Substitutional-interstitial interactions in niobium-titanium alloys: An internal friction study |
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Authors: | R Cantelli Z C Szkopiak |
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Institution: | (1) Department of Metallurgy and Materials Technology, University of Surrey, Guildford, Surrey, UK;(2) Present address: Istituto di Acustica “O. M. Corbino”, Consiglio Nazionale delle Ricerche, Via Cassia 1216, I-00189 Roma, Italia |
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Abstract: | The influence of additions of interstitial oxygen and nitrogen on the internal friction spetrum of the niobium-1 at-% titanium
alloy was studied. The nature of the various observed relaxation processes introduced by the presence of substitutional titanium
is discussed. A thermodynamic analysis was carried out for two pronounced interaction peaks attributed to the stress-induced
reorientation of single oxygen or nitrogen atoms around single titanium atoms and the respective binding energies were estimated.
It was also found that, over the range of oxygen concentration studied, interstitial oxygen is completely removed from random
migration by substitutional titanium atoms acting as trapping centres, whilst nitrogen population is always partitioned between
mobile and trapped atoms even at very low relative nitrogen concentrationsC
N/C
Ti. A possible reason for the different behavior of oxygen and nitrogen is suggested. |
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Keywords: | |
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