变形温度对2A14铝合金组织与力学性能的影响

doi:10.11896/cldb.19030073

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Abstract Aiming at the problems of coarse grains and second phase aggregation in the manufacture of large 2A14 aluminium alloy high cylinder parts, a new warm rolling process for high cylinder parts was proposed in this paper. The effects of hot and warm rolling on the microstructure and mechanical properties of 2A14 aluminum alloy were studied by using optical microscope (OM), scanning electronic microscopy (SEM), transmission electron microscopy (TEM) and tensile test. The results show that the comprehensive mechanical properties of 2A14 aluminium alloy can be significantly improved by warm rolling at 200 ℃ combined with heat treatment compared with that of hot rolling at 480 ℃. The tensile strength, yield strength and elongation of 2A14 aluminum alloy can reach 464 MPa, 386 MPa and 9.3%, respectively. A large amount of storage energy accumulated in the form of high density dislocation during warm rolling promotes the nucleation rate of recrystallization during solution process and refines dramaticly grain size. Meanwhile, warm rolling combined with heat treatment can fully break up and dissolve the coarse second-phase compounds in the alloy, improve their non-uniform distribution in the matrix, and promote the precipitation of S′ phase, the main strengthening phase of 2A14 aluminum alloy.

Key words： 2A14 aluminum alloy deformation temperature warm rolling dislocation second-phase mechanical properties

Published: 12 March 2020

CLC number:

TG146.2

Fund:This work was financially supported by the Strategic Rocket Innovation Foundation (Y18122), the National Natural Science Foundation of China (51875583), the State Key Laboratory of High Performance Complex Manufacturing Foundation of China (ZZYJKT2018-03).

About author:: Dengliang Tongborn in 1995, majored in mechanical engineering from Light Alloy Research Institute of Central South University. Mainly engaged in the research of forming process of aluminium alloy forgings; Youping Yi is a doctoral tutor and a professor at the School of Mechanical and Electrical Engineering of Central South University, mainly engaged in the research of aerospace and aerospace light alloy component forming processes and molds, heat treatment processes and equipment.

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	TONG Dengliang
	YI Youping
	HUANG Shiquan
	HE Hailin
	GUO Wanfu
	WANG Bingxiang

Cite this article:

TONG Dengliang,YI Youping,HUANG Shiquan, et al. Effects of Deformation Temperature on Microstructure and Mechanical Properties of 2A14 Aluminum Alloy[J]. Materials Reports, 2020, 34(6): 6100-6104.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.19030073 OR http://www.mater-rep.com/EN/Y2020/V34/I6/6100

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