CAJ | 학술논문

对挤压态AZ31镁合金试样沿挤压方向截取试样(0°试样)和垂直于挤压方向截取试样(90°试样)，并分别进行变形量为12%的冷锻变形，在320℃下保温不同时间进行再结晶退火。利用金相显微镜和背散射电子衍射技术研究AZ31镁合金的微观组织演变。结果表明：经冷锻变形的0°试样，内部存在大量细小碎晶、{1011}?{1012}、{1013}和{1013}?{1012}等孪晶，平均小角度取向差频率为0.031，硬度由57HV 增至71.3HV，随后的再结晶退火可显著细化原始混晶组织；经冷锻变形的90°试样，内部含有少量的{1011}?{1012}二次孪晶，平均小角度取向差频率为0.017，硬度由57HV增至69.3HV，再结晶退火时，与0°试样对比，静态再结晶开始及结束时间均被推迟。
대제압태AZ31미합금시양연제압방향절취시양(0°시양)화수직우제압방향절취시양(90°시양)，병분별진행변형량위12%적랭단변형，재320℃하보온불동시간진행재결정퇴화。이용금상현미경화배산사전자연사기술연구AZ31미합금적미관조직연변。결과표명：경랭단변형적0°시양，내부존재대량세소쇄정、{1011}?{1012}、{1013}화{1013}?{1012}등련정，평균소각도취향차빈솔위0.031，경도유57HV 증지71.3HV，수후적재결정퇴화가현저세화원시혼정조직；경랭단변형적90°시양，내부함유소량적{1011}?{1012}이차련정，평균소각도취향차빈솔위0.017，경도유57HV증지69.3HV，재결정퇴화시，여0°시양대비，정태재결정개시급결속시간균피추지。
0 ° and 90° samples of extruded AZ31 magnesium alloys were obtained from cutting along the extrusion direction and perpendicular to the extrusion direction, respectively, and 12%cold forging deformation was carried out on them, then recrystallization annealing tests were performed at 320℃ for different durations. The microstructure evolution of AZ31 magnesium alloys was investigated by metalloscopy and electron backscatter diffractometry. The results show that in 0° sample there are a large amount of tinny broken grains,{10 1 1}?{10 1 2},{10 1 3}and{10 1 3}?{10 1 2}, the average frequency of low angle grain boundary is 0.031, and the hardness increases from 57HV to 71.3HV. Besides, original mischcrystal structure can be refined obviously by subsequent recrystallization annealing. As for 90° sample, only a few of{10 1 1}?{10 1 2}double twins come out, the average frequency of low angle grain boundary is 0.017, and the hardness increases from 57HV to 69.3HV. By comparison with that of 0° sample, the starting and ending times of static recrystallization for 90° sample are delayed during the recrystallization annealing process.