本文运用透射电镜对β黄铜贝氏体片生长进行了高温原位动态研究,并运用体扩散控制生长的Trivedi模型及Zener—Hillert模型分别对贝氏体片的伸长和加厚进行了分析,发现在贝氏体片的初期生长尖端即存在层错亚结构和切变应力场,贝氏体片的实际伸长速率不符合Trivedi模型,加厚仅在宏观上表现为受体扩散所控制,其实质仍为一切变过程。
In situ observation of the growth process of bainitic plate in β brass by means ofhigh--temperature TEM is conducted. The lengthening and thickening kinetics of bainitic plateis analysed with Trivedi's model and Zener--Hillert's model, respectively. It is found that thestacking fault substructure exists just in the growth tip of fresh bainitic plate and so does theshear stress in the matrix around the tip. The measured lengthening rate of bainitic plate is notconsistent with Trivedi's model. The thickening process is only macroscopically controlled byvolume diffusion but its nature is a shear process.
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