Nanoindentation behavior and deformed microstructures in coarse-grained magnesium alloys
Nanoindentation behavior and deformed microstructures in coarse-grained magnesium alloys
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DOI：
10.1016/j.scriptamat.2012.11.010
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发表时间：
2013-03
影响因子：
6
通讯作者：
H. Somekawa;C. Schuh
中科院分区：
文献类型：
--
作者：
H. Somekawa;C. Schuh
采用低速率和高速率的纳米压痕研究了Mg和一些粗晶~ 100μm的稀固溶Mg合金的变形。与先前对细晶合金的报道不同，变形后的显微组织观察揭示了{101¯2}孪晶的形成。这些孪生体在压痕过程中形成较早，导致应变相容性约束，促进交叉滑移，在应变速率0.02-170s−1范围内的特征激活体积在40 ~ 100b3之间。
Nanoindentations at both low and high rates are used to study deformation of Mg and some dilute solid-solution Mg alloys with coarse grains ∼100μm in size. Unlike prior reports in fine-grained alloys, post-deformation microstructural observations reveal the formation of {101¯2} twins. These twins are proposed to form early during indentation, leading to strain compatibility constraints that promote cross-slip with a characteristic activation volume between 40 and 100b3in the strain rate range of 0.02–170s−1.