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金属材料微观组织结构演化的相场法研究
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作者 于芯悦 《南方农机》 2018年第11期156-156,共1页
金属材料是目前应用最广泛的材料之一,对微观组织结构演化进行分析,是金属材料性能研究的重要内容。本文首先介绍一种金属材料微观组织结构演化分析方法,即相场法,包括应用要点和应用流程等。探讨分析了相场法在金属材料微观组织结构演... 金属材料是目前应用最广泛的材料之一,对微观组织结构演化进行分析,是金属材料性能研究的重要内容。本文首先介绍一种金属材料微观组织结构演化分析方法,即相场法,包括应用要点和应用流程等。探讨分析了相场法在金属材料微观组织结构演化中的具体应用,包括微观结构特征分析,凝固过程分析,再结晶过程分析,晶粒长大过程和固态相变过程分析等,供有关人员参考。 展开更多
关键词 金属材料 微观组织结构演化 相场法
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拉拔变形量对Al-Mg-Si合金线微观组织和强度的影响 被引量:2
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作者 李周选 陈庆吟 +4 位作者 侯嘉鹏 王强 高义波 徐爱民 张哲峰 《材料热处理学报》 EI CAS CSCD 北大核心 2021年第1期75-82,共8页
研究了Al-Mg-Si合金线的强度和微观组织结构与拉拔变形量的关系,分析了Al-Mg-Si合金线的强化机制。结果表明:Al-Mg-Si合金线强度随变形量的增大呈现两阶段特征,第一阶段为变形量小于55.3%时,Al-Mg-Si合金线强度随着变形量的增大而缓慢增... 研究了Al-Mg-Si合金线的强度和微观组织结构与拉拔变形量的关系,分析了Al-Mg-Si合金线的强化机制。结果表明:Al-Mg-Si合金线强度随变形量的增大呈现两阶段特征,第一阶段为变形量小于55.3%时,Al-Mg-Si合金线强度随着变形量的增大而缓慢增加,第二阶段为变形量超过55.3%时,Al-Mg-Si合金线强度随着变形量的增大大幅增加;随着拉拔变形量增大,Al-Mg-Si合金线内位错密度逐渐增大,横截面<001>织构逐渐向<111>织构转变,变形初期Al-Mg-Si合金线内存在大量的小角度晶界,变形后期小角度晶界逐渐演化为大角度晶界;Al-Mg-Si合金线强度随变形量的增大而增加的机制为位错强化、织构强化和细晶强化,导致Al-Mg-Si合金线强度与变形量呈现两阶段关系的原因是不同取向差晶界的强化作用差异。 展开更多
关键词 铝镁硅合金线 拉拔 强度 微观组织结构演化
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Microstructural evolution during partial remelting of AM60B magnesium alloy refined by MgCO_3 被引量:4
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作者 陈体军 马颖 +2 位作者 王瑞全 李元东 郝远 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第9期1615-1621,共7页
AM60B magnesium alloy was refined by MgCO3 and its microstmcturat evolution was investigated during partial remelting. The results indicate that MgCO3 is an effective grain refiner for AM60B alloy and can decrease the... AM60B magnesium alloy was refined by MgCO3 and its microstmcturat evolution was investigated during partial remelting. The results indicate that MgCO3 is an effective grain refiner for AM60B alloy and can decrease the grain size from 329 pm of the unrefined alloy to 69 μm. A semisolid microstructure with small and spheroidal primary particles can be obtained after being partially remelted. The microstructure evolution can be divided into four steps: the initial rapid coarsening, structure separation, spheroidization and final coarsening. Correspondingly, these four steps result from the phase transformations of β→α, α+β→L and α→L, α→L and two reverse reactions of α→L and L→α, respectively. One spheroidal primary particle in the semisolid microstmcture usually originates one dendrite in the as-cast microstructure. The variation of primary particle size with holding time does not obey the LSW law, Dt^3-Do^3=Kt, after the semisolid system is in its solid-liquid equilibrium state. Longer heating duration makes the primary particles more globular, but it makes their size larger at the same time. 展开更多
关键词 AM60B alloy THIXOFORMING microstructure evolution phase transformation partial remelting
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Microstructure evolution of 7050 aluminum alloy during hot deformation 被引量:17
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作者 李俊鹏 沈健 +2 位作者 闫晓东 毛柏平 闫亮明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第2期189-194,共6页
Hot compression of 7050 aluminum alloy was performed on Gleeble 1500D thermo-mechanical simulator at 350 ℃ and 450 ℃ with a constant strain rate of 0.1 s-1 to different nominal strains of 0.1, 0.3 and 0.7. Microstru... Hot compression of 7050 aluminum alloy was performed on Gleeble 1500D thermo-mechanical simulator at 350 ℃ and 450 ℃ with a constant strain rate of 0.1 s-1 to different nominal strains of 0.1, 0.3 and 0.7. Microstructures of 7050 alloy under various compression conditions were observed by TEM to investigate the microstructure evolution process of the alloy deformed at various temperatures. The microstructure evolves from dislocation tangles to cell structure and subgrain structure when being deformed at 350 ℃, of which dynamic recovery is the softening mechanism. However, continuous dynamic recrystallization (DRX) occurs during hot deformation at 450 ℃, in which the main nucleation mechanisms of DRX are subgrain growth and subgrain coalescence rather than particle-simulated nucleation (PSN). 展开更多
关键词 microstructure evolution dynamic recovery dynamic recrystallization hot deformation 7050 alloy
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TiAl合金表面阴极微弧沉积Al2O3陶瓷涂层的生长过程与相组成 被引量:2
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作者 王少青 谢发勤 +2 位作者 吴向清 陈连阳 周恺 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2019年第12期3883-3888,共6页
利用阴极微弧沉积技术在预处理后的TiAl合金表面制备了Al2O3陶瓷涂层,研究了涂层的生长过程和相组成。采用扫描电子电镜(SEM、EDS)、透射电子电镜(TEM)、X射线衍射(XRD)等方法,对Al2O3涂层的生长过程中的微观形貌、组织成分以及晶体结... 利用阴极微弧沉积技术在预处理后的TiAl合金表面制备了Al2O3陶瓷涂层,研究了涂层的生长过程和相组成。采用扫描电子电镜(SEM、EDS)、透射电子电镜(TEM)、X射线衍射(XRD)等方法,对Al2O3涂层的生长过程中的微观形貌、组织成分以及晶体结构的演变进行了研究与分析。结果表明,TiAl合金表面阴极微弧沉积过程中,在阴极表面发生非晶态Al(OH)3的吸附、脱水烧结形成Al2O3陶瓷涂层的沉积。Al2O3涂层生长分前期I、中期II和后期III 3个阶段,前期起弧阻挡层被击穿,涂层生长较慢、组织致密且与基体结合良好;反应中期涂层生长较快,Al(OH)3不断吸附和脱水烧结,涂层结晶度提高;反应后期涂层生长速度变缓,表层组织疏松、多孔,相组成为87.5%的α-Al2O3和12.5%的γ-Al2O3。 展开更多
关键词 阴极微弧沉积 TIAL合金 微观组织结构演化 结晶度
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Numerical simulation of microstructure evolution during directional solidification process in directional solidified (DS) turbine blades 被引量:7
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作者 ZHANG Hang XU QingYan +2 位作者 TANG Ning PAN Dong LIU BaiCheng 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第12期3191-3202,共12页
Directional solidified(DS) turbine blades are widely used in advanced gas turbine engine. The size and orientation of columnar grains have great influence on the high temperature property and performance of the turbin... Directional solidified(DS) turbine blades are widely used in advanced gas turbine engine. The size and orientation of columnar grains have great influence on the high temperature property and performance of the turbine blade. Numerical simulation of the directional solidification process is an effective way to investigate the grain's growth and morphology,and hence to optimize the process. In this paper,a mathematical model was presented to study the directional solidified microstructures at different withdrawal rates. Ray-tracing method was applied to calculate the temperature variation of the blade. By using a Modified Cellular Automation(MCA) method and a simple linear interpolation method,the mushy zone and the microstructure evolution were studied in detail. Experimental validations were carried out at different withdrawal rates. The calculated cooling curves and microstructure agreed well with those experimental. It is indicated that the withdrawal rate affects the temperature distribution and growth rate of the grain directly,which determines the final size and morphology of the columnar grain. A moderate withdrawal rate can lead to high quality DS turbine blades for industrial application. 展开更多
关键词 directional solidified (DS) turbine blade Cellular Automation (CA) numerical modeling and simulation
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