Effect of purity on dislocation-induced relaxations in molybdenum single crystals

Shigeru Suzuki, Alfred Seeger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Dislocation-induced relaxations in different molybdenum single crystals were investigated by means of low-frequency internal friction measurements in the temperature range of 20-600 K. The results indicated that the appearance of the dislocation-induced relaxations strongly depends on the purity of the molybdenum, although the intrinsic dislocation relaxations appeared at about 100 K and 450 K in the high-purity molybdenum. The molybdenum containing a small amount of carbon did not exhibit the intrinsic dislocation relaxations but rather revealed a modulus increase due to the dislocation pinning caused by the dissolved carbon. When the molybdenum containing a small amount of carbon was annealed up to 700 K, a new relaxation peak appeared at about 450 K. The activation process for this relaxation indicated that it could be attributed to the relaxation due to a carbon-dislocation interaction. In addition, it was shown that the dislocation-induced relaxations in medium-purity molybdenum were small, which was attributed to the residual substitutional impurities in the molybdenum.

Original languageEnglish
Title of host publicationDiffusion in Materials
EditorsS.V. Divinski, N.A. Stolwijk, H. Bracht
PublisherTrans Tech Publications Ltd
Pages106-111
Number of pages6
Volume363
ISBN (Print)9783038354277
DOIs
Publication statusPublished - 2015
EventInternational Conference on Diffusion in Materials, DIMAT 2014 - Munster, Germany
Duration: 2014 Aug 172014 Aug 22

Other

OtherInternational Conference on Diffusion in Materials, DIMAT 2014
CountryGermany
CityMunster
Period14/8/1714/8/22

Keywords

  • Dislocation
  • Internal friction
  • Molybdenum
  • Purity
  • Relaxation

ASJC Scopus subject areas

  • Radiation
  • Materials Science(all)
  • Condensed Matter Physics

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