Compressive deformation of MoAIB up to 1100 °C

JOURNAL OF ALLOYS AND COMPOUNDS

卷:774

Article

Chen, Yexiao¹  Kota, Sankalp²  Barsoum, Michel W.²  Radovic, Miladin¹ 

[1] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA

[2] Drexel Univ, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA

关键词: Brittle-to-plastic transition;    Kinking;    Compression;    Microcracking;   

DOI  :  10.1016/j.jallcom.2018.09.124

来源: Elsevier

【 摘 要 】

Quasi-static and cyclic compression tests at room and high temperatures were conducted on MoAIB, which has an atomically laminated structure that consists of a Mo-B sublattice interleaved by double layers of pure Al. The results show that MoAIB goes through a brittle-to-plastic transition (BPT) at around 800 degrees C. Below the BPT temperature, MoAIB behaves as a linear-elastic solid and fails in a brittle manner at stresses exceeding 2 GPa despite the fact that the grain size was 6 +/- 1 mu m. While post-testing microstructural observation showed only a few bends and kinks of individual grains, extensive microcracking was observed. Above the BPT temperature, the deformation was non-linear elastic with open stressstrain hysteresis loops and small irrecoverable strains after each loading-unloading cycle. This behavior was attributed predominantly to micocracks that appear to be constrained mostly within a shear band and coalesce into larger cracks. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

Free