论文部分内容阅读
采用扫描电镜、万能电子试验机和HVS-5Z/LCD维氏硬度计分析测试了Al-1B变质处理前后Zn-6Al-3Mg合金的凝固组织与力学性能。研究表明:变质剂加入量和变质温度对Zn-6Al-3Mg合金的凝固组织中Al-fcc相、Mg Zn2相和Zn-hcp相以及二元Zn/Al和三元Zn/Al/Mg Zn2共晶体的形态和体积分数有明显影响。当Al-1B加入量为0.3 mass%时,Zn-6Al-3Mg合金的抗拉强度、硬度和伸长率都达到最大值。当变质剂加入量相同时,随着变质温度的升高,Zn-6Al-3Mg合金的抗拉强度和伸长率提高;在450℃变质处理时,Zn-6Al-3Mg合金的硬度最高,550℃变质处理后该合金的硬度最低。
The microstructure and mechanical properties of Zn-6Al-3Mg alloy before and after Al-1B modification were tested by scanning electron microscopy, universal testing machine and HVS-5Z / LCD Vickers hardness tester. The results show that Al-fcc phase, Mg Zn2 phase and Zn-hcp phase and binary Zn / Al and ternary Zn / Al / Mg Zn2 in the solidified microstructure of Zn-6Al-3Mg alloy Crystal morphology and volume fraction have a significant impact. When the amount of Al-1B is 0.3 mass%, the tensile strength, hardness and elongation of Zn-6Al-3Mg alloy reach the maximum. When the amount of modifier added is the same, the tensile strength and elongation of Zn-6Al-3Mg alloy increase with the increasing of metamorphic temperature. The hardness of Zn-6Al-3Mg alloy is the highest at 550 ℃ The deterioration of the alloy after the lowest hardness.