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- W318645861 abstract "The gamma phase of the Ti--Al binary system is of interest because it exists as a single phase up to its melting temperature (1460 deg C) and has been shown by the Armour Research Foundation to have good strength to very high temperatures. However, the brittleness of the gamma phase, which is believed to be caused by its ordered face-centered tetragonal crystal structure, has discouraged its development as an elevated temperature material. It is believed that if the c/a ratio of the crystal structure could be lowered and the ordering destroyed, the brittleness would be reduced. Previous investigators have reported a lowering of the c/a ratio to 1.006 at 15% zirconium and predicted a c/ a ratio of unity at 20% zirconium in the gamma phase. This investigation was conducted to determine if the c/a ratio of unity could be obtained. Data obtained are compared with data from which the c/a ratio of unity was predicted. The conclusions that are drawn from this comparison are that the c/a ratio of unity can not be obtained as predicted, and that phases other than the gamma phase are present in alloys at which his prediction was made. Coincident with the lattice parametermore » determinations, a study was made of the presence of phases in the region of the Ti-Al- Zr ternary system between 45 and 55 atomic percent aluminum. Two, and possibly three, new phases are observed, but their identification was not undertaken. The results of the phase investigation are given. (auth)« less" @default.
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- W318645861 date "1961-08-01" @default.
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- W318645861 title "A PHASE STUDY OF A SELECTED PROTION OF THE Ti-Al-Zr TERNARY SYSTEM INCLUDING LATTICE PARAMETER DETERMINATIONS FOR THE Ti-Al $gamma$ PHASE (thesis)" @default.
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