T73 two-stage aging process of 7050 high-strength aluminum alloy rivet wire

doi:10.13251/j.issn.0254-6051.2023.03.019

Abstract

Abstract: Properties of the domestic 7050 high strength aluminum alloy wire secondary aged at 177-182 ℃ for different time were studied by room temperature tensile, room temperature shearing and upsetting tests. The fracture morphology was studied by means of scanning electron microscope (SEM) and the precipitation phase was studied by means of transmission electron microscope (TEM). The results show that the tensile strength and the shearing strength decrease gradually with the increase of secondary aging temperature and secondary aging time. The upsetting specimens do not crack when the shear strength is less than 330 MPa. The TEM microstructure show that the higher the aging temperature and the long the aging time, the larger the size and the inter-spacing of precipitated phase are, but morphology of precipitated phase changes little. The tensile fracture morphologies show that the fracture mode is a mixture of ductile fracture and intergranular fracture. The dimple number and size increase and the intergranular fracture decreases with the increase of secondary aging temperature and aging time.

Key words: 7050 high strength aluminum alloy, rivet wire, T73 heat treatment, microstructure, fracture

CLC Number:

TG146.2

Li Huiqu, Wang Liang, Zang Jinxin, Hao Min, Chen Junzhou. T73 two-stage aging process of 7050 high-strength aluminum alloy rivet wire[J]. Heat Treatment of Metals, 2023, 48(3): 112-117.

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