TA1/AZ31B多层复合材料在等温压缩过程中的变形行为  

Deformation Behavior of TA1/AZ31B Multi-layer Composites During Isothermal Compression Processing

作　　者：张兵[1,3,4] 姚苏 王秋雨 李娟 张东 赵田丽 王文[2,3] 蔡军 王快社[2,3] Zhang Bing;Yao Su;Wang Qiuyu;Li Juan;Zhang Dong;Zhao Tianli;Wang Wen;Cai Jun;Wang Kuaishe(Xi'an University of Architecture and Technology,Xi'an 710055,China;State Key Laboratory of Nickel and Cobalt Resource Integrated Utilization,Jinchuan Group Co.,Ltd,Jinchang 737100,China;National&Local Engineering Researching Center for Functional Materials Processing,Xi'an 710055,China;College of Metallurgy Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]西安建筑科技大学,陕西西安710055 [3]金川集团有限公司,镍钴资源综合利用国家重点实验室,甘肃金昌737100 [4]功能材料加工国家地方联合工程研究中心,陕西西安710055

出　　处：《稀有金属材料与工程》2020年第6期1946-1956,共11页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51874226);State Key Laboratory of Nickel and Cobalt Resource Integrated Utilization(301170504);Xi’an Science and Technology Planning Project(201805033YD11CG17(8));Xi’an University of Architecture&Technology(JC1507)。

摘　　要：采用等温压缩实验研究了在变形温度为573~723 K,应变速率范围为0.01~10 s-1,压下量30%~50%的条件下TA1/AZ31B多层复合材料的塑性变形行为并利用光学显微镜观察显微组织的变化。研究表明:TA1和AZ31B在压缩复合过程中均发生塑性变形,但是钛/镁多层复合材料各层的变形不同时且不均匀,AZ31B层的变形程度大于TA1层,且在变形过程中AZ31B层发生了动态再结晶。当应变速率为10 s-1时,中间TA1层出现颈缩和断裂。计算结果证明,Arrhenius本构方程可以准确预测TA1/AZ31B多层复合材料的流动应力行为,其平均绝对相对误差为3.976%,相关系数为0.991。此外,基于动态材料模型(DMM)理论建立了TA1/AZ31B多层复合材料在真应变为0.5下的加工图,确定最佳加工条件为723 K温度下,应变速率为0.01 s-1,此时最大功率耗散值为28%。同时,TA1/AZ31B多层复合材料的加工图中存在一个不稳定区域,即变形温度范围为573~692 K时应变速率范围为0.6~10 s-1。Isothermal compression experiments were performed to investigate the hot deformation behavior of TA1/AZ31B multi-layer composites.Flow stress-strain curves were obtained for deformation at temperatures from 573 K to 723 K within the strain rate range from 0.01 s-1 to 10 s-1,and the height reduction range from 30%to 50%.The results show that both TA1 and AZ31B have plastic deformation during the compression bonding process.However,all layers’deformation of TA1/AZ31B multi-layer composite does not occur at the same time and is not uniform.The deformation of AZ31B is larger than that of TA1,and dynamic recrystallization of AZ31B occurs during the deformation process.When the strain rate is 10 s-1,necking and fracture occurs in the middle TA1 layer.Based on the flow stress-strain curves,the Arrhenius-type constitutive equation could precisely predict the flow stress behavior of TA1/AZ31B multi-layer composite.The value of the correlation coefficient is 0.991 when the average absolute relative error is 3.976%.The processing map at true strain of 0.5 for TA1/AZ31B multi-layer composite was developed using the dynamic materials model(DMM)theory.The processing map of isothermally compressed TA1/AZ31B multi-layer composite exhibits that the optimum parameters are the temperature of 723 K and the strain rate of 0.01 s-1 with power dissipation’s maximum efficiency of 28%.In the meanwhile,there is one instability domain in the processing map of isothermally compressed TA1/AZ31B multi-layer composite;it is in the deformation temperature range from 573 K to 692 K and the strain rate range from 0.6 s-1 to 10 s-1.

关 键 词：TA1/AZ31B多层复合材料 等温压缩 变形行为 本构方程 加工图 

分 类 号：TB331[一般工业技术—材料科学与工程]