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  4. Al-Si-Cu-Zn-X(X=Bi,Sb,Sr)压铸铝合金的显微组织、力学性能和腐蚀行为

中国有色金属学报(英文版), 2016, 26(1): 28-38. doi: 10.1016/S1003-6326(16)64085-2

Al-Si-Cu-Zn-X(X=Bi,Sb,Sr)压铸铝合金的显微组织、力学性能和腐蚀行为

Saeed FARAHANY 1, , Ali OURDJINI 2, , Hamid Reza BAKHSHESHI-RAD 3,

1.Department of Materials and Mechanical Engineering, Buein Zahra Technical University, Qazvin 3451745346, Iran

2.Department of Mechanical Engineering, Faculty of Engineering, University of Ottawa,Ottawa, 161 Louis Pasteur, KIN 6N5, Canada

3.Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering,Universiti Teknologi Malaysia (UTM), Johor Bahru 81310, Malaysia

关键词： 压铸铝合金 , 熔体处理 , 力学性能 , 断裂 , 腐蚀

Microstructure, mechanical properties and corrosion behavior of Al-Si-Cu-Zn-X (X=Bi, Sb, Sr) die cast alloy

Keywords： aluminium die cast alloy , melt treatment , mechanical properties , fracture , corrosion

研究经Bi、Sb和Sr改性的Al-11Si-2Cu-0.80Zn压铸铝合金的显微组织演变、力学性能和腐蚀行为.力学性能测试结果表明,Bi、Sb和Sr的添加引起合金中共晶Si形貌发生改变,从而使合金的冲击韧性、极限抗拉强度和伸长率增加.断裂表面分析结果表明,添加Sr或少量Bi和Sb,合金表面呈韧性断裂,而非准解理脆性断裂.此外,添加Sr、Bi和Sb后,合金的质量指标由基体合金的102 MPa分别增加到164.7 MPa、156.3 MPa和152.6MPa.在NaCl溶液中的极化腐蚀测试结果表明,分别添加Sb、Bi和Sr后,合金的腐蚀电位负移.浸泡腐蚀实验结果表明,由于Al和Si共晶相界面的增加,Sb、Bi和Sr元素的添加对合金的腐蚀速率具有决定性作用.

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