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| TEM OBSERVATION OF PHASE TRANSFORMATION IN 47121 β-Ti ALLOY |
| YU Xuejie (Shanghai Institute of Iron and Steel Research) |
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Cite this article:
YU Xuejie (Shanghai Institute of Iron and Steel Research). TEM OBSERVATION OF PHASE TRANSFORMATION IN 47121 β-Ti ALLOY. Acta Metall Sin, 1983, 19(5): 27-152.
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Abstract The phase transformation of Ti-4Al-7Mo-10V-2Fe-1Zr metastable β-Ti alloy has been studied by TEM. The results showed that the athermal ω-phase exists as quenched; the phase transformations undergo in aging at various temperatures as: below 500℃, β→β+ω (isothermal)→β+α; below 400℃, α-phase growing uniformly; between 400-500℃, no more α-phase altered from isothermal ω-phase first uniformly growing, yet selectively growing along the prior β-phase boundaries and at the local crystal defect sites;and beyond 550℃, direct reaction β→β+α and inner twinns forming in the most α plates which decrease in amount with the prolonged aging, then vanish finally. The ledges and displacement at the edge of the α plates were found to follow the above-mentioned process. It was indicated that the orientation relationship between β and α seems to obeythe Burgers' relationship no matter how the aging condition. Only one specimen was revealed the arced spots in the selected area electron diffraction pattern which may be caused by the precipitation of TiH_2.
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Received: 18 May 1983
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