A theory of mechanical relaxation of substitutional-interstitial (tetrahedral) atom complexes in the b.c.c. lattice

Masahiro Koiwa The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai, Japan

Shunya Ishioka The Research Institute for Iron, Steel and Other Metals, Tohoku University, Sendai, Japan

G. Cannelli Consiglio Nazionale delle Ricerche, Istituto di Acustica ‘O.M. Corbino’, Via Cassia 1216, 00189, Rome, Italy

R. Cantelli Consiglio Nazionale delle Ricerche, Istituto di Acustica ‘O.M. Corbino’, Via Cassia 1216, 00189, Rome, Italy

Abstract

The relaxation of an atom pair consisting of a substitutional atom and a tetrahedral interstitial atom in the b.c.c. lattice is studied theoretically. The pair exhibits three relaxation modes: one T _2g and two E _g modes. The relative relaxation magnitude of the two E _g modes depends strongly on the anisotropy of the λ tensor. Experimental results of internal friction studies of Nb[sbnd]Ti[sbnd]H and V[sbnd]Ti[sbnd]H alloys are discussed in the light of the present analysis.

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A theory of mechanical relaxation of substitutional-interstitial (tetrahedral) atom complexes in the b.c.c. lattice

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A theory of mechanical relaxation of substitutional-interstitial (tetrahedral) atom complexes in the b.c.c. lattice

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