Abstract: A modified alloy powder includes a powdered alloy; and a carbide powder, mixed in the powdered alloy; wherein the carbide powder has a particle size smaller than that of the powdered alloy, and the carbide powder is dedicated to powder bed selective laser melting and laser metal deposition technology. Being used as a grain refiner and a grain growth inhibitor, the effect of refinement in the grain size of final products and improvement of the workpiece strength can be achieved.

Abstract: Differing from traditional alloys often containing one primary elemental composition, the present invention reforms a conventional superalloy to a high-entropy superalloy by redesigning the elemental compositions of the conventional superalloy based on a mixing entropy formula. Particularly, this high-entropy superalloy shows advantages of light weight and low cost under the premise of containing a low amount of expensive metal composition. The proposed high-entropy superalloy of the present invention comprises a primary elemental composition and at least one principal strengthening elemental composition, wherein the primary elemental composition has a first element content of at least 35 at % and each of the principal strengthening elemental compositions have a second element content of over 5 at %.

Abstract: The present invention discloses a new alloy design of precipitation strengthened high entropy superalloy (HESA), which is composed of at least one principal element, a plurality of base element, and at least one precipitation strengthening element for controlling the elemental segregation between the high-entropy matrix and ordered precipitate. Through the addition of the precipitation strengthening element, while substituting the same amount of the principle element, not only the ordering energy and the volume fraction of strengthening precipitates, but also the mechanical strength of the alloy can be apparently elevated. Therefore, this newly-developed precipitation strengthened HESA can further improve the thermal capability and mechanical properties from the previously proposed high-entropy alloys.

Abstract: Differing from traditional alloys often containing one primary elemental composition, the present invention reforms a conventional superalloy to a high-entropy superalloy by redesigning the elemental compositions of the conventional superalloy based on a mixing entropy formula. Particularly, this high-entropy superalloy shows advantages of light weight and low cost under the premise of containing a low amount of expensive metal composition. The proposed high-entropy superalloy of the present invention comprises a primary elemental composition and at least one principal strengthening elemental composition, wherein the primary elemental composition has a first element content of at least 35 at % and each of the principal strengthening elemental compositions have a second element content of over 5 at %.

Abstract: Provided is an Ni-based single crystal superalloy wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to 2.0% by mass of Mo, from 3.0% by mass to 8.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 6.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co, from 1.0% by mass to 14.0% by mass of Ru, and from 0.1% by mass to 4.0% by mass of Nb, with the balance of Ni and inevitable impurities. The alloy prevents TCP phase precipitation at high temperatures, therefore having improved strength at high temperatures and having oxidation resistance at high temperatures. Specifically, the invention is to provide a high-performance Ni-based single crystal superalloy having well balanced high-temperature strength and high-temperature oxidation resistance in practical use.

Abstract: Provided is an Ni-based single crystal superalloy wherein the ingredients have a composition containing, as ratio by mass, from 5.0% by mass to 7.0% by mass of Al, from 4.0% by mass to 8.0% by mass of Ta, from 0% by mass to 2.0% by mass of Mo, from 3.0% by mass to 8.0% by mass of W, from 3.0% by mass to 8.0% by mass of Re, from 0% by mass to 0.50% by mass of Hf, from 3.0% by mass to 7.0% by mass of Cr, from 0% by mass to 9.9% by mass of Co and from 1.0% by mass to 10.0% by mass of Ru, with the balance of Ni and inevitable impurities. The alloy prevents TCP phase precipitation at high temperatures, therefore having improved strength at high temperatures and having oxidation resistance at high temperatures.