SELF-DIFFUSION OF NIOBIUM IN SOME OF ITS ALLOYS WITH MOLYBDENUM,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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Self diffusion coefficients D were obtained for niobium alloyed with 5, 10, 20, 30 and 45 Mo. The values of D were determined from radioactive tracer measurements Of Nb95 in the form of Nb2O3. Lattice parameters were determined by the powder method and both hardnesses and microhardnesses were obtained by standard methods. The self diffusion coefficient of Nb is given as a function of Mo content for temperatures ranging from 1600 to 2100C while both the activation energy E and the diffusion parameter 1n D sub O are given as functions of Mo content. The relation between 1n D sub O and E is given. A list of all the diffusion parameters, hardnesses, microhardnesses and lattice parameters is presented for various temperatures and Mo content. Comparisons of E and 1n D sub O are made for the Mo-Zr system which also had a linear dependence of 1n D sub O as a function of E.
- Properties of Metals and Alloys