In situ transmission electron microscopy observations of room-temperature plasticity in sub-micron-size TaC(100) and TaC(011) single crystals

SCRIPTA MATERIALIA

卷:100

Article

Kiani, S.¹  Ratsch, C.^2,3  Minor, A. M.^4,5  Yang, J. -M.¹  Kodambaka, S.¹ 

[1] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA

[2] Univ Calif Los Angeles, Dept Math, Los Angeles, CA 90095 USA

[3] Univ Calif Los Angeles, Inst Pure & Appl Math, Los Angeles, CA 90095 USA

[4] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[5] Univ Calif Los Angeles, Lawrence Berkeley Natl Lab, Natl Ctr Elect Microscopy, Los Angeles, CA 90095 USA

关键词: Refractory carbides;    Tantalum carbide;    Room-temperature plasticity;    In situ transmission electron microscopy;    Slip systems;   

DOI  :  10.1016/j.scriptamat.2014.11.036

来源: Elsevier

【 摘 要 】

Using in situ electron microscopy based uniaxial compression and density functional theory calculations, we investigated the room-temperature mechanical responses of sub-micron-scale cylindrical TaC(100) and TaC(011) pillars. The TaC(100) and TaC(011) pillars deform plastically via shear along {1 (1) over bar0} (1 (1) over bar0) and {111} (110), respectively. Interestingly, both TaC(100) and TaC(011) exhibit size-independent yield strengths, with average values of 9 +/- 2.4 and 11 +/- 3.4 GPa, respectively. Our results provide new insights into the role of crystal anisotropy on room-temperature plasticity in TaC. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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