Nanoscale analysis of interfacial structure and its effects on mechanical properties of Mg/Al laminate reinforced by TiB_(2) particles  

作　　者：Lihua Qian Liang Chen Biaohua Que Kaiqiang Shen Guoqun Zhao Cunsheng Zhang 

机构地区：[1]Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education),Shandong University,Jinan,Shandong 250061,PR China

出　　处：《Journal of Magnesium and Alloys》2025年第3期1310-1324,共15页镁合金学报(英文)

基　　金：supports from the National Natural Science Foundation of China(52175338 and 52222510);Science Fund for Distinguished Young Scholars of Shandong Province(ZR2021JQ21);Key Research and Development Program of Shandong Province(2021ZLGX01).

摘　　要：Fabricating Mg/Al laminate is an effective strategy to circumvent the inherently low formability and poor corrosion resistance of Mg alloys.Here,Mg/Al laminate with good bonding quality and mechanical properties was successfully fabricated via porthole die co-extrusion process using ZK60 Mg and TiB2/6061Al composite as constituted layers.Integrating the results from microstructural characterization and mechanical testing,the effects of extrusion temperature on microstructure,interfacial structure,element diffusion,and mechanical properties were investigated.The results show that Mg/Al laminate achieves a sound welding quality by mechanical bonding and diffusion bonding.The obvious intermetallic compounds(βandγ)layer forms at Mg/Al interface,and its thickness increases to 8.3μm as the extrusion temperature reaches 400°C.High extrusion temperature promotes the dynamic recrystallization and grain growth of Mg and Al layers,while the dislocation density decreases.β/γinterface shows a coherent feature,whileγ/Mg interface is semi-coherent with a locally ordered transition zone of 4.5 nm.The rich Mg and Cr layers are found at TiB2/6061 interface,which is conducive to improving the bonding quality.When the extrusion temperature is 370°C,the thickness of diffusion layer is around 5.0μm,and the bonding strength reaches 18.68 MPa,resulting in the best comprehensive mechanical properties.This work provides a new direction for the development of Mg/Al laminate with excellent strength and ductility.

关 键 词：Mg/Al EXTRUSION Microstructure Interface Dislocation density 

分 类 号：TG146.2[一般工业技术—材料科学与工程]