Abstract: A TiAl alloy is provided with 47 at % or more and 50 at % or less of Al, 1 at % or more and 2 at % or less of Nb, 2 at % or more and 5 at % or less of Zr, 0.05 at % or more and 0.3 at % or less of B, and the balance being Ti and inevitable impurities.

Abstract: A TiAl alloy member for hot forging includes a substrate made of TiAl alloy, and an Al layer formed on a surface of the substrate, the Al layer containing Al as a main constituent and containing Ti.

Abstract: A method of manufacturing a TiAl alloy includes a casting step of melting and casting a TiAl alloy raw material which contains 42 at % or more and 45 at % or less of Al, 3 at % or more and 6 at % or less of Nb, 3 at % or more and 6 at % or less of V, 0.1 at % or more and 0.3 at % or less of B, and the balance being Ti and inevitable impurities, a hot forging step of hot forging the cast TiAl alloy by heating the cast TiAl alloy to a temperature range between 1200° C. or higher and 1350° C. or lower, and a thermal treatment step of holding the hot-forged TiAl alloy at a temperature range between 1220° C. or higher and 1300° C. or lower for a hour range between 1 hour or longer and 5 hours or shorter, applying a first thermal treatment to the hot-forged TiAl alloy, cooling the TiAl alloy subjected to the first thermal treatment to a temperature range between 1000° C. or higher and 1100° C. or lower at a cooling rate of 400° C.

Abstract: A TiAl alloy material for hot forging includes a TiAl alloy substrate formed of a TiAl alloy which contains 42 at % or more and 45 at % or less of Al, 3 at % or more and 6 at % or less of Nb, 3 at % or more and 6 at % or less of V, 0.1 at % or more and 0.3 at % or less of B, and the balance being Ti and inevitable impurities, an intermediate layer formed on a surface of the TiAl alloy substrate, and a titanium layer formed on a surface of the intermediate layer, wherein the intermediate layer is formed of a first layer which is formed on a side of the TiAl alloy substrate and is formed of the TiAl alloy which becomes ?-TiAl at a hot forging temperature range between 1200° C. or higher and 1350° C. or lower and a second layer that is formed on a side of the titanium layer and is formed of a ?-Ti material.

Abstract: A TiAl alloy contains 48 at % or more and 50 at % or less of Al, 1 at % or more and 3 at % or less of Nb, 0.3 at % or more and 1 at % or less of Zr, 0.05 at % or more and 0.3 at % or less of B, and the balance being Ti and inevitable impurities.

Abstract: A TiAl alloy contains 48 at % or more and 50 at % or less of Al, 3 at % or more and 5 at % or less of Nb, 0.1 at % or more and 0.3 at % or less of B, and the balance being Ti and inevitable impurities.

Abstract: A titanium aluminide alloy material for hot forging has a chemical composition including, by atom, aluminum of 38.0% or greater and 39.9% or less, niobium of 3.0% or greater and 5.0% or less, vanadium of 3.0% or greater and 4.0% or less, carbon of 0.05% or greater and 0.15% or less, and titanium and an inevitable impurity as a residue.

Abstract: A titanium aluminide alloy material for hot forging has a chemical composition including, by atom, aluminum of 43.0% or greater and 45.0% or less, niobium of 4.0% or greater and 6.0% or less, chromium of 1.5% or greater and 3.5% or less, and titanium and an inevitable impurity as a residue.

Abstract: A TiAl alloy for forging, contains 41 at % or more and 44 at % or less of Al, 4 at % or more and 6 at % or less of Nb, 4 at % or more and 6 at % or less of V, 0.1 at % or more and 1 at % or less of B, and the balance being Ti and inevitable impurities.

Abstract: A method of bonding metal members includes a stacked body forming step of forming a stacked body by putting an insert material between a first metal member and a second metal member formed of carbide-containing Ni alloys or carbide-containing Fe alloys, and a solid phase diffusion bonding step of forming a metal member joint body by heating and pressurizing the stacked body to perform solid phase diffusion bonding, wherein the insert material contains Ni having a content higher than an Ni content of the first metal member and the second metal member when the first metal member and the second metal member are formed of the carbide-containing Ni alloys, and contains Fe or Ni having a content higher than an Fe content of the first metal member and the second metal member when the first metal member and the second metal member are formed of the carbide-containing Fe alloys.

Abstract: A TiAl alloy member for hot forging includes a substrate made of TiAl alloy, and an Al layer formed on a surface of the substrate, the Al layer containing Al as a main constituent and containing Ti.

Abstract: A TiAl alloy for forging, contains 41 at % or more and 44 at % or less of Al, 4 at % or more and 6 at % or less of Nb, 4 at % or more and 6 at % or less of V, 0.1 at % or more and 1 at % or less of B, and the balance being Ti and inevitable impurities.

Abstract: An electrode applicable to discharge surface treatment is produced. This method is comprised of: kneading a composition including an electrically conductive mixed matter including a first powder obtained by at least any process selected from the group consisting of an atomizing method, a reduction method, and a carbonyl method and a second powder obtained by a crushing method, and a binder, the electrically conductive mixed matter including the second powder at a ratio of 10-65 weight %; injecting the kneaded composition into a mold to produce a green body; heating the green body so as to remove the binder from the green body; and sintering the green body excepting the binder.

Abstract: An electrode used in combination with an electric spark machine for surface treatment, is comprised of a mixed powder including a powder of aluminum at a ratio of 5-18 weight % to the total of the mixed powder or a powder of any metal selected from the group consisting of nickel, cobalt, and iron at a ratio of 5-40 weight % to the total of the mixed powder and a powder of titanium hydride, wherein the mixed powder is formed by molding and sintering into a structure so dimensioned as to be incorporated in the electric spark machine as an electrode therefor.