n358821SE Academic Article uri icon

abstract

  • The stress dependence of the subgrain size is often found to vary according to the relation where ds is the subgrain diameter, b is the Burgers vector, σ is the applied stress, G is the shear modulus, and K and m are constants. In this paper the values of the constants K and m are considered. Data from a large number of experimental investigations are compiled, and it is found that there are large variations in the observed values of m and K. The mean value of m is 0.84, and K is found to be dependent on m through the relation log K = -3.0m + 4.37 It is shown that these observations can largely be explained in terms of random error in the experimental determination of subgrain size. As a consequence, a single set of constants can be used to describe the stress dependence of the subgrain size for many but not all materials. The values m = 1 and K = 23 appear to work as well as any. A number of models proposed to explain the above relation are evaluated and compared with the present results. © 1986.

author list (cited authors)

  • Raj, S. V., & Pharr, G. M.

publication date

  • January 1, 1986 11:11 AM