Mg-7Gd-5Y-1Nd-0.5Zr合金静态再结晶机理的研究  

Research on Static Recrystallization Mechanism of Mg-7Gd-5Y-1Nd-0.5Zr Alloy

作　　者：金承龙 袁家伟[2] 李蒙[2] JIN Chenglong, YUAN Jiawei, LI Meng(l.Southwest Aluminium （Group） Co., Ltd., Chongqing 401326, China; 2. General Research Institute for Non-Ferrous Metals Beijing 100088, China)

机构地区：[1]西南铝业集团有限责任公司,重庆401326 [2]北京有色金属研究总院,北京100088

出　　处：《热加工工艺》2018年第4期227-231,共5页Hot Working Technology

摘　　要：利用硬度测试、OM和原位观察等方法研究了Mg-7Gd-5Y-1Nd-0.5Zr（wt%）合金在退火过程中的静态再结晶机理。结果表明：合金退火1min后出现析出相回溶和静态再结晶现象,静态再结晶晶核优先在原始晶界上形成,在动态再结晶区域中产生亚晶界;在退火5 min后,亚晶迅速转变为静态再结晶晶核,同时有大量黑色析出相产生;进一步延长退火时间,静态再结晶过程十分缓慢,长时间退火后部分变形晶粒仍然存在;在传统退火处理中静态再结晶过程十分迅速,静态再结晶模型符合JMAK模型,并没有析出相产生;随着退火时间的延长,静态再结晶晶粒尺寸不断增大,微观组织不均匀性加剧;退火15 min后,硬度与平均晶粒尺寸之间服从Hall-Petch关系。The static recrystallization mechanism of Mg-7Gd-5Y-Ind-0.5Zr （wt%） alloy in the annealing process wasstudied by using hardness test, OM, in-situ observation and other methods. The results show that after annealing for 1 rain, thedissolution of the precipitated phase and the static recrystallization phenomenon occur, and the static recrystallizationnucleation preferentially forms in the original grain boundaries, and the sub-grain boundaries are produced in the dynamicrecrystallization region; after annealing for 5 rain, sub-grains quickly transforms into static recrystallization nucleation andthere are a lot of black precipitated phases; further extending the annealing time, the static recrystallization process is veryslow, partial de/brmed grains still exist in the microstructure; in the traditional annealing process, the static recrystallizationprocess is very rapid, the static recrystallization model is in accord with the JMAK model, and there is no precipitation; with theextension of annealing time, the ,wain size of static recrystallization increasc~ and the microstructure inhomogeneity aggravates;after annealing for 15 min, the relationship between the hardness and the average grain size obeys Hall-Petch relationship.

关 键 词：原位观察 动态再结晶 静态再结晶 

分 类 号：TG146.2[一般工业技术—材料科学与工程]