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Proton Irradiation-induced Disordering Reactions, Ductility and Strengthening of Ni3Al

Published online by Cambridge University Press:  26 February 2011

J. Cheng ,
C.-S. Lee ,
C. N. J. Wagner  and
A. J. Ardell
J. Cheng
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, CA 90024
C.-S. Lee
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, CA 90024
C. N. J. Wagner
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, CA 90024
A. J. Ardell
Affiliation:
Department of Materials Science and Engineering, University of California, Los Angeles, CA 90024
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Abstract

Ordered Ni3Al containing 24 at.% Al was irradiated by 2 MeV protons at −45 °C to a fluence of 1.34 × 1016 H+/mm2. The induced microstructural changes were investigated by transmission electron microscopy, X-ray diffraction, scanning electron fractography and microhardness measurements. Proton irradiation produced a large volume fraction of small disordered zones residing in the ordered matrix. The morphology of the disordered zones bears some striking similarities to “tweed” microstructures. X-ray diffraction reveals distinct splitting of the higher order fundamental peaks toward low angles, and broadening of the displaced peaks, indicating that the zones observed are small clusters of tetragonally distorted disordered Ni3Al. The microhardness measurements suggest that the disordered zones strengthen the remaining ordered matrix considerably, most likely through a precipitation strengthening mechanism. The fractographic observations suggest that an increase in ductility accompanies disordering, as evidenced by the appearance of dimples, slip markings and river patterns on the fracture surface of the irradiated region of the sample.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 133: Symposium H – High-Temperature Ordered Intermetallic Alloys III , 1988 , 499
Copyright
Copyright © Materials Research Society 1989

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References

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