柱状多晶Mg-Gd-Y合金形变组织演变及形变硬化机制

doi:10.11896/cldb.21110055

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Abstract The Mg-6.38Gd-0.45Y alloy with columnar polycrystalline structure was prepared by directional solidification. The growth orientation of the columnar crystals was concentrated in [224-3], and the Schmid factor (SF) of basal 〈a〉 slip system of columnar crystals was greater than 0.4. Afterwards, the tensile deformation of the alloy at room temperature was studied. At the initial stage of deformation, {101-2} tensile twinning in columnar crystals in soft orientation were activated to coordinate strain. Thereafter, {101-2} tensile twin boundaries expanded rapidly and widely, and swallowed the matrix, which gradually changed the orientation of the matrix to [1-21-0] (SF＜0.15). As a result, {101-1} compression twinning and {101-1}-{101-2} double twinning were started to coordinate deformation. Compression twins and double twins were easy to form compression twin bands, and to run through the whole grain. Subsequently, the extended dislocations and tensile twin boundaries were intertwined with compression twin bands, and thus strain hardening occurs. However, the strengthening resulted in severe stress concentration in some regions, where microcracks would arise.

Key words： growth orientation Mg-Gd-Y alloy tensile twinning compression twin bands

Published: 25 May 2023 Online: 2023-05-23

CLC number:

TG146.22

Fund:National Natural Science Foundation of China (51775099), and Natural Science Foundation of Hebei Province (E2018501033, E2021501019).

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	Articles by authors
	CHAI Tao
	GENG Chuangang
	FANG Daran
	ZHAO Shengshi
	LIN Xiaoping
	DONG Yun

Cite this article:

CHAI Tao,GENG Chuangang,FANG Daran, et al. Microstructure Evolution and Strain Hardening Mechanism of Mg-Gd-Y Alloy with Columnar Polycrystalline Structure[J]. Materials Reports, 2023, 37(10): 21110055-6.

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http://www.mater-rep.com/EN/10.11896/cldb.21110055 OR http://www.mater-rep.com/EN/Y2023/V37/I10/21110055

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