DYNAMICS OF INTERFACIAL AREA CHANGE DURING MECHANICAL ALLOYING OF W WITH NI

Quantitative X-ray diffraction analysis was employed to study kinetics of the formation of the solid solution of W in Ni during mechanical p rocessing of a mixture of metal powders. The variation in the W conten t in the mixture, the lattice parameters of the solid solution of W in Ni, the dimensions of the regions of coherent scattering L-rcs, and t he root-mean-square microdistortions of crystal lattices for both comp onents were monitored. The kinetics was represented as the N(D) and L- rcs(D) dependences on dose D. It was established that the limiting sta ge of the formation of the solid solution is the penetration of W atom s through the component contact surface with the area S-c. The depende nce of the tungsten consumption N(D) in a mixture of the specified com position can be described by equation -dN/dD = G(0)S(c), where G(0) is the coefficient characterizing the interface permeability. The patter n of the L-rcs(D) dependence is determined by the character of the tun gsten particle size distribution. The value of G(0) is equal to 0.04 m ol g/MJ m(2).