Crystallographic orientation dependent fracture behavior in tantalum single crystals

SCRIPTA MATERIALIA

卷:191

Article

Lim, Hojun¹  Noell, Philip J.²  Carroll, Jay D.² 

[1] Sandia Natl Labs, Dept Mat & Data Sci, Albuquerque, NM 87185 USA

[2] Sandia Natl Labs, Dept Mat Mech & Tribol, Albuquerque, NM 87185 USA

关键词: Failure;    Single crystal;    Tantalum;    Crystal plasticity;   

DOI  :  10.1016/j.scriptamat.2020.09.017

来源: Elsevier

【 摘 要 】

We report crystallographic orientation dependent fracture behavior in tantalum single crystals with the tensile axes oriented close to [100], [110] and [111] directions. Three tantalum single crystals were deformed in quasi-static, uniaxial tension and their fracture surfaces were characterized. To understand different deformation modes and failure mechanisms, crystal plasticity-finite element (CP-FE) simulations were performed. Both experiments and CP-FE simulations showed strong strain localization and shear banding in the similar to[100] specimen, little rotation and profuse necking in the similar to[110] specimen, and significant crystal rotations associated with shear-dominated behavior in the similar to[111] single crystal. In addition, voids were observed in fracture surfaces of similar to[100] and similar to[111] single crystals while the similar to[110] specimen was void-free. The failure processes of these single crystals showed that dislocation boundaries are necessary for void nucleation in pure tantalum. This work demonstrates strong effects of crystallographic orientations in failure behaviors. Published by Elsevier Ltd on behalf of Acta Materialia Inc.

【 授权许可】

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