Hot deformation behavior and related microstructure evolution in Au−Sn eutectic multilayers  

Au−Sn共晶多层材料的热变形行为及组织演化

作　　者：Yong MAO Dan-li ZHU Jun-jie HE Chao DENG Ying-jie SUN Guang-jie XUE Heng-fei YU Chen WANG 毛勇;祝丹丽;何俊杰;邓超;孙莹洁;薛广杰;余恒飞;王琛(云南大学材料与能源学院,昆明650091;云南大学物理与天文学院,昆明650091;云南大学材料基因工程研究中心,昆明650091;重庆大学材料科学与工程学院,重庆400045)

机构地区：[1]School of Materials and Energy,Yunnan University,Kunming 650091,China [2]School of Physics and Astronomy,Yunnan University,Kunming 650091,China [3]Materials Genome Institute,Yunnan University,Kunming 650091,China [4]College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第6期1700-1716,共17页中国有色金属学报（英文版）

基　　金：financial supports from the National Natural Science Foundation of China(Nos.U1502272,51901204);the Precious Metal Materials Genome Engineering in Yunnan Province,China(Nos.2019ZE001,202002AB080001)。

摘　　要：Hot compression was performed on a multilayered Au−20Sn eutectic alloy to investigate the deformation behavior and microstructure evolution.During hot compression,microstructural spheroidization was initiated from plastic instability regions,and it was preferentially activated in vertical lamellae with a growth direction parallel to the compressive direction.Continuous dynamic recrystallization associated with lattice dislocations was the mechanism in both AuSn and Au5Sn multilayers.After spheroidization,strain accumulations were weakened in both of the equiaxed phases,and the deformation mechanism was substantially replaced by grain boundary sliding and migration.Based on these findings,hot rolling was conducted on an as-cast Au−20Sn alloy and a foil with a thickness of~50μm was successfully prepared.The present study can promote the development of Au−20Sn foils,and provide insights into the deformation behavior and microstructure evolution of multilayered eutectic alloys.研究多层组织Au−20Sn共晶合金在热压缩过程中的变形行为及组织演变。结果表明,合金层状组织在热变形中发生塑性失稳,球化行为会在失稳区域启动并逐步在层片团内蔓延。组织球化优先发生于层片生长方向与压缩方向平行的层片团内部,其球化机制为AuSn/Au5Sn层片内部位错演化牵动的不连续动态再结晶。球化完成后,两等轴相内部的应变积累能力均弱化,变形机制由位错滑移转变为晶界滑动和迁移。基于上述研究,设计Au−20Sn铸态合金的热轧成形实验,并成功制备出厚度为~50μm的箔材。本研究不仅能促进Au−20Sn箔材钎料的发展应用,也将为多层组织合金的变形及组织演变提供理论参考。

关 键 词：Au−20Sn eutectic alloy INTERMETALLICS hot compression multilayered structure deformation SPHEROIDIZATION 

分 类 号：TG113[金属学及工艺—物理冶金]