Abstract
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 resolu-tion 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 success-fully 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.
基金项目
Science and Technology Innovation Leading Talent of Hunan Province Project(2020RC4013)
"Technology Innovation 2025"Major Special Project of Ningbo City()
Grantin-Aid for Scientific Research(22246094)
Grantin-Aid for Scientific Research(21360348)
Research Activity Startup from JSPS,Japan(22860028)
NETL
NSTL
维普
万方数据