Achieving superior strength-ductility synergy in a heterostructured magnesium alloy via low-temperature extrusion and low-temperature annealing  

作　　者：H.Wang D.T.Zhang C.Qiu W.W.Zhang D.L.Chen 

机构地区：[1]Guangdong Key Laboratory for Advanced Metallic Materials Processing and Forming,National Engineering Research Center of Near-net-shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510640,China [2]Department of Mechanical and Industrial Engineering,Toronto Metropolitan University(formerly Ryerson University),350 Victoria Street,Toronto,ON M5B 2K3,Canada

出　　处：《Journal of Materials Science & Technology》2023年第32期32-44,共13页材料科学技术（英文版）

基　　金：the Key-Area Research and Development Program of Guangdong Province(No.2020B010186002);the Natural Science Foundation of Guangdong for Research Team(No.2015A030312003)。

摘　　要：A low-alloyed Mg-1.2Zn-0.1Ca(wt.%)alloy was fabricated via low-temperature extrusion and annealing at 250℃for different times(10,30,and 90 min)to attain heterostructures with different fine-grained fractions,focusing on the effect of heterostructure on the mechanical properties.Partial dynamic recrystallization(RX)occurred during extrusion at 150℃,and a lamellar structure consisting of fine RX grains and coarse unRX grains was obtained.The subsequent annealing promoted static RX in the as-extruded alloy,leading to an increased fine-grained fraction from 67%to 95%.Meanwhile,the co-segregation of Zn and Ca atoms impeded the migration of grain boundaries,thus achieving a fine grain size of 0.8–1.6μm.The sample annealed for 10 min with a fine-grained fraction of 73%and an average RX grain size of 0.9μm exhibited a superior combination of high yield strength(305 MPa)and good ductility(20%).In comparison,an excellent elongation of 30%was achieved in the alloy with a nearly fully-RXed microstructure and an average grain size of 1.6μm after 90 min annealing,despite a lower yield strength of 228 MPa.In unRX grains,the hard orientation with(01–10)parallel to the extrusion direction and high-density dislocations made it more difficult to deform compared with the RX grains,thus producing hetero-deformation induced(HDI)strengthening.Besides fine grains and high-density dislocations,HDI strengthening is the key to achieving the superior mechanical properties of the low-alloyed Mg alloy.

关 键 词：Low-alloyed magnesium alloy Low-temperature extrusion ANNEALING HETEROSTRUCTURE Mechanical properties 

分 类 号：TG139[一般工业技术—材料科学与工程]