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The variation of beta phase morphology after creep and negative creep for duplex titanium alloys |
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| Authors: | Shing-Hoa Wang Hao-Hsun Lee Chih-Yuan Chen Jer-Ren Yang Chin-Hai Kao |
| Affiliation: | (1) Department of Mechanical Engineering, National Taiwan Ocean University, 20224 Keelung, Taiwan;(2) Institute of Materials Science and Engineering, National Taiwan University, 10617 Taipei, Taiwan;(3) S-Tech Corporation, Sinying 730, Tainan, Taiwan |
| Abstract: | The creep resistance of SP700 (Ti–4.5Al–3V–2Mo–2Fe) is superior to Ti–6–4 (Ti–6Al–4V) at 500 °C under a constant load corresponding to an initial stress of 100 MPa. The β phase grains in the SP700 alloy prefer to orient along the loading axis in contrast to the Ti–6–4 alloy. The grain growth occurs during the stress drop incubation period. The observation of different amounts of negative creep/anelasticity upon loading is closely associated with the difference in the amount of grain/subgrain coarsening. |
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