Effect of Cu addition on microstructures and tensile properties of high-pressure die-casting Al-5.5Mg-0.7Mn alloy |
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| Affiliation: | 1. National Engineering Research Center of Light Alloy Net Forming and Key State Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiaotong Univerisity, Shanghai, 200240, China;2. Shanghai Light Alloy Net Forming National Engineering Research Center Co., Ltd., Shanghai, 201615, China;1. Brunel Centre for Advanced Solidification Technology (BCAST), Brunel University London, Uxbridge, Middlesex UB8 3PH, United Kingdom;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;3. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;2. Brunel Centre for Advanced Solidification Technology (BCAST), Institute of Materials, Brunel University London, Uxbridge, Middlesex UB8 3PH, United Kingdom;3. Dept. of Mechanical Engineering, Aerospace and Civil Engineering, College of Engineering, Brunel University London, Uxbridge, Middlesex UB8 3PH, United Kingdom;1. National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;2. Institute of Materials for Mobile Energy, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | In this study, Cu was added into the high-pressure die-casting Al-5.5Mg-0.7Mn (wt%) alloy to improve the tensile properties. The effects of Cu addition on the microstructures, mechanical properties of the Al-5.5Mg-0.7Mn alloys under both as-cast and T5 treatment conditions have been investigated. Additions of 0.5 wt%, 0.8 wt% and 1.5 wt% Cu can lead to the formation of irregular-shaped Al2CuMg particles distributed along the grain boundaries in the as-cast alloys. Furthermore, the rest of Cu can dissolve into the matrixes. The lath-shaped Al2CuMg precipitates with a size of 15–20 nm × 2–4 nm were generated in the T5-treated Al-5.5Mg-0.7Mn-xCu (x = 0.5, 0.8, 1.5 wt%) alloys. The room temperature tensile and yield strengths of alloys increase with increasing the content of Cu. Increasing Cu content results in more Al2CuMg phase formation along the grain boundaries, which causes more cracks during tensile deformation and lower ductility. Al-5.5Mg-0.7Mn-0.8Cu alloy exhibits excellent comprehensive tensile properties under both as-cast and T5-treated conditions. The yield strength of 179 MPa, the ultimate tensile strength of 303 MPa and the elongation of 8.7% were achieved in the as-cast Al-5.5Mg-0.7Mn-0.8Cu alloy, while the yield strength significantly was improved to 198 MPa after T5 treatment. |
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| Keywords: | Die casting Al-Mg alloys Cu addition Tensile properties |
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