Effect of Cu addition on microstructures and tensile properties of high-pressure die-casting Al-5.5Mg-0.7Mn alloy

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英文篇名：Effect of Cu addition on microstructures and tensile properties of high-pressure die-casting Al-5.5Mg-0.7Mn alloy 作者：Lingyang ; Yuan ; Liming ; Peng ; Jingyu ; Han ; Baoliang ; Liu ; Yujuan ; Wu ; Juan ; Chen 英文作者：Lingyang Yuan;Liming Peng;Jingyu Han;Baoliang Liu;Yujuan Wu;Juan Chen;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 Light Alloy Net Forming National Engineering Research Center Co.,Ltd.; 英文关键词：Die casting;;Al-Mg alloys;;Cu addition;;Al_2 CuMg phase;;Tensile properties 中文刊名：CLKJ 英文刊名：材料科学技术(英文版) 机构：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 Light Alloy Net Forming National Engineering Research Center Co.,Ltd.; 出版日期：2019-06-15 出版单位：Journal of Materials Science & Technology 年：2019 期：v.35 基金：supported financially by the National Key Research and Development Program of China (No. 2016YFB0301001) 语种：英文; 页：CLKJ201906009 页数：10 CN：06 ISSN：21-1315/TG 分类号：63-72

摘要

In this study, Cu was added into the high-pressure die-casting Al-5.5 Mg-0.7 Mn(wt%) alloy to improve the tensile properties. The effects of Cu addition on the microstructures, mechanical properties of the Al-5.5 Mg-0.7 Mn 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 Al_2 CuMg particles distributed along the grain boundaries in the as-cast alloys. Furthermore, the rest of Cu can dissolve into the matrixes. The lath-shaped Al_2 CuMg precipitates with a size of 15–20 nm × 2–4 nm were generated in the T5-treated Al-5.5 Mg-0.7 Mn-x Cu(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 Al_2 CuMg phase formation along the grain boundaries, which causes more cracks during tensile deformation and lower ductility. Al-5.5 Mg-0.7 Mn-0.8 Cu 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-5.5 Mg-0.7 Mn-0.8 Cu alloy, while the yield strength significantly was improved to 198 MPa after T5 treatment.
        In this study, Cu was added into the high-pressure die-casting Al-5.5 Mg-0.7 Mn(wt%) alloy to improve the tensile properties. The effects of Cu addition on the microstructures, mechanical properties of the Al-5.5 Mg-0.7 Mn 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 Al_2 CuMg particles distributed along the grain boundaries in the as-cast alloys. Furthermore, the rest of Cu can dissolve into the matrixes. The lath-shaped Al_2 CuMg precipitates with a size of 15–20 nm × 2–4 nm were generated in the T5-treated Al-5.5 Mg-0.7 Mn-x Cu(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 Al_2 CuMg phase formation along the grain boundaries, which causes more cracks during tensile deformation and lower ductility. Al-5.5 Mg-0.7 Mn-0.8 Cu 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-5.5 Mg-0.7 Mn-0.8 Cu alloy, while the yield strength significantly was improved to 198 MPa after T5 treatment.

引文

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