摘要
采用自制的雾化-激冷设备,用快速凝固粉末冶金方法制备了Si增强AZ91镁基复合材料,分别对材料进行光学金相、XRD、显微硬度、拉伸性能以及SEM分析。结果表明:增强相在基体中分布均匀,在挤压过程中增强相与基体发生了反应,形成反应层,反应层中存在高温相Mg2Si。复合材料的室温δ、σb、σ0.2分别为3.50%、322.35 MPa和241.60 MPa。随着Si含量的提高,该复合材料的性能明显下降。该复合材料表现出较好的高温性能,423 K时,其δ、σb、σ0.2分别为5.2%、302 MPa和227 MPa。
Rapidly solidified（RS） AZ91 magnesium alloy powders and the Mg-based composite material reinforced by Si particles were produced by twin-roller atomization method and powder metallurgy,respectively.The OM,XRD,micro-hardness,mechanical properties and SEM of the materials were investigated.The results show that the reinforcement distributes homogeneously in matrix.The reaction between reinforcement and matrix occur phase and the reaction layer forms,in which high temperature stable phases Mg2Si existe.The composite exhibits better mechanical properties,the roomtemperature δ,σb,σ0.2 are 3.50%,322.35 MPa and 241.60 MPa,respectively.The properties of the material are deteriorated with the increase of Si content.The composite material exhibits excellent elevated temperature properties.The δ,σb and σ0.2 at 423 K are 5.2%,302 MPa,227 MPa,respectively.
出处
《热加工工艺》
CSCD
北大核心
2012年第10期125-128,共4页
Hot Working Technology
关键词
快速凝固
粉末冶金
力学性能
rapidly solidified
powder metallurgy
mechanical properties
