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Annealing induced structural changes and microcracking in Mo-Mo3Si

Published online by Cambridge University Press:  11 February 2011

X.-L. Wang,
J. H. Schneibel,
Y. D. Wang and
J. W. Richardson
X.-L. Wang
Affiliation:
Spallation Neutron Source, 701 Scarboro Road, Oak Ridge National Laboratory Oak Ridge, TN 37831Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831- 6115
J. H. Schneibel
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831- 6115
Y. D. Wang
Affiliation:
Spallation Neutron Source, 701 Scarboro Road, Oak Ridge National Laboratory Oak Ridge, TN 37831
J. W. Richardson
Affiliation:
Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, IL 60439
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Abstract

Cast Mo-Mo3Si intermetallic composites develop microcracks after annealing at high temperature. Neutron diffraction, x-ray diffraction, composition analysis, and scanning electron microscopy have been used to characterize the structural changes induced by annealing of Mo-Mo3Si. It is shown that the observed cracking cannot be attributed to differential thermal stresses that developed on cooling from the annealing temperature. Instead, the experimental data suggest that the cracks were initiated at high temperature, possibly due to diffusion of Si atoms from supersaturated α-Mo to Mo3Si.

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References

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