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| EFFECT OF α-PHASE MORPHOLOGY ON STRENGTHENING AND FRACTURE BEHAVIOUR OF 47121 β-Ti ALLOY |
| YU Xuejie; WANG Jianlin (Shanghai Iron and Steel Research Institute)(Manuscript received 4 October; 1983; revised manuscript 11 January; 1984) |
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Cite this article:
YU Xuejie; WANG Jianlin (Shanghai Iron and Steel Research Institute)(Manuscript received 4 October; 1983; revised manuscript 11 January; 1984). EFFECT OF α-PHASE MORPHOLOGY ON STRENGTHENING AND FRACTURE BEHAVIOUR OF 47121 β-Ti ALLOY. Acta Metall Sin, 1984, 20(5): 333-454.
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Abstract An investigation was conducted to examine the tensile property of 47121 β-Ti alloy in relation to the morphology of α-phase and to the fracture behaviour by means of TEM, SEM and X-ray diffraction as well as tension test. The results showed that with the increasing of volume fraction of the dispersive α-phase particles, transformed from ω-phase in situ during its aging at low temperature, the coherent stress field between particles overlapped each other and the stronger internal stress field formed in the specimen. Under the action of loading the macroscopic brittle fracture followed but on the microscopic fracture mechanism it fractured really into dimples. Therefore, the local internal stress peaks may be considered as the nuclei to form the fine dimples. The α-phase of Widmans(?)tt structure has much effect on the work-hardening. Cutting through the α-phase particles by dislocation seems to be the main strengthening mechanism in this condition, but the particles of deformation-twinned α-phase obstruct the cutting by dislocation. The non-precipitated zone formed nearby the both sides of grain boundaries together with the colony of further grown feather-like α-phase might weaken the grain boundary zone and lead it to form an alike intergranular fracture on the broken specimen.
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Received: 18 May 1984
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