On the non-classical crystallographic slip in Tin+1AlCn MAX phases
On the non-classical crystallographic slip in Tin+1AlCn MAX phases
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DOI：
10.1016/j.scriptamat.2020.113698
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发表时间：
2021-03
影响因子：
6
通讯作者：
Zhiqiang Zhan;M. Radovic;Ankit Srivastava
中科院分区：
文献类型：
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作者：
Zhiqiang Zhan;M. Radovic;Ankit Srivastava
在这项工作中，我们研究了原子堆叠对一类原子层状三元碳化物（称为MAX相）的非经典（非施密德）晶体滑移的影响，其通式为Mn+1AXn，其中n的值表示堆叠顺序。为此，我们对不同取向的ti3alc2单晶微柱进行了压缩实验，并与Ti2AlC进行了对比。结果表明，与Ti2AlC类似，ti3alc2也表现出非经典的晶体滑移，其中晶体滑移既取决于分解的剪切应力，也取决于滑移面正方向的应力。然而，对于晶体滑移，ti3alc2的本征临界分解剪应力大于Ti2AlC，而ti3alc2的摩擦阻力小于Ti2AlC。本文还讨论了这些发现对这两种MAX相的多晶聚集体宏观响应的影响。
In this work, we investigate the effect of atomic stacking on non-classical (non-Schmid) crystallographic slip in a class of atomically layered ternary carbides referred to as MAX phases with general formula Mn+1AXn, where the value of n represents the stacking sequence. To this end, we have carried out compression tests on single crystal micropillars of Ti3AlC2with a range of crystallographic orientations and compared the results with that of Ti2AlC. Our results show that similar to Ti2AlC, Ti3AlC2also exhibits non-classical crystallographic slip, wherein the crystallographic slip depends on both the resolved shear stress and the stress normal to the slip plane. However, for crystallographic slip, the intrinsic critical resolved shear stress in Ti3AlC2is greater than Ti2AlC, while the frictional resistance in Ti3AlC2is smaller than Ti2AlC. The implications of these findings on the macroscopic response of polycrystalline aggregates of these two MAX phases is also discussed.