Effect of crystal orientation on incipient plasticity during nanoindentation of magnesium
Effect of crystal orientation on incipient plasticity during nanoindentation of magnesium
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DOI：
10.1016/j.actamat.2017.07.052
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发表时间：
2017-10
期刊：
影响因子：
9.4
通讯作者：
H. Somekawa;T. Tsuru;A. Singh;S. Miura;C. Schuh
中科院分区：
文献类型：
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作者：
H. Somekawa;T. Tsuru;A. Singh;S. Miura;C. Schuh
通过实验和分子静力学模拟研究了纳米压痕过程中晶体取向对初塑性的影响。弹入行为是位错活动的结果，因此受晶体取向的影响。单晶实验结果表明，基面上的压痕比棱柱面上的压痕具有更高的弹入载荷和更大的弹入位移，分子静力学模拟也反映了这一影响。这种差异可以追溯到激活位错的类型，不仅基面位错和锥形位错对基面上的压痕都是活跃的，而且只有在棱柱面上第一次弹入时触发的基面位错才是活跃的。
The effect of crystal orientation on incipient plasticity during nanoindentation was investigated by experiments and molecular statics simulation. Pop-in behavior is a result of dislocation activity, and is therefore influenced by crystal orientation. Experimental results using single crystals indicated that indentations on the basal plane had higher pop-in loads and larger pop-in displacements than those on the prismatic plane, an effect also captured by molecular statics simulation. The difference can be traced to the types of activated dislocations, with not only basal but also pyramidal dislocations active for indentations on the basal plane, but only basal dislocations triggered at the first pop-in on the prismatic plane.