弥散强化6XXX铝合金热变形行为研究  

Hot Deformation Behavior of Dispersion Strengthened 6XXX Al Alloy

作　　者：王孝国 张孝元 孙瑞娟[1] 王斌[1] 王嘉伟[1] Wang Xiaoguo;Zhang Xiaoyuan;Sun Ruijuan;Wang Bin;Wang Jiawei(College of Agricultural Engineering,Shanxi Agricultural University;Department of Mechanical and Electrical,Jinzhong College of Information)

机构地区：[1]山西农业大学农业工程学院,山西晋中030800 [2]晋中信息学院机电工程系

出　　处：《特种铸造及有色合金》2021年第9期1114-1118,共5页Special Casting & Nonferrous Alloys

基　　金：山西省优秀博士来晋工作奖励资金科研项目(SXBYKY2021021);山西农业大学博士科研启动项目(2020BQ80)。

摘　　要：对均匀化态含Mn/Cr弥散强化6XXX铝合金(WQ合金)在不同变形温度和应变速率下进行轴向热压缩试验。应用双曲正弦本构方程求得合金材料参数和激活能;基于动态材料模型获得变形合金热加工图;根据热加工图确定安全加工窗口,优化变形参数;WQ合金安全加工区域动态软化机制主要为动态回复,亚晶旋转和(亚)晶界迁移受阻于α弥散相;加工失稳区微观组织存在裂纹,主要与微孔形成和第二相开裂、脱相有关。The hot deformation behaviors of homogenized Mn/Cr-containing aluminum alloys denoted as WQ were investigated systematically by uniaxial compression tests at various deformation temperature and strain rates. The hyperbolic-sine constitutive equation was employed to determine the parameters and activation energies of materials. Based on dynamic material model, the processing maps of WQ alloys were also constructed to reveal safe processing domain and optimize deformation parameters. Attributed to pinning effect of α-Al(MnCr)Si dispersoids, sub-grain rotation and sub-grain boundaries migration are suppressed. Hence, the softening mechanism in WQ alloy is dominated by dynamic recovery at safe processing domain. Cracks are observed in the microstructure of the machining instability zone, which is related to micro void formation, cracks and debonding of the second phase.

关 键 词：6XXX铝合金 热变形 本构分析 热加工图 α弥散相 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.26[金属学及工艺—金属材料]