铸造技术2016，Vol.37Issue(8)：1562-1566,5.DOI:10.16410/j.issn1000-8365.2016.08.002
Si含量对Mg-8Al-8Zn-xSi合金组织与力学性能的影响
Effects of Si Content on Microstructure and Mechanical Properties of Mg-8Al-8Zn-xSi Alloys
摘要
Abstract
Mg-8A1-8Zn-xSi (x =1,2,4,mass％) magnesium alloys were prepared by the gravity casting.The effects of Si content on microstructure and mechanical properties of the alloys at both ambient and elevated temperature (150 ℃) were investigated.The results show that the as-cast microstructure consists of α-Mg matrix,β-Mg17Al12 phase,Mg2Si and MgZn phase.The morphology of Mg2Si particles in the Mg-8Al-8Zn-xSi alloys changes from the Chinese script type to the coarse skeleton-like with the increase of Si content.The average particles size of Chinese script type Mg2Si increases from 25 μm to 150 μm with the increase of Si content from 1％ to 4％,while the hardness of the alloys increases gradually with the increase of Si content.The ultimate tensile strength,yield strength and elongation of the alloys at both ambient and elevated temperature (150 ℃) increases with the increase of Si content from 1％ to 2％ and then decreases when increasing Si content to 4％.The fracture of the alloys are characterized by quasi-cleavage brittle mode.关键词
Mg-Al-Zn-Si合金/Mg2Si/显微组织/力学性能Key words
Mg-Al-Zn-Si alloy/Mg2Si/microstructure/mechanical property分类
金属材料引用本文复制引用
宋佩维,宋宇骅..Si含量对Mg-8Al-8Zn-xSi合金组织与力学性能的影响[J].铸造技术,2016,37(8):1562-1566,5.基金项目
陕西省自然科学基金资助项目(2010JM6009) （2010JM6009）
陕西省教育厅科研计划资助项目(2010JK470) （2010JK470）
