The effect of solution temperature on the precipitates evolution and aging hardening response of Al-15%Mg2Si(-1%Cu) alloys

Sun, Yue; Hu, Min; Li, Mengran; Li, Chong; Zhu, Xiangzhen; Xia, Xingchuan; Yu, Liming; Liu, Yongchang

doi:10.1016/j.jmrt.2022.01.094

Cited by 10 publications

(1 citation statement)

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“…Luna et al [ 25 ] proved that a two-stage solution cycle treatment is more effective than a conventional single-stage solution treatment in improving the mechanical properties of the alloy. Sun et al [ 26 ] reported that the solid solution temperature of the Al-15% Mg 2 Si (−1% Cu) alloy significantly affected the formation of precipitated phases and age-hardening behaviour. Although the evolution of a second phase in the heat treatment of Al-Si-Cu-Mg-Ni alloys has been extensively studied, studies on the influence of heat treatment parameters on the morphology distribution of the second phase in cast alloys with transition elements are limited.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Cast Al-Si-Cu-Mg-Ni-Cr Alloys: Effects of Time and Temperature on Two-Stage Solution Treatment and Ageing

Qin

Liu

et al. 2023

Materials

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Ameliorating the high-temperature performance of cast Al-Si alloys used as engine components is essential. The effects of different T6 heat-treatment processes on the microstructure and mechanical properties of cast Al-Si-Cu-Mg-Ni-Cr alloys were investigated in the present study. The results demonstrate that, under the optimal solution treatment conditions of 500 °C for 2 h and 540 °C for 4 h, the T-Al9FeNi phase was present in the alloy, and the roundness of primary Si and the aspect ratio of eutectic Si in the alloy reached valley values of 1.46 and 2.56, respectively. With increasing ageing time at 180 °C, the tensile strength significantly improved, while the microhardness first increased and then decreased. When the ageing time was 4 h, microhardness reached a peak value of 155.82 HV. The fracture characteristics changed from quasi-cleavage to the coexistence of quasi-cleavage and dimples. After heat treatment, the high-temperature tensile properties of the alloy improved, which is a significant advantage compared to the as-cast alloy. The stable Al3Ni and Al9FeNi phases inhibited the cracking of the alloy at 350 °C.

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Section: Introductionmentioning

confidence: 99%