Softening of work-hardened Al-Si crystals and low-temperature creep

Abstract The softening on annealing after work hardening and the creep have been studied in a dispersion–strengthened Al–Si alloy. The softening rate is inversely proportional to the fourth power of the particle size. The stationary creep rate is found to depend linearly on applied stress and it also proportional to the inverse fourth power of the particle size. Those observations are in agreement with calculations based on an analysis of the Orowan loop climb process through dislocation pipe diffusion. The activation energy of the pipe diffusion is determined to be ∼ 0·54 eV.

[1]  T. Mura,et al.  The polynomial eigenstrain problem for an anisotropic ellipsoidal inclusion , 1978 .

[2]  T. Mura,et al.  Calculation of back stress decrease caused by climb of Orowan loops in a dispersion hardened alloy , 1978 .

[3]  T. Mori,et al.  Effect of particle size on low temperature softening of work hardened Cu-SiO2 crystals , 1977 .

[4]  H. Lilholt.  Hardening in two-phase materials. I. Strength contributions in fibre-reinforced copper--tungsten , 1977 .

[5]  F. J. Humphreys,et al.  Work-hardening and recovery of dispersion hardened alloys , 1976 .

[6]  L. M. Brown,et al.  The work-hardening of copper-silica v. equilibrium plastic relaxation by secondary dislocations , 1976 .

[7]  R. Asaro,et al.  The non-uniform transformation strain problem for an anisotropic ellipsoidal inclusion , 1975 .

[8]  Trevor A. Mori,et al.  Decrease of back stress and softening of work hardened copper-silica crystals by recovery , 1975 .

[9]  L. M. Brown,et al.  The work-hardening of copper-silica: IV. The Bauschinger effect and plastic relaxation , 1974 .

[10]  P. Hirsch,et al.  A coplanar Orowan loops model for dispersion hardening , 1974 .

[11]  F. J. Humphreys,et al.  The Bauschinger effect, work-hardening and recovery in dispersion-hardened copper crystals , 1974 .

[12]  L. Brown.  Back-stresses, image stresses, and work-hardening , 1973 .

[13]  K. Tanaka,et al.  Average stress in matrix and average elastic energy of materials with misfitting inclusions , 1973 .

[14]  L. M. Brown,et al.  The work-hardening of copper-silica: I. A model based on internal stresses, with no plastic relaxation , 1971 .

[15]  R. Jones,et al.  The tensile deformation of copper single crystals containing BeO particles , 1969 .

[16]  J. D. Eshelby,et al.  The elastic field outside an ellipsoidal inclusion , 1959, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[17]  J. D. Eshelby.  The determination of the elastic field of an ellipsoidal inclusion, and related problems , 1957, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.