晶体取向对铝单晶的高温流变行为影响  

Effect of Crystal Orientation on High Temperature Rheological Behavior of Aluminum Single Crystal

作　　者：李佳[1] 陈宇强[1] 熊雯雯[2] 王臻 徐加贝 巫海亮 黄磊 曾立英 LI Jia;CHEN Yuqiang;XIONG Wenwen;WANG Zhen;XU Jiabei;WU Hailiang;HUANG Lei;ZENG Liying(Hunan Engineering Research Center for Forming Technology and Damage Resistance Evaluation of High-Efficiency Light Alloy Components,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Institute of Science and Technology Information,Changsha 410001,China;Xiangtan City Industrial and Mining Electric Transmission Vehicle Quality Inspection Center,Xiangtan 411199,China)

机构地区：[1]湖南科技大学高功效轻合金构件成形技术及耐损伤性能评价湖南省工程研究中心,湖南湘潭411201 [2]湖南省科学技术信息研究所,长沙410001 [3]湘潭市工矿电传动车辆质量检验中心,湖南湘潭411199

出　　处：《有色金属工程》2024年第8期17-30,共14页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(52075166,U21A20130);湖南省杰出青年基金(2023JJ10019)。

摘　　要：采用Cube、Copper、S三种取向铝单晶(ASCs)在25~300℃、0.001~10 s-1条件下进行热模拟等温单轴压缩实验,获得三种取向ASCs在不同高温变形条件下的真应力-真应变曲线,建立其应变补偿高温变形本构方程以及热加工图。结果表明:不同晶体取向的ASCs的动态再结晶(DRX)程度存在显著差异,三种取向ASCs的DRX难度为:Cube>Copper>S。ASCs在等温单轴压缩过程中的流变应力随应变速率的减小与变形温度的升高而降低,各取向的最高流变应力水平为:Copper>S>Cube。各取向ASCs在变形过程中的微观组织演化耗能存在差异,其功率耗散率数值的大小顺序为:Cube>Copper>S。Thermal simulation isothermal uniaxial compression experiments were carried out with Cube,Copper and S oriented aluminum single crystal(ASCs)at 25~300℃ and 0.001~10 s^(-1).The true stress-true strain curves of ASCs under different high temperature deformation conditions were obtained,and the strain compensation constitutive equation and thermal processing diagram were established.The results show that the degree of dynamic recrystallization(DRX)of ASCs with different crystal orientations is significantly different.The DRX difficulty of ASCs with three orientations is as follows:Cube>Copper>S.The flow stress of ASCs during isothermal uniaxial compression decreases with the decrease of strain rate and the increase of deformation temperature.The maximum flow stress level of each orientation is Copper>S>Cube.The microstructure evolution energy dissipation of ASCs with different orientations during deformation is different,and the order of the power dissipation rate is Cube>Copper>S.

关 键 词：晶体取向 铝单晶 高温流变行为 本构方程 热加工图 

分 类 号：TG146.21[一般工业技术—材料科学与工程]