Microstructural development of a gas-atomized and hot-pressed super-{alpha}{sub 2} alloy
- Harbin Inst. of Tech. (China). Materials Science and Engineering School
- Academia Sinica, Shenyang (China). Inst. of Metal Research
A variety of heat treatments have been employed to explore the microstructure in Ti-25Al-10Nb-3V-1Mo alloy prepared by gas atomization and hot pressing. These treatments include quenching by oil cooling and water cooling and aging at temperatures between 530 C and 950 C. Quenching transformations from the {beta}-phase field include the formation of O phase in oil quenching and {beta} (disordered) + O phase in water quenching. The metastable {beta} phase decomposes into O + {omega}, O, or {alpha}{sub 2} + {beta}{sub 0}/B2 phase when the as-quenched alloy is aged at various temperatures. By comparing the selection area diffraction patterns, it has been found that the ordered {omega} phase in the alloy studied in this article is distinct in structure to the {omega} type (P3m1) and B8{sub 2} phase which are formed in the parent matrix of the ordered {beta}(B2,D0{sub 3}) phases. It has also been shown by X-ray diffraction (XRD) analyses that the lattice parameters of the as-aged O phase do not remain constant in the alloy at various temperatures.
- OSTI ID:
- 367288
- Journal Information:
- Metallurgical Transactions, A, Vol. 27, Issue 8; Other Information: PBD: Aug 1996
- Country of Publication:
- United States
- Language:
- English
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