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Abstract 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 (benefici al) effect,improvement on oxidation resistance of metals,(2) in contradiction,ne gative (deleterious) effect,and (3) dual effect.The influences of parameters of fundamental equation of grain boundary diffusion,such as Tammantem perature and influence of grain size on it， factor of grain shape (q)、fact or of GB segregation (s)、grain boundary angle (θ) on the grain boundar y diffusion were discussed,Finally,the importance of grain boundary acted as hig h velocity diffusivity pathways in the intergranular internal oxidation was intr oduced.
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Received: 14 March 2002
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Corresponding Authors:
Tiefan Li
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