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In-Situ Heating Observations on Superlattice Dislocation in A Ni3(Al, Zr) Single Crystal

Published online by Cambridge University Press:  22 February 2011

Yi Liu ,
Yuefeng Gu ,
Dongliang Lin ,
Shipu Chen ,
Xiaoning Zhao  and
Jianming Hong
Yi Liu
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P.R. China Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008, P.R. China
Yuefeng Gu
Affiliation:
Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008, P.R. China
Dongliang Lin
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P.R. China
Shipu Chen
Affiliation:
Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, P.R. China
Xiaoning Zhao
Affiliation:
Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008, P.R. China
Jianming Hong
Affiliation:
Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008, P.R. China
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Abstract

The TEM weak-beam technique has been used to investigate the behavior of dissociated superlattice dislocation in Ni3Al single crystal as a function of temperature. The observed dislocation with the Burgers vector of [110] partly dissociated on the (001) plane forming Kear-Wilsdorf (KW) lock. The dissociated pair did not indicate significant variation of separation in the temperature range from room temperature to 773K. but turned to form a jog at 773K. At 898K, which is near the peak temperature, the dissociated segment constricted completely. The experimental observations are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 321
Copyright
Copyright © Materials Research Society 1995

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