论文部分内容阅读
通过进行显微组织观察与室温拉伸性能测试,研究了热挤压Mg-5%Zn-0.6%Zr-3%Gd合金的显微组织及拉伸性能。结果表明,随着挤压比的增大,热挤压期间动态再结晶效应增强,合金的抗拉强度、屈服强度以及伸长率增大;经过时效处理后,合金中析出细小的第二相粒子,合金的屈服强度与伸长率的提高幅度较大,而抗拉强度略有提高。拉伸断口形貌观察与分析表明,挤压态和热处理态Mg-5%Zn-0.6%Zr-3%Gd合金的断裂方式都是脆性和韧性混合断裂,前者以脆性断裂为,后者以韧性断裂为主。
The microstructure and tensile properties of hot-extruded Mg-5% Zn-0.6% Zr-3% Gd alloy were investigated by microstructure observation and tensile testing at room temperature. The results show that with the increase of extrusion ratio, the dynamic recrystallization effect increases during hot extrusion, the tensile strength, yield strength and elongation of the alloy increase. After aging treatment, the alloy precipitates fine second phase The yield strength and elongation of the particles and the alloy increase a lot, but the tensile strength slightly increases. The observation and analysis of tensile fracture morphology showed that the fracture modes of Mg-5% Zn-0.6% Zr-3% Gd alloy in both as-extruded and as-treated Mg-5% Zn-0.6% Zr-3% Gd alloys were brittle and ductile mixed fracture, Toughness-based fracture.