Sb对AM50-Y镁合金组织和力学性能的影响

研究合金元素Sb对AM50-Y合金显微组织和力学性能的影响。结果表明,加入Sb后,合金晶粒明显细化,同时形成弥散分布的YSb相。YSb相作为异质形核核心,促进了细小弥散分布的Al2Y颗粒相的形成。随着Sb含量的增加,合金室温和150℃高温抗拉强度、延伸率及室温冲击韧性先上升后下降。当Sb含量为0.6%时,合金综合力学性能最好:合金室温抗拉强度、延伸率和冲击韧性分别为257MPa、9.9%和26J·cm-2,与未添加Sb合金相比分别提高了13.7%、15.9%和14.9%;合金的高温抗拉强度和延伸率达到203MPa和11.9%,分别提高了12.8%和15.5%。

Effects of Sb on Microstructure and Mechanical Properties of AM50-Y Magnesium Alloy

The effects of Sb on microstructure and mechanical properties of AM50-Y magnesium alloys have been studied. The results show that after Sb is added into the AM50-Y alloy, the grains are refined obviously and a few dispersed?phases YSb are formed, which promote the formation of fine, dispersed?Al2Y particles by providing the nucleation sites. With increasing of Sb content, the tensile strength and elongation at room temperature and at 150 °C, and the impact toughness at room temperature of the alloys increase first, and then decrease. When the content of Sb is up to 0.6%, the tensile strength, elongation and impact toughness at room temperature reach their maxima simultaneously of 257 MPa, 9.9% and 26 J·cm-2, increased by 13.7%, 15.9% and 14.9% respectively compared with the alloy without Sb addition. Meanwhile, the tensile strength and elongation at 150 °C reach their maxima of 203 MPa and 11.9%, increased by 12.8% and 15.5% respectively, showing the best combined mechanical properties