THE EFFECT OF ALUMINUM ON THE STABILITY OF THE BETA PHASE IN Ti-Mo-Fe ALLOYS (in Russian)
Tl-- Mo-- Fe alloys containing 1, 2, and 3% Al by weight were prepared by pressing out a pellet of the mixed ingredients and then fusing in a vacuum arc furnace with a tungsten electrode in an atmosphere of argon or helium. The fusion was repeated 3 to 4 times. The samples were forged into bars at a temperature of 750 to 950 deg C, and annealied for two hours at 900 deg C. The annealied samples were quenched from temperatures of 700 to 1000 deg C. The alloys contained 6.7 to 13.5% Mo, 2.2 to 10% Fe, and 1, 2, or 3% Al with the remainder being Ti. All the alloys, with the exception of the 6.7% Mo--2.2% Fe alloy containing 1, 2, and 3% Al, showed the single-phase structure of a solid BETA solution on quenching from 700#DEC. The quenched alloys were aged at 200 to 800 deg C for 0.25 to 144 hours. On heating for 15 minutes at 200 deg C, the BETA -phase of Ti-8.7% Mo-2.2% Fe alloy (formed by quenching from 900 to 1000 deg C) broke down into an omega -phase, as shown by an increase in hardness. The transition BETA + omega yields BETA + alpha took place at 400 deg C after 25 hours aging. The BETA -phase broke down directly to the alpha -phase with no intermediate formation of an omega -phase. The BETA -phase was stable at 300 deg C for 100 hours in all alloys. In Ti-12% Mo-10% Fe alloys containing 1, 2, and 3% Al, the BETA -phase was stable for 144 hours. In Ti-9% Mo --10% Fe alloys containing 1, 2, and 3% Al, the BETA -phase broke down in 121, 25, and 16 hours respectively at 400 deg C. The alloy broke down in 15 minutes at 500 deg C. The stability of the BETA phase decreased with increasing aluminum content. (TTT)
- Research Organization:
- Baikov Inst. of Metallurgy, Academy of Sciences, USSR
- NSA Number:
- NSA-17-001968
- OSTI ID:
- 4772581
- Journal Information:
- Doklady Akad. Nauk SSSR, Journal Name: Doklady Akad. Nauk SSSR Vol. Vol: 146
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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