410 Final copy - MS&E 410/610 Final, 19 May, 2006...

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NAME:______________________ Except where noted, please do your work in the accompanying test booklet. 1) [30 pts] This is a question in several parts about Ti and Ti alloys a) Pure Ti undergoes a phase transformation from the hcp α phase to the bcc β phase when the temperature is raised past 882˚C. Why does this phase transformation occur? (Hint, Ti is like most of its transition metal neighbors in this respect). b) Describe two ways you could check to see if this phase transformation is martensitic. c) Other metallic elements are often added to stabilize either the phase (raise the transformation temperature) or the phase (lower the transformation temperature). The common alloying elements fall into two groups, the simple metals Al and Sn, and the transition metals V, Mo, Cr, and Cu. Which group stabilizes and which stabilizes ? Hint: You can answer this question simply by completing the following quote from a classic physical metallurgy text, which says “When simple metals, such as
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410 Final copy - MS&E 410/610 Final, 19 May, 2006...

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