Impact toughness, hardness and shear strength of Fe and Bi added Sn-1Ag-0.5Cu lead-free solders
Impact toughness, hardness and shear strength of Fe and Bi added Sn-1Ag-0.5Cu lead-free solders
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DOI：
10.1016/j.microrel.2016.05.004
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发表时间：
2016-08-01
影响因子：
1.6
通讯作者：
Sukiman, Nazatul Liana
中科院分区：
文献类型：
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作者：
Ali, Bakhtiar;Sabri, Mohd Faizul Mohd;Sukiman, Nazatul Liana
本文研究了新型含Fe/Bi系Sn1Ag-0.5Cu(SAC105)焊料的力学性能，包括冲击韧性、硬度和剪切强度。采用冲击速度为5.4m/S的夏比冲击试验机，测定冲击试验过程中的冲击吸收能。在SAC105合金中加入0.05wt.%Fe和1wt.%的铋，冲击吸收能从8.1J提高到9.7J，提高了约20%，而增加合金中的铋含量并没有进一步提高冲击吸收功。在载荷为245.2 mN、载荷保持时间为10 S的条件下进行了维氏硬度试验，Fe/B i的加入使合金的硬度从10.5HV提高到22.6HV，提高了一倍以上。剪切试验以0.25 mm/min的剪切速度进行。添加SAC105的Fe/Bi合金的剪切强度几乎是基合金的两倍，从17.8 Mpa提高到343 Mpa。显微组织研究表明，铋固溶于焊料块体中，以固溶强化机制强化焊料合金。交叉偏光显微镜观察表明，在SAC105中加入Fe/Bi后，β-锡的晶粒度从60-100微米显著减小到20-40微米。场发射扫描电子显微镜(FESEM)背散射电子显微镜(FESEM)照片和ImageJ软件的进一步分析表明，在SAC105中添加Fe/Bi显著减小了Ag3Sn5和Cu6Sn5金属间化合物的尺寸，细化了组织。添加了SAC105的Fe/Bi合金的组织结构发生了这些变化，从而导致了力学性能的改善。(C)2016爱思唯尔有限公司。保留所有权利。
In this study, the new Fe/Bi-bearing Sn-1Ag-0.5Cu (SAC105) solder alloys were studied for their mechanical properties, including impact toughness, hardness and shear strength. Charpy impact tester with impact speed of 5.4 m/s was used to determine the impact absorbed energy during impact tests. With the 0.05 wt.% Fe and 1 wt.% Bi addition to the SAC105 alloy, the impact absorbed energy increased from 8.1 J to 9.7 J by about 20% and literally no further improvement was observed by increasing the Bi content in the alloy. Vickers hardness tests were performed with a load of 245.2 mN and load dwell time of 10 s. The addition of Fe/Bi to SAC105 increased the hardness of the alloy from 10.5 HV to 22.6 HV showing an increase of more than two fold. Shear tests were performed with a shear speed of 0.25 mm/min. Shear strength almost doubled for the Fe/Bi added SAC105, as compared to the base alloy, increasing from 17.8 MPa to 343 MPa. The microstructure study shows that Bi is dissolved in the solder bulk and strengthens the solder alloys by its solid solution strengthening mechanism. The beta-Sn grain size, as revealed by cross-polarized optical microscopy, significantly reduced from 60-100 mu m to 20-40 mu m with Fe/Bi addition to SAC105. The micrographs of field emission scanning electron microscopy (FESEM) with backscattered electron detector and their further analysis via ImageJ software indicated that Fe/Bi addition to SAC105 significantly reduced the Ag3Sn and Cu6Sn5 IMCs size and refined the microstructure. These changes in the microstructure of Fe/Bi added SAC105 expectedly resulted in such improvement in their mechanical properties. (C) 2016 Elsevier Ltd. All rights reserved.