Annealing optimization for tin-lead eutectic solder by constitutive experiment and simulation
Annealing optimization for tin-lead eutectic solder by constitutive experiment and simulation
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本构实验与模拟对锡铅共晶焊料退火优化
DOI：
10.1557/jmr.2017.166
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发表时间：
2017-08-01
影响因子：
2.7
通讯作者：
Yao, Yao
中科院分区：
文献类型：
--
作者：
Long, Xu;Wang, Shaobin;Yao, Yao
对Sn-Pb共晶钎料合金进行了不同退火温度（60-180 ℃）和退火时间（2-48 h）的狗骨形试样的单轴拉伸试验。采用10（-4）s（-1）~ 10（-3）s（-1）的低应变速率研究了蠕变与塑性之间的竞争以及退火条件的速率效应。结果表明，退火温度对材料性能的影响大于退火时间对材料性能的影响。高达180 ℃的较高温度通常导致退火试样的较高屈服和极限应力以及极限应变。最佳退火条件为180 ℃ × 6 h，可稳定有效地提高强度和塑性。通过建立一个简洁的蠕变和塑性统一本构模型，量化了该模型对应变速率和退火条件的敏感性，同时考虑了蠕变和硬化特性。参数校准理论上证实了实验中观察到的最佳退火条件。
For Sn-Pb eutectic solder alloy, uniaxial tensile tests were conducted to dog-bone type specimens annealed at different temperatures (60-180 degrees C) and durations (2-48 h). Low strain rates ranging from 10(-4) s(-1) to 10(-3) s(-1) were applied to study the competition between creep and plasticity and also the rate dependent effect of annealing condition. It is found that the influence of annealing temperature on material properties is more than that of annealing duration. Higher temperature up to 180 degrees C generally leads to higher yield and ultimate stresses and ultimate strain of annealed specimens. The optimal annealing condition is suggested to be 180 degrees C for 6 h for stable and efficient improvements in both strength and ductility. By proposing a concise unified creep and plasticity constitutive model, the sensitivity to strain rate and annealing condition is quantified with consideration of both creep and hardening properties. Parameter calibration theoretically confirms the observed optimal annealing condition in experiments.