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　　采用多向鍛造（MDF）和擠壓（EX）相結合工藝對TiC納米顆粒增強Mg-4Zn-0.5Ca基納米復合材料進行變形。與僅單一MDF相比,經(jīng)MDF+EX變形后納米復合材料的晶粒尺寸顯著減小。當MDF溫度為270°C時,隨MDF道次的增加,經(jīng)EX變形后再結晶（DRX）晶粒的平均尺寸逐漸增大;而當MDF溫度為310°C時,經(jīng)EX變形后DRX晶粒的平均尺寸顯著減小。經(jīng)MDF+EX多步變形后納米復合材料中同時出現(xiàn)細小和粗大的MgZn₂相,這些MgZn₂相的體積分數(shù)隨EX前MDF道次的增加而逐漸增大。對溫度為310°C經(jīng)3道次MDF后的納米復合材料進行EX,其屈服強度、極限抗拉強度和伸長率分別達到～404 MPa,～450.3 MPa和～5.2%。這主要與MDF+EX多步變形后晶粒細化強化及MgZn₂析出相引起的Orowan強化有關。 

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

【文章頁數(shù)】：19 頁

【文章目錄】：
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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