铝单晶扭转变形行为及静态再结晶机理  

Torsional Deformation and Static Recrystallization Behavior of Aluminum Single Crystal

作　　者：付永杰 陈宇强 陆丁丁 宋宇峰 FU Yongjie;CHEN Yuqiang;LU Dingding;SONG Yufeng(School of Materials Science and Engineering,Hunan University of Science and Technology,Xiangtan 411100,China)

机构地区：[1]湖南科技大学材料科学与工程学院,湖南湘潭411100

出　　处：《有色金属工程》2024年第7期33-42,共10页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(52075166,U21A20130);湖南省自然科学基金(2023JJ10019);中国博士后科学基金(2022M712642)。

摘　　要：对〈123〉取向铝单晶进行了不同应变量下常温单向扭转变形及后续退火处理,利用电子背散射衍射(EBSD)技术对退火前后试样进行了表征,分析了铝单晶不同应变量与退火条件下微观组织演变与静态再结晶行为。结果表明:铝单晶常温扭转变形过程中发生晶格旋转,其形变基体内部由平行于活化滑移平面{111}的变形微带组成。位错在扭转变形中形成并通过相互作用而导致位错堆积,从而诱发铝单晶晶格旋转和取向散射。退火温度为500℃时,晶界迁移速率增加,形变铝单晶中取向差在20°~45°高能晶界的二次再结晶晶粒优先生长,导致其晶粒尺寸持续增长至1 mm左右。随着应变量和退火温度的增加,再结晶晶粒由相邻形变基体围绕〈111〉、〈123〉和〈122〉方向旋转20°~60°形核产生,30°~50°〈111〉型取向关系逐渐占据主导地位。In this paper,〈123〉-oriented aluminum single crystals were deformed by unidirectional torsion followed by annealing treatment.The microstructure evolution and static recrystallization behavior of aluminum single crystal samples after annealing were characterized by electron backscatter diffraction(EBSD).The results show that the lattice rotation occurs in the aluminum single crystal,and the deformed matrix was composed of microbands(MBs)parallel to the active slip plane{111}during torsional deformation at room temperature.The mutual absorption of dislocations promotes the dislocation accumulation,which results in the lattice rotation and orientation scattering of the deformed aluminum single crystals.When the annealing temperature is 500℃,the nucleation and growth of the secondary recrystallization grains significantly increase due to the accelerated grain boundary migration rate.The preferential growth of the secondary recrystallization grains with misorientation of 20°—45°high-energy grain boundaries,resulting in a continuous growth of the grain size to about 1 mm.The nucleation of recrystallizations was rotated 20°—60°around the〈111〉,〈123〉and〈122〉directions by adjacent deformed matrix,and the 30°-50°〈111〉orientation relationship gradually dominates with the increasing of strain and annealing temperature.

关 键 词：铝单晶 扭转变形 退火处理 静态再结晶 取向关系 

分 类 号：TG146.2[一般工业技术—材料科学与工程]