Effect of Purity on Dislocation-Induced Relaxations in Molybdenum Single Crystals

Shigeru Suzuki; Alfred Seeger

doi:10.4028/www.scientific.net/DDF.363.106

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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 363Effect of Purity on Dislocation-Induced...

Effect of Purity on Dislocation-Induced Relaxations in Molybdenum Single Crystals

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.

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Periodical:

Defect and Diffusion Forum (Volume 363)

Pages:

106-111

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.363.106

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Online since:

May 2015

Authors:

Shigeru Suzuki*, Alfred Seeger

Keywords:

Dislocation, Internal Friction, Molybdenum, Purity, Relaxation

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DOI: 10.1007/978-3-642-56255-6_11

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