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li zi shen dan ceng -fe4n xiang nei wei cuo huan he ceng cuo lei xing de jian bie
Pages: 60-64
Year: Issue:  4
Journal: Transactions of Materials and Heat Treatment

Keyword:  plasma nitriding\ γ′ Fe\-4N phase\ dislocation loop\ stack fault;
Abstract: The dislocation in γ′ Fe\-4N phase in the plasma nitrided layer and the imperfect dislocations on either side of the stack faults have been analyzed and determined by TEM diffraction method. The results show that the dislocation loops with b=1/3[111] are vacancy typed, the forming reason is that during the process of plasma nitriding the continuous bombardment of high energy ions lead to the formation of a great deal of point defects vacancies, Some of vacancy flakes are formed by gathering of the vacancies, and finally collapse develops into dislocation loops. However, stack faults are vacancy typed, the imperfect dislocation on either side of stack faults are a type of Shocklay imperfect dislocations with Burgers vector b=1/6〈112〉.
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