Effect of aging on microstructure and properties of ADC12 die cast aluminum alloy

doi:10.13251/j.issn.0254-6051.2022.12.015

Abstract

Abstract: Effect of aging process on microstructure, mechanical properties and dimensional stability of ADC12 die cast aluminum alloy was studied by means of microscopy, tensile test and dimensional test. The results show that with the increase of aging time or temperature, strengthening particles are gradually dispersed and precipitated in the alloy, and the strength of the alloy tends to increase, with the further increase of aging time or temperature, the strengthened particles begin to aggregate and grow up, and the strength of the alloy decreases. In the heat preservation process after aging, there are two main factors affecting the specimen size, one is residual stress, the other is solid phase transformation. When the aging temperature is low or the aging time is short, the specimen size lengthening caused by residual stress relief is dominant, and the specimen size elongates. With the increase of aging time or temperature, the specimen length shortening caused by solid phase transformation is dominant. and the specimen size changes from positive value to negative value, that is the size shortens. Considering the tensile properties, economic benefits and the principle of minimizing size change of the alloy, the suitable aging process for the ADC12 alloy is 200-220 ℃×4 h or 220-240 ℃×2 h.

Key words: ADC12 die cast aluminum alloy, aging process, microstructure, mechanical properties, dimensional stability

CLC Number:

TG146.2

Ma Dongwei, Li Wenqiao, Zhang Yuanhao, Shi Qiuyue, Wu Xiaofeng, Wu Chengjie. Effect of aging on microstructure and properties of ADC12 die cast aluminum alloy[J]. Heat Treatment of Metals, 2022, 47(12): 90-94.

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