Variations in microstructure and bending formability of extruded Mg–Al–Zn–Ca–Y–MM alloy with precompression and subsequent annealing treatment conditions  

作　　者：Jong Un Lee Sang-Hoon Kim Dong Hee Lee Hyun Ji Kim Young Min Kim Sung Hyuk Park 

机构地区：[1]School of Materials Science and Engineering,Kyungpook National University,Daegu 41566,Republic of Korea [2]Agency for Defense Development,Daejeon 34186,Republic of Korea [3]Implementation Research Division,Korea Institute of Materials Science,Changwon 51508,Republic of Korea

出　　处：《Journal of Magnesium and Alloys》2022年第9期2475-2490,共16页镁合金学报（英文）

基　　金：supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government(MSIP, South Korea,No. 2019R1A2C1085272)。

摘　　要：In this study, the bending formability of an extruded Mg–9Al–1Zn–0.3Mn–0.9Ca–0.6Y–0.5 MM(AZXWMM91100, wt%) alloy at room temperature is significantly improved through application of a combined precompression and subsequent annealing(PCA) treatment. As the amount of precompression applied along the extrusion direction(ED)(i.e., the total strain) increases from 4% to 6%, the area fraction of ED-oriented grains of the PCA-treated alloy increases, which consequently causes an improvement in its bending formability because these grains accommodate larger tensile strain along the ED during bending. As the temperature of the subsequent annealing treatment increases from 350 ℃ to 450 ℃, both the area fraction of the ED-oriented grains and the average grain size increase, and the residual dislocation density decreases owing to the promotion of boundary migration and occurrence of the recovery process at higher temperatures.Consequently, the bending formability of both the 4%-precompressed and the 6%-precompressed samples increases with an increase in the annealing temperature. However, when the precompressed samples are annealed at 300 ℃, their bending formability is lower than that of the extruded alloy because the dislocations formed by precompression remain even after the subsequent annealing at this temperature.

关 键 词：MAGNESIUM EXTRUSION BENDING FORMABILITY Texture 

分 类 号：TG146.22[一般工业技术—材料科学与工程]