【摘要】 利用FIB(Focused Ion Beam)将发生氧化的稀土相ErSn3剖开,研究其表面Sn晶须的生长机制。结果表明:时效过程中稀土相ErSn3发生了不均匀氧化,在其内部形成了大量的"快速氧化通道"及"氧化区"。由于在Sn晶须的根部及附近同时存在两个"氧化区",且它们通过"快速氧化通道"相连。因此,提出了Sn晶须生长的"双压应力区"模型,即Sn晶须的生长需要形成两个压应力区,其根部的"低压应力区"将为Sn晶须的形成提供驱动力,而"高压应力区"将为Sn晶须的生长提供Sn原子。更多还原

【Abstract】 Mechanism of tin whisker growth on the surface of the oxidized ErSn3 phase was investigated by analyzing FIB images of the oxidized ErSn3 phase.The results indicate that many "rapid oxidation channels" and "oxidation zones" were formed inside the ErSn3 phase after its inhomogenous oxidation.Because two "oxidation zones",which were connected with "rapid oxidation channel",were formed below and around the root of whisker,respectively.Thus,a "double compressive stress zones" model for tin whisker growth was proposed as follows:two compressive stress zones are required for tin whisker growth,the "low compressive stress zone" that located at the root of whisker provides driving force for whisker formation and the "high compressive stress zone" provides tin atoms for whisker growth.更多还原