首页|Preparation of a novel ultra-high strength Al-Si-Cu-Ni alloy at room/elevated temperature by squeeze casting combined with a new heat treatment process
Preparation of a novel ultra-high strength Al-Si-Cu-Ni alloy at room/elevated temperature by squeeze casting combined with a new heat treatment process
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In this paper,the microstructure evolution and properties of squeeze-cast Al-8Si-1.5Cu-1Ni-0.5Mg-0.5Mn-0.2V-0.2Ti-0.2Zr alloy(hereafter,Al-Si-Cu-Ni alloy for short)were investigated under various solution processes,evaluating the mechanical properties at room and elevated temperatures for both as-cast and T6-treated states.The results showed that following the optimal two-stage solution(i.e.,solution at 510 ℃ for 6 h+solution at 530 ℃ for 8 h)and subsequent aging at 190 ℃ for 10 h,referred to as the S530-T6 treatment,the Al-Si-Cu-Ni alloy exhibited excellent room/high temperature performance.The ultimate tensile strength(UTS),yield strength(YS)and elongation of the alloy at room temperature were 410 MPa,368 MPa and 1.5％,and the UTS,YS and elongation of alloy at 300 ℃ were 177 MPa,170 MPa and 6％,respectively.The increase in strength at room temperature is mainly attributed to the spheroidization of eutectic silicon and the precipitate strengthening aroused from uniformly dispersed nano-sized Q-Al4Cu2Mg8Si7,σ-Al5Cu6Mg2 and θ'-Al2Cu phases,while the in-crease in strength at high temperature is due to the formation of heat-resistant Ni-rich phases and the improvement of the micromorphology of high melting point intermetallic compounds.
Shulin Lü、Shilong Li、Zhaoxiang Yan、Shusen Wu、Jianyu Li、Xiaoyuan Ji
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State Key Lab of Materials Processing and Die & Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan,430074,PR China
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