基于粘塑性自洽模型的纯铝板材屈服特征研究  

Yield Characterization of Pure Aluminum Sheet via Viscous-plasticity Self-consistent Model

作　　者：周中波 李若琳 杨明波[1] 张建中 ZHOU Zhongbo;LI Ruolin;YANG Mingbo;ZHANG Jianzhong(School of Materials Science and Engineering,Chongqing University of Technology,Chongqing 400054;School of Materials Engineering,Jiangsu University of Technology,Changzhou 213001;Chongqing Sannai Technology Co.,Ltd.,Chongqing 401135)

机构地区：[1]重庆理工大学材料科学与工程学院,重庆400054 [2]江苏理工学院材料工程学院,常州213001 [3]重庆三耐科技有限责任公司,重庆401135

出　　处：《特种铸造及有色合金》2025年第1期80-84,共5页Special Casting & Nonferrous Alloys

摘　　要：针对工业纯铝板材织构显著、各向异性明显,以至屈服行为尤其是后继屈服行为复杂、难以通过试验理清的问题,采用粘塑性自洽模型对退火薄板的屈服轨迹演变进行了分析。首先研究了实际板材的显微组织和晶体学取向,并进行拉伸试验以揭示其应变硬化特征,在此基础上建立了能够准确描述纯铝板材大变形行为的粘塑性自洽模型。然后利用模型进行了虚拟双向变形试验,预测了纯铝屈服轨迹的演变规律。结果表明,受织构的影响,纯铝板材的初始屈服轨迹呈现出典型的多边形而非椭圆形;随着变形量的提高,材料不仅出现了显著的拉压不对称性,而且后继屈服轨迹的多边形化现象更加显著,某些应变路径下甚至变为内凹状。这表明传统的屈服准则和流动理论难以描述纯铝的大变形过程,需进一步改善。In view of the significant texture and anisotropy of industrial pure aluminum sheet leading to complicated subsequent yield behavior,which is difficult to clarify,the viscous-plasticity self-consistent(VPSC)method was applied to analyze the yield loci of as-annealed aluminum sheet.The microstructure and crystalline orientations were characterized,and the plastic hardening behavior was revealed by tensile tests.On this basis,VPSC model that can accurately describe large deformation behavior of aluminum sheet was established.Subsequently,virtual mechanical tests were performed to predict the evolution law of yield loci.The results reveal that the initial yield loci exhibits a typi⁃cal polygon shape rather than elliptical owing to the presence of crystal texture.With increasing in deformation,signifi⁃cant tension asymmetry occurs,and subsequent yield loci is polygonization,which even become concave under certain strain-paths.Therefore,the traditional yield criteria as well as the plastic flow theories is incapable of describing large deformation of aluminum,and further modifications are required.

关 键 词：工业纯铝 各向异性 屈服轨迹 粘塑性自洽模型 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TP311[金属学及工艺—金属材料]