Improvement of strength and ductility synergy in a room-temperature stretch-formable Mg-Al-Mn alloy sheet by twin-roll casting and low-temperature annealing

作     者：T.Nakata C.Xu K.Kaibe Y.Yoshida K.Yoshida S.Kamado 

作者机构：Nagaoka University of Technology1603-1KamitomiokaNagaoka 940-2188Japan School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Sumitomo Electric IndustriesLtd.1-1-1 KoyakitaItami 664-0016Japan 

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

年 卷 期：2022年第10卷第4期

页      面：1066-1074页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 080201[工学-机械制造及其自动化] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by JSPS KAKENHI Grant Numbers JP19K15321,JP18H03837 The Amada Foundation(AF2019037-C2) Advanced Low Carbon Technology Research and Development Program(ALCA),12102886 National Natural Science Foundation,Grant Number 51971075 Nagaoka University of Technology(NUT)Presidential Research Grant. 

主　　题：Magnesium Rolling Tensile property Room temperature formability Twinning 

摘      要：Strength and ductility synergy in an Mg-3mass%Al-Mn(AM30)alloy sheet was successfully improved via twin-roll casting and annealing at low-temperature.An AM30 alloy sheet produced by twin-roll casting,homogenization,hot-rolling,and subsequent annealing at 170℃ for 64 h exhibits a good 0.2%proof stress of 170 MPa and a large elongation to failure of 33.1%along the rolling direction.The sheet also shows in-plane isotropic tensile properties,and the 0.2%proof stress and elongation to failure along the transverse direction are 176 MPa and 35.5%,respectively.Though the sheet produced by direct-chill casting also shows moderate strengths if the annealing condition is same,the direct-chill casting leads to the deteriorated elongation to failure of 23.9%and 30.0%for the rolling and transverse directions,respectively.As well as such excellent tensile properties,a high room-temperature stretch formability with an Index Erichsen value of 8.3 mm could be obtained in the twin-roll cast sheet annealed at 170℃ for 64 h.The annealing at a higher temperature further improves the stretch formability;however,this results in the decrease of the tensile properties.Microstructure characterization reveals that the excellent combination of strengths,ductility,and stretch formability in the twin-roll cast sheet annealed at the low-temperature annealing is mainly attributed to the uniform recrystallized microstructure,fine grain size,and circular distribution of(0001)poles away from the normal direction of the sheet.