Stabilization of hexagonal Cu6(Sn,Zn)5 by minor Zn doping of Sn-based solder joints

被引:59
作者
Yu, Chi-Yang [1 ]
Duh, Jenq-Gong [1 ]
机构
[1] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu, Taiwan
关键词
Intermetallic compound; Solder; Thermal stability; Phase transformation; CU TERNARY-SYSTEM; PB-FREE SOLDERS; ORIENTATION RELATIONSHIPS; INTERFACIAL REACTIONS; PHASE-STABILITY; CU6SN5; NI; ALLOYS;
D O I
10.1016/j.scriptamat.2011.07.029
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Cu6Sn5 is the dominant intermetallic compound at the Sn/Cu joint interface. The crystal structure of Cu6Sn5 varies with temperature. After reflow at 250 degrees C, interfacial Cu6Sn5 revealed a hexagonal structure (eta-Cu6Sn5). During aging at 150 degrees C, hexagonal eta-Cu6Sn5 transforms into monoclinic eta'-Cu6Sn5. X-ray diffraction and differential scanning calorimetry analyses show that doping small amounts of Zn (0.8-2.1 at.%) into Cu-6(Sn,Zn)(5) can stabilize the hexagonal structure during the thermal aging process. Thermodynamic calculation also demonstrates that Zn stabilizes the hexagonal Cu-6(Sn,Zn)(5). Crown Copyright (C) 2011 Published by Elsevier Ltd. on behalf of Acta Materialia Inc. All rights reserved.
引用
收藏
页码:783 / 786
页数:4
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