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Micro Mechanical Behaviors of Sn, SnPb and SnAg Solder Alloys during In-Situ Tensile Testing under TEM

机译:TEM下原位拉伸测试中Sn,SnPb和SnAg焊料合金的微观力学行为

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This study investigates the micro mechanical behavior of 100Sn, 63Sn37Pb, and 96.5Sn3.5Ag eutectic solder alloys during tensile tests under the transmission electron microscope (TEM).The results shows that fracture was finished in these viscoplastic materials by connecting discontinuous cracks or voids during TEM in-situ tensile testing. Depending on remarkable vacancy diffusion ability, microvoids were nucleated and developed in the dislocation free zone (DFZ) or super thinned area ahead of crack tip. The cracks were propagated by linking up with the nanocracks ahead of crack tip under the effective promotion of the inverse dislocation emission. Differing from the 100Sn, dislocation behavior of Sn-Pb eutectic was concentrated along the grain boundaries, and exhibited mainly by dislocation climb. However, in Sn3.5Ag specimen, the fracture manner was intragranular dominated in Sn-rich dendrites. The microvoids in front of the main crack were formed by the growing of the defects nucleated around the Ag3Sn particles in the Sn dendrites.
机译:本研究研究了透射电子显微镜(TEM)在拉伸试验中100Sn,63Sn37Pb和96.5Sn3.5Ag共晶焊料合金的微观力学行为,结果表明这些粘塑性材料的断裂是通过在连接过程中连接不连续的裂纹或空隙而完成的TEM原位拉伸测试。依靠显着的空位扩散能力,微孔在裂纹尖端之前的位错自由区(DFZ)或超薄区域中形核并形成。在反向位错发射的有效促进下,裂纹通过与裂纹尖端之前的纳米裂纹连接而扩展。与100Sn不同,Sn-Pb共晶的位错行为沿晶界集中,主要表现为位错爬升。但是,在Sn3.5Ag样品中,富锡树枝状晶体的断裂方式以晶内为主。通过在Sn树枝状晶体中的Ag3Sn颗粒周围成核的缺陷的生长,形成了主裂纹前面的微孔。

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