挤压Mg-Y-Ni-Co合金的显微组织、加工性能及塑性变形行为

doi:10.11896/cldb.23060144

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Abstract The microstructure, processing properties and plastic deformation behavior of an extruded Mg-2Y-0.5Ni-0.5Co (at%) alloy were investigated by optical microscopy (OM), X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and universal experiment machine. The microstructure of the extruded alloy mainly consisted of α-Mg, lamellar and blocky 18R-LPSO phase distributed along the extrusion direction, MgY(Co,Ni)₄ phase, and fine strip-like 14H-LPSO phase in the grain interior. Tensile test results showed that the extruded alloy had good room temperature plasticity and its elongation to failure was higher than 15%. With increasing temperature and decreasing strain rate, the tensile strengths of the alloy decreased, while the plasticity increased. The alloy exhibited quasi-super plasticity with elongation to failure of 117.87% and 143.9% at 300 ℃ under the strain rates of 1×10^-4 s^-3 and 1×10^-4 s^-1, respectively. The constructed thermal processing profile was optimized for the stable processing interval of the extruded alloy: 275—300 ℃ with strain rates from 1×10^-4 s^-1 to 1×10^-3 s^-1. The deformation behavior of the extruded alloy varied with temperature and strain rate. At low temperatures (RT—200 ℃) and different strain rates, the deformation mechanism of the alloy was dominated by dislocation slip. At high temperature (300 ℃) and low strain rates (1×10^-4 s^-1 and 1×10^-3 s^-1), the deformation mechanism of the alloy was dislocation slip coordinated by grain boundary slip.

Key words： extruded Mg-Y-Ni-Co alloy microstructure processing property deformation behavior

Published: 10 November 2024 Online: 2024-11-11

CLC number:

TG146.2

Fund:National Natural Science Foundation of China (52261027, 51961021, 52001152), Open Project of State Key Laboratory of Mechanical Behavior of Materials (20192102), Undergraduate Innovation and Entrepreneurship Training Program (DC2022017, DC2022025, DC2022027).

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	Articles by authors
	BI Guangli
	RAN Jishang
	MAN Hongsheng
	JIANG Jing
	MENG Shuaiju
	BI Guangkuo
	WANG Haidong
	LI Yuandong

Cite this article:

BI Guangli,RAN Jishang,MAN Hongsheng, et al. Microstructure, Processing Properties and Plastic Deformation Behavior of an Extruded Mg-Y-Ni-Co Alloy[J]. Materials Reports, 2024, 38(21): 23060144-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23060144 OR http://www.mater-rep.com/EN/Y2024/V38/I21/23060144

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