Paper Title:
Stress Amplitude Dependence of Internal Friction in TiNbAl Shape Memory Alloy
  Abstract

Stress amplitude dependence of internal friction (tanδ) of a Ti-base shape memory alloy, Ti-24mol%Nb-3mol%Al, with a well developed texture is investigated by a dynamic mechanical analyzer (DMA) in a tensile mode. In the martensite (C-orthorhombic) phase, tan was 0.01~0.05 and was much higher than that of the parent phase in all the test conditions. This means that the martensite/martensite interfaces move under the external sinusoidal stress. In addition to this high background, tanδ-peak appeared at around 153K. The tanδ-peak height clearly depended also on the stress amplitude (10~50MPa). In addition, a threshold stress for the appearance of the tanδ-peak existed in the DMA test and it was in good agreement with the yield stress (0.2% proof stress) in a tensile test at 153K. These results mean that a long-range motion of twin-boundaries is necessary for the appearance of the tanδ-peak.

  Info
Periodical
Materials Science Forum (Volumes 638-642)
Main Theme
Edited by
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
Pages
2064-2067
DOI
10.4028/www.scientific.net/MSF.638-642.2064
Citation
T. Inamura, Y. Yamamoto, H. Y. Kim, K. Wakashima, S. Miyazaki, H. Hosoda, "Stress Amplitude Dependence of Internal Friction in TiNbAl Shape Memory Alloy ", Materials Science Forum, Vols. 638-642, pp. 2064-2067, 2010
Online since
January 2010
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$32.00
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