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Assessing Failure Mechanisms During Transformation Superplasticity of Ti-6Al-4V

Published online by Cambridge University Press:  10 February 2011

C. Schuh  and
D. C. Dunand
C. Schuh
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA
D. C. Dunand
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA
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Abstract

During thermal cycling through the α/β phase transformation under the action of a small external biasing stress, Ti alloys exhibit an average deformation stress exponent of unity and achieve superplastic strains. We report tensile experiments on Ti-6Al-4V with an applied stress of 4.5 MPa, aimed at understanding the failure processes during transformation superplasticity. The development of cavities is assessed as a function of superplastic elongation, and macroscopic neck formation is quantified at several levels of elongation by digital imaging techniques. The effects of thermal inhomogeneity on neck initiation and propagation are also elucidated experimentally.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 55
Copyright
Copyright © Materials Research Society 2000

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