Achieving high ductility and strength in magnesium alloy through cryogenic-hot forming

作     者：Kai Zhang Zhutao Shao Joseph Robson Yan Huang Jinghua Zheng Jun Jiang 

作者机构：Department of Mechanical EngineeringImperial College LondonLondon SW72AZUK Department of Mechanical EngineeringUniversity College LondonLondon WC1E 7JEUK Department of MaterialsThe University of ManchesterManchester M13BBUK BCASTInstitute of Materials and ManufacturingBrunel University LondonUxbridge UB83PHUK College of Material Science and EngineeringNanjing University of Aeronautics and AstronauticsNanjing 211106China 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2023年第11卷第9期

页      面：3130-3140页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：the financial support from the President’s PhD Scholarship of Imperial College London the funding support by EPSRC under the Grant Agreement EP/R001715/1 on “Light Form: Embedding Materials Engineering in Manufacturing with Light Alloys” 

主　　题：Magnesium alloys Dynamic recrystallisation Twinning Cryogenic deformation 

摘      要：Magnesium alloys are the lightest structural alloys and have attracted substantial research attention in the past two decades. However, their mechanical properties, including ductility and strength, are limited after forming due to the formation of coarse grains and strong texture. This study proposes and proves a new cryogenic-hot forming process concept. Cryogenic deformation is imposed before the hot deformation. The effect of the cryogenic step has been compared with a conventional direct hot deformation process. The mechanical properties, microstructure,and texture of both the novel and conventional process routes have been compared. The cryogenic-hot deformed sample exhibits the highest ductility and fracture strength(ultimate tensile strength: 321 MPa, ductility: 21%) due to effective grain refinement and texture weakening by cryogenically formed twin-twin interaction induced recrystallisation. The proposed cryogenic-hot forming process can be a potential innovative manufacturing method for producing high-performance magnesium components.