Abstract
A study was made of the temperature dependences of the flow stress σ0.1 (T) and of the critical shear stress τcr(T) of Cu-15% A1-(1–2)% Co, Cu-8% A1-(2–2.8)% Co, and Cu-4% A1–2% Co alloys containing noncoherent intermetallic particles. In the case of single crystals at temperatures 77–673° K there was a good agreement between the theoretically calculated values of the Orowan hardening and those found experimentally, so that the dependence τcr(T) was governed by the temperature dependence of the shear modulus G(T). For polycrystalline samples the usual dependence of the mechanical propertiesties on the grain size was not observed. At temperatures from 77 to 473–573°K the dependence σ0.1 (T) was similar to the dependence G(T) and a good agreement was observed between the theoretically calculated dispersion hardening effects with those found experimentally. At temperatures T > 473–573°K the deformation was influenced greatly by grain-boundary glide, which enhanced the dependence σ0.1 (T) compared with that expected theoretically.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 85–91, June, 1980.
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Chumlyakov, Y.I., Korotaev, A.D., Bushnev, L.S. et al. Temperature dependences of the flow and critical shear stresses of dispersion-hardening alloys. Soviet Physics Journal 23, 537–543 (1980). https://doi.org/10.1007/BF00892325
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DOI: https://doi.org/10.1007/BF00892325