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β黄铜中贝氏体生长的高温动态研究

杨延清 , 刘东慧 , 康沫狂 , 孙原

金属学报

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。

关键词: β黄铜 , bainite , growth kinetics , shear , volume diffusion

HIGH-TEMPERATURE TEM IN SITU STUDY OF GROWTH KINETICS OF BAINITE IN β BRASS

YANG Yanqing LIU Donghui KANG Mokuang Northwestern Polytechnical University , Xi'an , ChinaSUN Yuan Beijing Centre of Physical and Chemical Analysis , Beijing , China

金属学报(英文版)

In situ observation of the growth process of bainitic plate in βbrass by means of high-temper- ature TEM is conducted.The lengthening and thickening kinetics of bainitic plate is analysed with Trivedi's model and Zener-Hillert's model,respectively.It is found that the stacking fault substructure exists just in the growth tip of fresh bainitie plate and so does the shear stress in the matrix around the tip.The measured lengthening rate of bainitic plate is not con- sistent with Trivedi's model.The thiekening process is only macroscopieally controlled by vol- ume diffusion but its nature is a shear process.

关键词: β-brass , null , null , null , null

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