Effects of Aging Temperature on the Mechanical Properties and Precipitation Behavior of a Pre-strained Al–Cu–Mg–Ag Alloy

Jian Wang; Jingpei Xie; Zhiyi Liu; Aiqin Wang; Wenyan Wang

doi:10.1007/s12540-022-01229-1

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자료유형: 학술저널

저자정보: Jian Wang (Henan University of Science and Technology) Jingpei Xie (Henan University of Science and Technology) Zhiyi Liu (Central South University) Aiqin Wang (Henan University of Science and Technology) Wenyan Wang (Henan University of Science and Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.2

발행연도: 2023.2

수록면: 293 - 302 (10page)

DOI: 10.1007/s12540-022-01229-1

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In this work, effects of artificial aging temperature on the mechanical properties and precipitation behavior of a pre-strainedAl–Cu–Mg–Ag alloy were investigated by hardness and tensile tests, and quantitative transmission electron microscopeanalysis. Three aging conditions, a single aging at a high temperature (T8H), a single aging at a low temperature (T8L) andan interrupted aging at low temperature following under-aging at a higher temperature (T8I4), were compared. Based on thequantitative analysis of the strengthening phases, the evolution law of the average diameter, thickness and volume fractionof Ω plates with the aging time for a pre-stretched Al–Cu–Mg–Ag alloy aged at 190 °C/160 °C may be predicted by themodified equations. The precipitation behavior of Ω precipitates was confirmed by considering the coarsening kinetics ofthem. Results show that a higher aging temperature can increase the precipitation kinetics of Ω phase and inhibit the precipitationof θ′ phase. Thus, a new type of interrupted aging treatment, T8I4 (3.2% pre-stretch + 190 °C/1 h + 160 °C/10 h),was proposed to enhance the strength of the pre-stretched Al–Cu–Mg–Ag alloy.

#Al–Cu–Mg–Ag alloy · Aging temperature · Precipitation behavior · Strengthening mechanism

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