By T. L. Trenogina, R. M. Lerinman (auth.), J. C. Williams, A. F. Belov (eds.)

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The structural stresses arise at the early stages of decomposition and cause embrittlement of the material. Apparently, additional conditions are needed for crack initiation and propagation. One of these conditions is the heterogeneity of the initial structure in terms of the presence of a-phase areas in the S-matrix. Significant in this respect is an experiment on the cracking of blanks of (a+S) high alloys containing various amounts of aluminum (0-6%) and, consequently, various amounts and qualities of the initial aphase.

Effect of oxygen and nitrogen contents and dry ice soaking on peaks P2 and P3 . 1668 S. MISHRA AND M. K. C8) measured internal friction during diffusionless phase transformations in Cu-Ni alloys. The relaxation peaks associated with this type of atom shuffle process are quite different than Peak P 1 in the sense that there is observed a ternperature lag in the peak temperatures while heating and cooling operations. 6. These peaks are due to interstitial-vacancy pair mechanism in the metastable B matrix.

The alloys are melted in an electron beam furnace in the form of 'fingers' which were subsequently cold rolled and drawn into lmm. dia. wires. Interstitial additions to the alloys are made by soaking the wires in the high temperature beta range for sufficient time to allow the diffusion of the interstitial elements. The sample length used is lSOmm. The creep effects in these samples have been ignored as they have been found to be negligible. RESULTS AND DISOJSSION In all, six peaks have been observed.

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