Ti $_2$ MAX中纳米压痕诱导的形变孪晶
Nanoindentation-induced deformation twinning in MAX phase Ti$_2$AlN
摘要：
研究了MAX相Ti 2AlN的塑性形变机制。利用纳米压痕技术在单颗粒中诱导塑性形变，并利用聚焦离子束（FIB）技术在颗粒的截面中提取出透射电镜（TEM）薄片。通过结合TEM观察和自动晶体取向映射（ACOM），高度错位域（HMD）已被揭示低于纳米压痕印记。由于这些HMD之间的相对晶体取向的仔细分析，{11-22}和{11-21}变形孪晶已被确定为第一次在MAX阶段。复杂的结构，涉及二次孪生或不同的{11-22}孪生变体也已被表征。
英文摘要：
Plastic deformation mechanisms have been investigated in the MAX phase Ti2AlN. Nanoindentation has been used to induce plastic deformation in a single grain, and a Transmission Electron Microscopy (TEM) lamella has been extracted in cross section through the indent by using Focused Ion Beam (FIB) technique. By combining TEM observations and automated crystal orientation mapping (ACOM), highly misoriented domains (HMD) have been revealed below a nanoindentation imprint. Thanks to a careful analysis of the relative crystal orientations between these HMD, {11-22} and {11-21} deformation twins have been identified for the first time in a MAX phase. Complex structures, involving secondary twinning or different {11-22} twin variants have also been characterized.
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