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    11.
    发明专利
    未知

    公开(公告)号：FR2462484A1

    公开(公告)日：1981-02-13

    申请号：FR8013485

    申请日：1980-06-18

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： BLACKBURN MARTIN JOHN ,  SMITH MICHAEL PRICE

    IPC: C22C14/00 ,  C22F1/18

    Abstract: Titanium-aluminum-niobium alloys having narrow and critical composition ranges are disclosed. The alloys have room temperature tensile elongations of 1.5% or greater and creep strength to density ratios better than certain nickel superalloys. Thus, they may replace other heavier base alloys in many applications up to 750 DEG C. Aluminum content must be closely controlled as excess amount decreases ductility while insufficient amount decreases creep strength. Niobium content is also critical as excess amount adversely affects creep strength-to-density ratio while insufficient amount decreases ductility. And there is an important interrelationship between niobium and aluminum. Disclosed are alloys having atomic percent compositions of 24-27 Al, 11-16 Nb, balance Ti; more preferred are alloys of 24.5-26 Al, 12-15 Nb, balance Ti. (Nominally, these alloys in weight percent are Ti-13/15Al-19.5/30Nb and Ti-13.5/15Al-25/28Nb.) Vanadium is uniquely found to be substitutional for niobium in the foregoing alloys in amounts up to 4 atomic percent, thereby reducing density and increasing strength-to-density ratio while maintaining properties. Mechanical properties are dependent on heat treatment. For the best combination of strength and ductility, the alloys are heated or forged above the beta transus and controllably cooled to produce a fine Widmanstatten microstructure.

    12.
    发明专利
    未知

    公开(公告)号：FR2462483A1

    公开(公告)日：1981-02-13

    申请号：FR8012885

    申请日：1980-06-10

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： BLACKBURN MARTIN JOHN ,  SMITH MICHAEL PRICE

    IPC: C22C14/00 ,  C22F1/16

    Abstract: Cast and forged titanium alloys suited for use at temperatures over 600 DEG C. are based on TiAl gamma phase structure. Useful alloys have about 1.5% or greater tensile ductility at temperatures of 260 DEG C. and below, thereby making them fabricable and suited for engineering applications. Disclosed are alloys having weight percent compositions of 31-36 aluminum, 0-4 vanadium, balance titanium (in atomic percent, about: 45-50Al, 0-3V, bal Ti). The inclusion of about 0.1 weight percent carbon improves creep rupture strength. To obtain high tensile strength, the alloys are forged at about 1025 DEG C. and aged at about 900 DEG C.; to obtain higher creep rupture strength and tensile ductility, a solution anneal at about 1150 DEG C. is interposed before aging.

    19.
    发明专利
    未知

    公开(公告)号：FR2455010A1

    公开(公告)日：1980-11-21

    申请号：FR8008261

    申请日：1980-04-14

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： BLACKBURN MARTIN JOHN ,  SMITH MICHAEL PRICE ,  HAYDEN STEVEN Z

    IPC: B22D41/02 ,  B22C1/00 ,  B22C7/00 ,  B22C9/00 ,  C04B35/00 ,  C04B35/447 ,  C04B35/50 ,  C04B35/505 ,  C04B35/51 ,  C04B35/547 ,  F27B14/10 ,  F27D1/00

    Abstract: Improved refractories for resisting attack of molten titanium aluminum and similar metals are provided by the inclusion of sulfur. Metal, oxygen, and sulfur combinations, wherein sulfur is present at from 10 to 60 atomic percent, are particularly useful. Disclosed is a material having the atomic formula MaSbOc where O is oxygen, S is sulfur, and M is at least one metal selected from the scandium subgroup of the periodic table transition metals (scandium, yttrium and the rare earths) and aluminum. In an alternate material, M is comprised of at least two elements, the first selected as above and the second selected from the alkaline earth metal group. A preferred material is formed by mixing and firing CaS and Y2O3 in proportions which results in (Ca+Y)0.43S0.14O0.43.

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