Zr对Al-Si-Mg-Mn合金凝固过程、时效组织和性能的影响  

Effect of Zr on Al⁃Si⁃Mg⁃Mn Alloy Solidification Process and Its Microstructure and Properties After Aging Treatment

作　　者：陈安柱[1] 周鹏飞[1] CHEN Anzhu;ZHOU Pengfei(School of Automotive and Transportation,Yancheng Polytechnic College,Yancheng 224005,Jiangsu,)

机构地区：[1]盐城工业职业技术学院汽车与交通学院,江苏盐城224005

出　　处：《矿冶工程》2024年第3期156-160,165,共6页Mining and Metallurgical Engineering

基　　金：2022年度国家外国专家项目(G2022014146L);2022年度江苏省高校基础科学自然科学面上项目(22KJD430011);江苏省产学研合作项目(BY2022482,BY2022472,2021HX⁃67);2022江苏高校“青蓝工程”;2019、2020校级自然科学基金(ygy2019⁃04,ygy2004);2019校级创新团队项目(YGYKT⁃04)。

摘　　要：通过模拟计算、组织观察以及力学性能测试,研究了不同Zr含量对铸造Al-Si-Mg-Mn合金凝固过程、时效组织及力学性能的影响。结果表明,随着Zr含量增加,合金凝固路径存在显著差异,晶粒由初期树枝晶逐步演变为等轴晶;175℃时效7 h条件下,Zr的加入显著提高合金硬度。Zr的加入促使析出相在更低时效温度析出,这可能是Zr细化了晶粒从而提高了扩散效率。峰值时效时合金主要析出相为β″相和Q′相。The effects of Zr content on solidification process of Al-Si-Mg-Mn alloy,and its microstructure and mechanical properties after aging treatment were investigated by means of numerical simulation,microstructure observation and mechanical property testing.The research results reveal that with increasing Zr content,the solidification path of the alloy become significantly different,and grains evolve from initial dendrites to equiaxed grains.After aging treatment at 175℃for 7 h,an addition of Zr can significantly improve the hardness of the alloy.The addition of Zr promotes the precipitation of precipitates at lower aging temperature,which may be attributed to grain refinement of Zr,thus leading to improved diffusion efficiency.The main precipitates of the alloy areβ″phase and Q′phase during peak aging.

关 键 词：铝合金 轻量化 析出强化 晶粒细化 ZR Al-Si-Mg-Mn 时效 析出相 组织形貌 

分 类 号：TB302[一般工业技术—材料科学与工程]