联合多向锻造与挤压变形TiC纳米颗粒增强Mg-Zn-Ca基复合材料的组织与力学性能（英文）

发布时间：2021-11-25 10:36

　　采用多向锻造（MDF）和挤压（EX）相结合工艺对TiC纳米颗粒增强Mg-4Zn-0.5Ca基纳米复合材料进行变形。与仅单一MDF相比,经MDF+EX变形后纳米复合材料的晶粒尺寸显著减小。当MDF温度为270°C时,随MDF道次的增加,经EX变形后再结晶（DRX）晶粒的平均尺寸逐渐增大;而当MDF温度为310°C时,经EX变形后DRX晶粒的平均尺寸显著减小。经MDF+EX多步变形后纳米复合材料中同时出现细小和粗大的MgZn₂相,这些MgZn₂相的体积分数随EX前MDF道次的增加而逐渐增大。对温度为310°C经3道次MDF后的纳米复合材料进行EX,其屈服强度、极限抗拉强度和伸长率分别达到～404 MPa,～450.3 MPa和～5.2%。这主要与MDF+EX多步变形后晶粒细化强化及MgZn₂析出相引起的Orowan强化有关。 

【文章来源】：Transactions of Nonferrous Metals Society of China. 2020,30(09)EISCICSCD

【文章页数】：19 页

【文章目录】：
1 Introduction
2 Experimental
    2.1 Materials
    2.2 Multi-step deformation
    2.3 Microstructural characterization
    2.4 Tensile properties
3 Results
    3.1 Microstructures of Ti Cp/Mg-4Zn-0.5Ca nanocomposites after MDF270 and MDF270+EX processing
    3.2 Microstructures of Ti Cp/Mg-4Zn-0.5Ca nanocomposites after MDF310 andMDF310+EX
    3.3 Tensile properties of Ti Cp/Mg-4Zn-0.5Ca nanocomposites after (MDF+EX) multi-step deformation
4 Discussion
    4.1 Microstructures of nanocomposites after MDF+EX multi-step deformation
    4.2 Tensile properties
    4.3 Influence of deformation processing on microstructure and mechanical properties
5 Conclusions


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