Effect of Hydrogen on the Elastic and Anelastic Properties of the R Phase in Ti50Ni46.1Fe3.9 Alloy

被引:2
作者
Sapozhnikov, Konstantin [1 ,2 ]
Torrens-Serra, Joan [3 ]
Cesari, Eduard [3 ]
Van Humbeeck, Jan [4 ]
Kustov, Sergey [2 ,3 ]
机构
[1] Ioffe Inst, Div Solid State Phys, Politekhnicheskaya 26, St Petersburg 194021, Russia
[2] ITMO Univ, Dept Modern Funct Mat, Kronverkskiy 49, St Petersburg 197101, Russia
[3] Univ Illes Balears, Dept Fis, Cra Valldemossa Km 7-5, E-07122 Palma De Mallorca, Spain
[4] Katholieke Univ Leuven, Dept Mat Kunde MTM, Kasteelpk Arenberg 44, B-3001 Leuven, Belgium
来源
METALS | 2017年 / 7卷 / 11期
关键词
shape memory alloy; acoustic properties; internal friction; lattice defects; hydrogen; SHAPE-MEMORY ALLOYS; NI-FE ALLOY; DOPED TI-NI; INTERNAL-FRICTION; DAMPING CHARACTERISTICS; STRAIN GLASS; BEHAVIOR; TRANSFORMATION; DISLOCATIONS; MARTENSITE;
D O I
10.3390/met7110493
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The linear and non-linear internal friction, effective Young's modulus, and amplitude-dependent modulus defect of a Ti50Ni46.1Fe3.9 alloy have been studied after different heat treatments, affecting hydrogen content, at temperatures of 13-300 K, and frequencies near 90 kHz. It has been shown that the contamination of the alloy by hydrogen gives rise to an internal friction maximum in the R martensitic phase and a complicated pinning stage in the temperature dependence of the effective Young's modulus at temperatures corresponding to the high-temperature side of the maximum. Dehydrogenation of the H-contaminated alloy transforms the internal friction maximum into a plateau and minimizes the pinning stage. The internal friction maximum is associated with a competition of two different temperature-dependent processes affecting the hydrogen concentration in the core regions of twin boundaries. The amplitude-dependent anelasticity of the R phase is also very sensitive to hydrogen content, its temperature dependence reflects the evolution of extended hydrogen atmospheres near twin boundaries.
引用
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页数:8
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