Micropillar compression deformation of single crystals of Co3(Al,W) with the L12 structure
Micropillar compression deformation of single crystals of Co3(Al,W) with the L12 structure
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DOI：
10.1016/j.scriptamat.2016.04.029
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发表时间：
2016-08-01
影响因子：
6
通讯作者：
Inui, Haruyuki
中科院分区：
文献类型：
--
作者：
Chen, Zhenghao M. T.;Okamoto, Norihiko L.;Inui, Haruyuki
本文研究了L1（2）-Co-3（Al，W）单晶微柱在室温下的压缩变形行为与微柱尺寸和晶体取向的关系。临界分辨剪切应力（CRSS）服从逆幂律缩放对支柱的大小，是独立的方向。通过外推微柱的CRSS尺寸依赖性估算了Co-3（Al，W）的室温体相CRSS值，并对Co-3（Al，W）和Ni 3Al基化合物的高温强度进行了比较。Co-3（Al，W）已经证明不足以为Co基超合金提供优异的高温强度，至少对于三元组合物。(C)2016爱思唯尔有限公司版权所有。
The compression deformation behavior of single-crystal micropillars of L1(2)-Co-3(Al,W) has been investigated at room temperature as a function of pillar size and crystal orientation. The critical resolved shear stress (CRSS) obeys an inverse power-law scaling against pillar size and is independent of orientation. With the bulk CRSS value of Co-3(Al,W) at room temperature estimated by extrapolating the size dependence of CRSS for micropillars, comparison of high-temperature strength is made on the CRSS values for Co-3(Al,W) and Ni3Al-based compounds. Co-3(Al,W) has turned out not to be strong enough to provide excellent high-temperature strength for Co-based superalloys, at least for ternary composition. (C) 2016 Elsevier Ltd. All rights reserved.