Nanoindentation creep behavior of grain boundary in pure magnesium
Nanoindentation creep behavior of grain boundary in pure magnesium
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DOI：
10.1080/09500839.2010.514577
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发表时间：
2010-09
影响因子：
1.2
通讯作者：
H. Somekawa;T. Mukai
中科院分区：
文献类型：
--
作者：
H. Somekawa;T. Mukai
在纯镁的晶界和晶粒内部进行纳米压痕蠕变测试。晶界表现出高应变率敏感性指数，并且由于晶界处的高扩散速率而以晶界滑动为主。晶界影响晶粒内部 2 µm 处区域的变形行为。另一方面，晶粒内部的应变率敏感性指数较低，因为其基体太大而不受晶界的影响。晶粒内部的变形机制被确定为位错滑移。
Nanoindentation creep tests were performed at the grain boundary and grain interior in pure magnesium. The grain boundary showed a high strain rate sensitivity exponent and was dominated by grain boundary sliding due to the high diffusion rate at the grain boundary. The grain boundary affected the deformation behavior of the area at a distance of 2 µm into the grain interior. On the other hand, the grain interior had a low strain rate sensitivity exponent, because its matrix was too large to be influenced by the grain boundary. The deformation mechanism in the grain interior was determined to be dislocation slip.