深冷变形对2219铝合金环件晶粒组织及性能的影响

doi:10.11896/cldb.19080055

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Abstract Aiming at the problem of coarse grains in the traditional high temperature deformation process of 2219 aluminum alloy rings, this paper proposes a new process of ring cryogenic deformation. The microstructure and mechanical properties of 2219 aluminum alloy rings were studied by means of metallographic microscope (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and tensile testing. The results show that the cryogenic deformation accumulates a large amount of storage energy in the form of high-density dislocations, which helps to recrystallize and refine grains during subsequent solution treatment and rolling process. The grain refinement makes the distribution of stress inside the alloy more uniform, and the crack propagation path is also more tortuous. The fracture mechanism is mainly along the crystal fracture. Compared with the deformation at high temperature (480 ℃), the sample undergoes cryogenic deformation under liquid nitrogen conditions and combined with heat treatment could significantly improve its comprehensive mechanical properties. Its tensile strength, yield strength and elongation are increased by an average of 20 MPa, 22 MPa and 3.0%, respectively, and its anisotropy is also significantly reduced.

Key words： 2219 aluminum alloy rings cryogenic deformation dislocation grain mechanical properties

Published: 14 July 2020

CLC number:

TG146.2

Fund:This work was financially supported by the Natural Science Foundation of China (51875583), the Joint Funds of the National Natural Science (U1637601),the State Key Laboratory of High Performance Complex Manufacturing Foundation of China (ZZYJKT2018-03).

About author:: Jianwu Huangborn in 1995, majored in mechanical engineering at School of Mechanical and Electrical Engineering of Central South University. Mainly engaged in aerospace light alloy components molding technology research.
Youping Yiis a professor at the School of Mechanical and Electrical Engineering of Central South University and a doctoral tutor, 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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	HUANG Jianwu
	YI Youping
	HUANG Shiquan
	GUO Wanfu

Cite this article:

HUANG Jianwu,YI Youping,HUANG Shiquan, et al. Effects of Cryogenic Deformation on Grain Structure and Properties of 2219 Aluminum Alloy Rings[J]. Materials Reports, 2020, 34(14): 14129-14133.

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http://www.mater-rep.com/EN/10.11896/cldb.19080055 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14129

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