快凝块体镁合金的制备及准静态力学性能研究  

Synthesis and characterization of rapidly solidified magnesium alloy

作　　者：李洁琼[1,2] 王鲁[1] 程焕武[1] 吕广庶[1] 张海峰[3] 王爱民[3] 

机构地区：[1]北京理工大学材料科学与工程学院 [2]中国科学院金属研究所,辽宁沈阳110015 [3]中国科学院金属研究所

出　　处：《兵器材料科学与工程》2008年第3期5-8,共4页Ordnance Material Science and Engineering

基　　金：国家自然科学基金项目资助(50274064)

摘　　要：采用铜模浇铸法成功制备快凝块体镁合金,并对铸态镁合金和快凝镁合金的组织结构和准静态力学性能进行对比研究。结果表明,快速冷却技术使得镁合金的显微组织得到有效细化,"相的形态由铸态合金中的连续网状转变为非连续细小粒状;快凝镁合金的压缩断裂强度高达494MPa,比铸态镁合金提高77%。Rapidly solidified magnesium alloy was synthesized successfully by copper mould casting. Microstructure and the mechanical properties of conventional casting alloy and rapidly solidified alloy were studied contrastively. Microstructure of rapidly solidified AZ91HP alloy was greatly refined through the process of rapid solidification compared with that of as-cast AZ91HP alloy. The morphology of brittle β-Mg17Al12 phase in rapidly solidified magnesium was granular instead of reticular in conventional casting alloy. Rapidly solidified magnesium demonstrates higher compressive fracture strength of 494 MPa, increased by 77 percent compared to conventional casting alloy.

关 键 词：AZ91HP镁合金 快速凝固 显微组织 力学性能 断裂强度 

分 类 号：TG146.22[一般工业技术—材料科学与工程]