摘要
扼要阐述了金属材料晶界在纯金属与合金高温氧化中的作用 .指出金属中晶界面积增加 (晶粒尺寸减小 )有3种效应 :改善合金抗氧化性能的有益的正效应 ,相反为负效应以及双重效应 .讨论了金属晶界扩散动力学基本方程的参数 ,如Tamman温度及晶粒尺寸对其影响、晶粒形状因子 (q)、晶界偏聚因子 (s)、晶界夹角 (θ)对晶界扩散的影响 .
This paper explains the role of metallic materials grain boundary in high temperature oxidation behaviour of pure metals and alloys in brief.There are three effects concerned of increased metallic materials grain boundary area (e.g.decreased grain size):(1) positive (beneficial) effect,improvement on oxidation resistance of metals,(2) in contradiction,negative (deleterious) effect,and (3) dual effect.The influences of parameters of fundamental equation of grain boundary diffusion,such as Tamman temperature and influence of grain size on it, factor of grain shape ( q )?factor of GB segregation ( s )?grain boundary angle ( θ ) on the grain boundary diffusion were discussed,Finally,the importance of grain boundary acted as high velocity diffusivity pathways in the intergranular internal oxidation was introduced.
出处
《中国腐蚀与防护学报》
CAS
CSCD
2002年第3期180-183,共4页
Journal of Chinese Society For Corrosion and Protection
关键词
金属
晶界扩散
晶粒尺寸
晶间内氧化
grain boundary diffusion in metals,grain size,oxidation behavior,intergranular internal oxidation
