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The Evolution of Prior-BCC Grain Boundary Cracking During In-situ Creep Deformation of a Ti-15Al-33Nb(at%) Alloy

Published online by Cambridge University Press:  26 February 2011

Christopher J. Cowen  and
Carl J. Boehlert
Christopher J. Cowen
Affiliation:
[email protected], Michigan State University, Chemical Engineering and Materials Science, 2527 Engineering Building, East Lansing, MI, 48824-1226, United States
Carl J. Boehlert
Affiliation:
[email protected], Michigan State University, Chemical Engineering and Materials Science, 2527 Engineering Building, East Lansing, MI, 48824-1226, United States
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Abstract

In-situ tensile-creep experiments were performed on a Ti-15Al-33Nb(at%) alloy using a specialized tensile stage placed within the vacuum chamber of a Camscan 44 FE scanning electron microscope (SEM). The creep damage evolution on the sample surface was chronicled through backscattered electron (BSE) imaging as a function of stress, time, and creep displacement at 650°C. The experiments revealed that the prior-BCC grain boundaries were the locus of damage accumulation during creep and significant grain boundary cracking was observed. The grain boundary cracking was verified to occur within the bulk of the material through post-mortem analysis.

Keywords

Tigrain boundariesscanning electron microscopy (SEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II05-05
Copyright
Copyright © Materials Research Society 2007

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References

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