Micropillar compression deformation of single crystals of Co3(Al,W) with the L12 structure

SCRIPTA MATERIALIA

卷:121

Article

Chen, Zhenghao M. T.¹  Okamoto, Norihiko L.^1,2  Demura, Masahiko³  Inui, Haruyuki^1,2 

[1] Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan

[2] Kyoto Univ, Ctr Elements Strategy Initiat Struct Mat ESISM, Kyoto 6068501, Japan

[3] Natl Inst Mat Sci, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

关键词: Intermetallic compounds;    Size dependence;    Focused-ion beam (FIB);    Critical resolved shear stress (CRSS);    Yield stress anomaly (YSA);   

DOI  :  10.1016/j.scriptamat.2016.04.029

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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