Stress Amplitude Dependence of Internal Friction in TiNbAl Shape Memory Alloy

被引：0
作者：
Inamura, T. [1 ]
Yamamoto, Y. [1 ,3 ]
Kim, H. Y. [2 ]
Wakashima, K. [1 ]
Miyazaki, S. [2 ]
Hosoda, H. [1 ]
机构：
[1] Tokyo Inst Technol, Precis & Intelligence Lab, Tokyo, Japan
[2] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki, Japan
[3] Tokyo Inst Technol, Tokyo, Japan
来源：
THERMEC 2009, PTS 1-4 | 2010年 / 638-642卷
关键词：
DMA; damping; internal friction; martensitic transformation; titanium alloy; BETA-TITANIUM ALLOY; INDUCED MARTENSITE; DAMPING CAPACITY; SUPERELASTICITY; FREQUENCY; TEXTURE;
D O I：
10.4028/www.scientific.net/MSF638-642.2064
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Stress amplitude dependence of internal friction (tan delta) 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 delta 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, tan delta-peak appeared at around 153K. The tan delta-peak height clearly depended also on the stress amplitude (10 similar to 50MPa). In addition, a threshold stress for the appearance of the tan delta-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 tan delta-peak
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页码：2064 / +
页数：2
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