Morphologies of intermetallic compound phases in Sn-Cu and Sn-Co peritectic alloys during directional solidification  

作　　者：Peng Peng Jin-mian Yue An-qiao Zhang Jia-tai Wang Jiang-lei Fan 

机构地区：[1]School of Physics and Electronic Information Engineering,Qinghai Normal University,Xining 753000,China [2]School of Materials and Energy,Lanzhou University,Lanzhou 730000,China [3]Northwest Rare Metal Materials Research Institute,Shizuishan 753099,Ningxia,China [4]Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,China [5]School of Mechanical and Electrical Engineering,Zhengzhou University of Light Industry,Zhengzhou 450000,China

出　　处：《China Foundry》2022年第5期411-418,共8页中国铸造（英文版）

基　　金：the support of the National Natural Science Foundation of China (Grant No. 51871118);the Fast Support Project (Grant No. JZX7Y20210162400301);the fund of State Key Laboratory of Special Rare Metal Materials (Grant No. SKL2020K003)

摘　　要：The morphologies of intermetallic phases(IMCs)during directional solidification of the Sn-Cu(L+Cu_(3)Sn→Cu_(6)Sn_(5))and Sn-Co(L+CoSn→CoSn_(2))peritectic systems were analyzed.The primary Cu_(3)Sn and peritectic Cu_(6)Sn_(5)phases in Sn-Cu alloy are IMCs whose solubility ranges are narrow,while both the primary CoSn and peritectic CoSn_(2)phases in Sn-Co alloy are IMCs whose solubility ranges are nil in equilibrium condition.The experimental results before acid corrosion shows that the dendritic morphology of both the Cu_(6)Sn_(5)and CoSn_(2)phases can be observed.The investigation on the local dendritic morphology after deep acid corrosion shows that these dendrites are composed of small sub-structures with faceted feature.Faceted growth of the primary Cu_(3)Sn and CoSn phases is also confirmed,and a faceted to non-faceted transition in their morphologies is observed with increasing growth velocities.Further analysis shows that the dendritic morphology is formed in the solidified phases whose solubility range is larger during peritectic solidification.

关 键 词：intermetallic compound phase peritectic alloy directional solidification solubility range sub-structure 

分 类 号：TG146.14[一般工业技术—材料科学与工程]