Superplastic deformation characteristics of two microduplex titanium alloys |
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Authors: | M T Cope D R Evetts N Ridley |
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Affiliation: | (1) Department of Metallurgy and Materials Science, University of Manchester/UMIST, Grosvenor Street, M1 7HS Manchester, UK;(2) Metallurgical Research Laboratories, Rolls Royce, Elton Road, Derby, UK |
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Abstract: | A comparison of the superplastic deformation behaviour of Ti-6Al-4V (wt%) between 760 and 940‡ C and Ti-6Al-2Sn-4Zr-2Mo between
820 and 970‡ C has been carried out on sheet materials possessing similar as-received microstructures. High tensile elongations
were obtained with maximum values being recorded at 880‡ C for Ti-6Al-4V (Ti-6/4) and at 940‡ C for Ti-6Al-2Sn-4Zr-2Mo (Ti-6/2/4/2),
under which conditions both alloys possessed aΒ phase proportion of approximately 0.40. For a given deformation temperature the Ti-6/4 alloy had a slightly lower flow stress
than the Ti-6/2/4/2, and this was attributed to the lowerΒ phase proportion in the latter alloy. However, at the respective optimum deformation temperatures the Ti-6/2/4/2 alloy had
the lower flow stress. The results show that suitably processed Ti-6/2/4/2 alloy is capable of withstanding substantial superplastic
strains at relatively low flow stresses, although the optimum deformation temperature is higher for this alloy than for Ti-6/4
material possessing a similar microstructure. |
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