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.

• Periodical: Materials Science Forum (Volumes 638-642)
• Pages: 2064-2067
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.638-642.2064
• Online since: January 2010
• Authors: Tomonari Inamura, Y. Yamamoto, Hee Young Kim, Kenji Wakashima, Shuichi Miyazaki, Hideki Hosoda
• Keywords: Damping, DMA, Internal Friction, Martensitic Transformation (MT), Titanium Alloy

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