Sintered compacts, magnetostrictive materials, and method for manufacturing sintered compacts

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A method for manufacturing a sintered compact includes the steps of preparing an alloy powder having a composition represented by Expression 1 : RT w (where, R is at least one kind of rare earth metal, T is at least one kind of transition metal, and w defines a relation of 1 < w < 4), sintering the alloy powder in a vacuum atmosphere or an atmosphere containing gas with a molecular weight of 30 or less, and processing the alloy powder by a hot isostatic pressing. The sintered compact has a high density, and reduces deteriorations in its sintered compact properties such as magnetostrictive properties in an air atmosphere at high-temperatures.