Significantly improve the strength and ductility of AZ31 Mg alloy by introducing pure Ti  

作　　者：Xiang Chen Dabiao Xia Qixiang Jia Guangsheng Huang Weizhang Wang Junlei Zhang Heung Nam Han Fusheng Pan 

机构地区：[1]College of Materials Science and Engineering,Hubei University of Automotive Technology,Shiyan 442002,China [2]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China [3]Jihua Laboratory,Foshan 528000,China [4]College of Intelligent Equipment,Shandong University of Science and Technology,Tai’an 271000,China [5]College of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China [6]Department of Materials Science and Engineering,Seoul National University,Seoul,08826,Republic of Korea

出　　处：《Journal of Materials Science & Technology》2024年第18期69-82,共14页材料科学技术（英文版）

基　　金：supported by the National Key Research and Development Program(No.2021YFB3701000);National Natural Science Foundation of China(Nos.52071035 and U2037601);Yunnan Fundamental Research Projects(No.202201BE070001–014);Heung Nam Han is supported by the National Research Foundation of Korea(NRF)Grant funded by the Korean Government(MSIP)(No.2020R1A5A6017701).

摘　　要：In this work,we introduced pure Ti into AZ31 Mg alloy by extrusion process followed by annealing at 350℃ for 1 h to significantly improve the mechanical properties of AZ31 laminate,with a yield strength of 243 MPa,an ultimate tensile strength of 338 MPa and a uniform elongation of 17.7%.Microstructural characterizations showed that there was slight diffusion of elements(Al,Zn,and Mn)across the layer interface,and the interface between the constituent layers maintained semi-coherent.Moreover,signifi-cant microstructure heterogeneities appeared across the hetero-interface,where the Mg layer possessed large equiaxed grains with lower dislocation density,while the Ti layer formed ultrafine grains(UFG)and unrecrystallized block grains with extensive dislocation cells and dislocation walls.Combining the digital image correlation(DIC)technique and in-situ electron backscatter diffraction(EBSD),it was found that the microstructural heterogeneities induced significant strain gradients near the layer interface during plastic deformation,which needed to be accommodated by geometrically necessary dislocations(GNDs).This resulted in hetero-deformation-induced(HDI)strengthening and HDI strain hardening to strengthen and toughen the AZ31 laminated composite.Additionally,the introduction of the Ti layer effectively hin-dered the propagation of the cracks and consequently improved the ductility of the laminate.

关 键 词：AZ31 laminated composite EXTRUSION ANNEALING Strain gradient Mechanical properties 

分 类 号：TG146.21[一般工业技术—材料科学与工程]