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A Tem Study of the Dislocation Structure in a Ni3Al-Based Alloy at Temperatures Below the Peak in Flow Stress

Published online by Cambridge University Press:  26 February 2011

Mao Wen  and
Dongliang Lin
Mao Wen
Affiliation:
Department of Materials Science and Engineering,, Shanghai Jiao Tong University, Shanghai 200030, P.R.China
Dongliang Lin
Affiliation:
Department of Materials Science and Engineering,, Shanghai Jiao Tong University, Shanghai 200030, P.R.China
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Abstract

Dislocation structure in a directionally solidified Ni3Al-based alloy deformed at temperatures below the peak in flow stress has been studied by the weak beam TEM technique. At room temperature, the screw superdislocations are partly transformed into Kear-Wilsdorf configurations. With increasing temperatures, the transformed Kear-Wilsdorf parts increase until the temperature reaches 450°C, at which the screw superdislocations are wholly transformed. Bending of the Kear-Wilsdorf configurations on {0101} planes is observed at 450°C, which is believed to be the cause of interaction of Kear-Wilsdorf configurations with superkinks. The Contribution of superkink motion to deformation is discussed. The results suggest that deformation in this temperature range occurs primarily by the slip of non-screw components on {lll} planes, which is consistent with the widely accepted cross slip pinning model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 343
Copyright
Copyright © Materials Research Society 1991

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References

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