Mg-8Li-3Gd-3Y-0.6Al镁合金的均匀化研究

Homogenizing Annealing Research on Mg-8Li-3Gd-3Y-0.6Zr Magnesium Alloy

为了提高Mg-8Li-3Gd-3Y-0.6Al合金铸锭的力学性能,对合金进行了均匀化退火处理。通过金相显微镜、扫描电镜、显微硬度测试、X射线衍射、拉伸力学性能测试等手段,研究了均匀化条件对Mg-8Li-3Gd-3Y-0.6Al合金的显微组织和力学性能的影响。结果表明,铸态合金经773K 8h的均匀化处理后,铸态时的网状相完全溶解到基体中,第二相弥散分布在基体中,同时退火态合金的抗拉强度达到了154 MPa,比铸态合金提高了23%。合金最佳的均匀化退火工艺是773K 8h,此时该合金具有较好的综合力学性能。

In order to improve the mechanical properties of the cast ingot,homogenizing annealing treatment was carried out. The microstructure and mechanical properties of the alloy in different states were investigated by optical microscope,SEM,X-ray diffraction analysis,microhardness test and tensile mechanical properties test. The results show that after heat treatment at 773 K for 8 h,the network-like phases in cast alloy are completely dissolved into the matrix,and the second phases dispersive in the matrix. While the tensile strength of the annealed alloy reaches 154 MPa increasing by 23%,the optimal homogenization process is 773 K for 8 h,and the alloy has a better mechanical properties.