Abstract: A vacuum smelting device with mold-temperature control design includes: a chamber body and a cabin door, wherein the chamber body and the cabin door form a vacuum closed space; a smelting crucible disposed in the vacuum closed space for smelting raw materials to a molten metal; a casting mold also disposed in the vacuum closed space for accommodating the molten metal poured from the smelting crucible, and solidifying the molten metal to an as-cast alloy; and a mold-temperature control module surrounding the casting mold for controlling the temperature of the casting mold.

Abstract: A heat treatment method for a titanium-aluminum (TiAl) intermetallic includes the following steps: providing a TiAl intermetallic casting material; performing a first-stage heat treatment on the TiAl intermetallic casting material, where the TiAl intermetallic casting material is heated until a metallographic structure thereof is transformed into the ?+? phase, and is then cooled to room temperature to form a transitional casting material; and performing a second-stage heat treatment on the transitional casting material, where the transitional casting material is heated until a metallographic structure thereof is transformed into the ? single phase, and is then cooled to room temperature to form a TiAl intermetallic.

Abstract: A titanium-aluminum intermetallic for improving casting fluidity includes the following elements in atomic percentage: Al: 40 at % to 50 at %, Cr: 1 at % to 8 at %, Nb: 1 at % to 8 at %, Mo: 1 at % to 5 at %, Mn: 1 at % to 6 at %, Ni+Si+Fe: 1 at % to 15 at %, B: 0.05 at % to 0.8 at %, and the balance of Ti and inevitable impurities. The titanium-aluminum intermetallic in the present disclosure has more adequate casting fluidity, that is, has better castability.

Abstract: A heat treatment method for a titanium-aluminum (TiAl) intermetallic includes the following steps: providing a TiAl intermetallic casting material; performing a first-stage heat treatment on the TiAl intermetallic casting material, where the TiAl intermetallic casting material is heated until a metallographic structure thereof is transformed into the a+? phase, and is then cooled to room temperature to form a transitional casting material; and performing a second-stage heat treatment on the transitional casting material, where the transitional casting material is heated until a metallographic structure thereof is transformed into the ? single phase, and is then cooled to room temperature to form a TiAl intermetallic.

Abstract: A titanium-aluminum intermetallic for improving casting fluidity includes the following elements in atomic percentage: Al: 40 at % to 50 at %, Cr: 1 at % to 8 at %, Nb: 1 at % to 8 at %, Mo: 1 at % to 5 at %, Mn: 1 at % to 6 at %, Ni+Si+Fe: 1 at % to 15 at %, B: 0.05 at % to 0.8 at %, and the balance of Ti and inevitable impurities. The titanium-aluminum intermetallic in the present disclosure has more adequate casting fluidity, that is, has better castability.