Effect of aging process on microstructure and mechanical properties of 2219 aluminum alloy

doi:10.13251/j.issn.0254-6051.2023.10.017

Abstract

Abstract: Effect of aging process on microstructure and mechanical properties of 2219 aluminum alloy was investigated by means of tensile test, transmission electron microscope (TEM) and scanning electron microscope (SEM). The results show that the aging hardening response of the 2219 aluminum alloy is very slow when the alloy is aged at 120 ℃, even aged for a long time, the alloy is still under aging. When the 2219 aluminum alloy is aged at 150, 165 and 175 ℃, it shows a dual-peak aging curve, owing to the overlap of precipitation of GP zones and formation of θ″ phase, and the aging process is divided into three stages as under-aging, peak-aging and over-aging. With the increase of aging temperature, the aging hardening response of the 2219 aluminum alloy becomes faster, the elongation and peak-aging time are reduced, so in comprehensive consideration of the strength and elongation of the alloy, the favorable aging process is at 165 ℃×24 h. After peak aging (165 ℃×24 h), the ultimate tensile strength, yield strength and elongation of the aluminum alloy are 412.2 MPa, 310.8 MPa and 7.9%, respectively.

Key words: 2219 aluminum alloy, aging process, mechanical properties, microstructure

CLC Number:

TG146

Wang Huimin, Li Yanguang, Ma Bingxin. Effect of aging process on microstructure and mechanical properties of 2219 aluminum alloy[J]. Heat Treatment of Metals, 2023, 48(10): 123-128.

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