纯锡的速率相关性变形行为

Rate dependent deformation behavior of pure tin

考察了纯锡在拉伸载荷下的力学性能及形变,探讨了应变速率对纯锡的变形机制的影响。采用扫描电镜形貌观察,对比不同应变速率（0.001-0.1 s^-1）下样品表面的晶粒形貌、形变特征、断口信息。发现在较低的应变速率（0.001 s^-1）下,纯锡的形变机制以蠕变为主要模式;在较高的应变速率（0.1 s^-1）下,形变机制以位错滑移为主要特征。

The effect of strain rate on deformation mechanisms of pure tin was discussed by investigation on the mechanical properties and deformation under tensile loading. The grain morphology, deformation and fracture surface were observed by scanning electron microscope（SEM） at the strain range of 0.001–0.1 s^-1.The results show that creep induced deformation is the main mode at a lower strain rate of 0.001 s^-1, while deformation mechanism is dislocation sliding as major manner with the strain rate increasing to be 0.1 s^-1.