摘要
采用工程化半连续铸造制备Al-Zn-Mg铝合金铸锭并挤压,借助Gleeble热拉伸、常温拉伸实验以及金相电镜、扫描电镜、透射电镜研究了不同Zr含量对含微量Ti的Al-Zn-Mg合金微观组织与力学性能的影响。结果表明,Zr元素显著细化该铸锭晶粒,改善铸锭径向晶粒尺寸不均匀性,抑制挤压组织再结晶;Zr元素还能提高材料的高温强度,但随着温度升高,提高效果减弱。Zr含量为0.157%时,形成了粗大的初生相Al3(Zr,Ti)相,该粗大第二相对合金性能产生了不利影响;Zr含量为0.196%时,Zr聚集现象更明显,形成了数量更多的粗大Al3Zr相。
Al-Zn-Mg aluminum alloy ingots were manufactured by semi-continuous and extruded, the effects of different Zr content on the microstructure and mechanical properties of Al-Zn-Mg alloy with trace Ti were investigated by Gleeble hot and normal tensile test, OM, SEM, TEM. The results show that Zr element significantly refine the grain size, improve the radial grain size inhomogeneity of ingot and inhibit the recrystallization of extruded microstructure. Zr element can increase the high temperature strength, but the elevation effect is weakened when the temperature rises. When Zr content is 0.157%,coarse primary phase Al3(Zr, Ti) phase forms, which has an adverse effect on the properties of the alloy. When Zr content is 0.196%, the gathered phenomenon of Zr element is more obvious, and a large number of corase Al3Zr phase appears.
作者
王艳玲
马云龙
黄元春
章强
谭维杨
WANG Yanling;MA Yunlong;HUANG Yuanchun;ZHANG Qiang;TAN Weiyan(School of Light Alloy Institute, Central South University, Changsha 410083, China;Beijing Institute of Aerospace Systems Engineering, Beijing 100076, China)
出处
《热加工工艺》
北大核心
2019年第12期40-45,49,共7页
Hot Working Technology
基金
国家重点基础研究发展“973”计划项目(2014CB046702)
