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- W2008060488 abstract "Creep characteristics of Ti-50 mol%Al single phase polycrystalline intermetallics are investigated in constant stress compressive creep tests. The material consists of equiaxed grains whose average diameter is 32 μm. The compressive stress and the temperature range from 100 MPa to 398 MPa, and from 1000 K to 1200 K, respectively. Most creep tests are continued up to a true strain of 0.7. Creep curves are composed of four portions appearing in succession; an instantaneous plastic strain, a primary transient of the normal type, a region representing the minimum creep rate, and a gradually accelerating creep. General feature of the creep curve is maintained in all the creep test, but, the instantaneous plastic strain and the strain at which the minimum creep rate is attained vary with temperature and stress. The minimum creep rate observed in the present study ranges from 10−7 s−1 to 10−3 s−1. The stress dependence of the minimum creep rates is described by a power law, dotεm∝σnm. The stress exponent, nm, decreases with rising temperature; nm is about 7 at 1000 K, and about 4.5 at 1200 K. The temperature dependence of the minimum creep rate becomes smaller with increasing stress; the apparent activation energy, Qm, is about 450 kJ/mol under 158 MPa, and about 350 kJ/mol under 398 MPa. Owing to such a functional form of nm(T) and Qm(σ), it is difficult to describe the minimum creep rates with a simple Dorn-type equation." @default.
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- W2008060488 date "1989-01-01" @default.
- W2008060488 modified "2023-09-27" @default.
- W2008060488 title "Creep Characteristics in Ti-50 mol%Al Single Phase Polycrystals" @default.
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- W2008060488 doi "https://doi.org/10.2320/matertrans1989.30.1044" @default.
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