Al-Ti alloys, including different grain sizes and secondary particles precipitated in the matrix, result in their greatly different capabilities of resisting impact. Furthermore, the effect of the size range ofnanoscale A13Sc precipitate in A1-Sc alloy on the resistance of high-speed impact was investigated. In addition, computer simulations and validation of these simulations were developed which fairly accurately represented residual crater shapes/geometries. Validated computer simulations allowed representative extrapolations of impact craters well beyond the laboratory where melt and solidification occurred at the crater wall, especially for hypervelocity impact (〉5 km/s). 展开更多
关键词 al-Sc alloy al-ti alloy al3SC high-speed impact dynamic response numerical simulation
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