Dynamic microstructure evolution and mechanical properties of dilute Mg-Al-Ca-Mn alloy during hot rolling  

作　　者：Shiwei Xu Congcong Zhu Zhanhong Lin Chen Jin S.Kamado K.Oh-ishi Yun Qin 

机构地区：[1]College of Materials Science and Engineering,Hunan University,Changsha 410082,China [2]State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China [3]Qinghai Salt Lake Teli Magnesium Co.Ltd.,Xining 810000,China [4]Department of Mechanical Engineering,Nagaoka University of Technology,Nagaoka 940-2188,Japan [5]Toyota Central R&D Labs.,Inc.,41-1 Yokomichi,Nagakute,Aichi 480-1192,Japan [6]Research Institute(R&D Centre),Baowu Steel Group Corporation,Shanghai 201900,China

出　　处：《Journal of Materials Science & Technology》2022年第34期1-14,共14页材料科学技术（英文版）

基　　金：supported financially by the Science and Technology Innovation Leading Talent of Hunan Province Project (No.2020RC4013);“Technology Innovation 2025” Major Special Project of Ningbo City;partially supported by Grantin-Aid for Scientific Research (No. 22246094);Grant-in-Aid for Scientific Research (No. 21360348);Research Activity Start-up (No.22860028) from JSPS,Japan。

摘　　要：The dynamic microstructure and texture of dilute Mg-0.50Al-0.71Ca-0.33Mn(wt.%) during hot rolling at two slab temperatures were investigated by electron backscattered diffraction(EBSD) and high resolution transmission electron microscopy(HRTEM). The results show that the development of the rolling microstructures is to first form {10–12} extension twins in the original grains, thereby forming the extension-twinned regions, and then to further form {10–11}-{10–12} double twins and kinks in the extension-twinned regions, and finally to form continuous dynamic recrystallized(continuous DRXed)grains in the double twins and the cross parts of the shear-deformed coarse extension-twinned regions.These extension twins, double twins and kinks show a decisive effect on the formation of rolling texture.The number of {10–11}-{10–12} double twins and resultant the continuous DRX process are strongly affected by the rolling slab temperature and the reduction thickness per pass. By optimizing the rolling conditions, texture and microstructures of the multi-pass rolled Mg-Al-Ca-Mn alloy sheets are successfully modified. Although the total alloy content is only 1.5 wt.%, these Mg-Al-Ca-Mn alloy sheets show much higher strength than the commercial Mg-3Al-1 Zn(wt.%)(AZ31B) sheet.

关 键 词：Mg-Al-Ca-Mn alloy Hot rolling Dynamic recrystallization Texture control Mechanical properties 

分 类 号：TG335.11[金属学及工艺—金属压力加工]