Exploring the Formation Mechanism of Deformation Twins in CrMnFeCoNi High Entropy Alloy

doi:10.1007/s40195-021-01362-7

Abstract

Abstract:

The deformation twins initiated in CrMnFeCoNi high entropy alloy at cryogenic temperature are experimentally studied. Under the external loading, a three-dimensional shear stress concentration originating from dislocation tangling at both the grain boundaries and twin boundaries could be formed, which promotes emission of partial dislocations from the planar defects and is thus considered to be the key factor for twin formation. A sympathetic nucleation mechanism is proposed to describe the nucleation behaviors of twins.

Key words: High entropy alloy, Deformation twinning, Defects, Shear stress concentration

Junwei Xie, Haokai Dong, Yuxiu Hao, Zhongding Fan, Chang-An Wang. Exploring the Formation Mechanism of Deformation Twins in CrMnFeCoNi High Entropy Alloy[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(8): 1275-1280.

Figures/Tables 4

Fig. 1 a Engineering strain-stress curves and b-d TEM images with the corresponding selected area electron diffraction (SAED) patterns of the specimen deformed at different temperatures

Fig. 2 TEM images of the specimens deformed at various condition for revealing the formation site of twins: a?-?70 °C, 12.5%, b?-?70 °C, 25%, c, d?-?196 °C, 37.5%

Fig. 3 High-resolution TEM images of the specimens deformed at various condition: a, b?-?70 °C, 25%, c, d?-?196 °C, 37.5%. b and c are the partial enlarged areas of Fig. 2b and d. The direction of incident electron beam is all parallel to [110]

Fig. 4 a Diagram of simulated 3D twinning and configurations of twins produced by b edge-to-face, c edge-to-edge and d face to face sympathetic nucleation (SN)

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