Effects of nanoprecipitation on the shape memory and material properties of an Ni-rich NiTiHf high temperature shape memory alloy

被引：243
作者：
Karaca, H. E. [1 ]
Saghaian, S. M. [1 ]
Ded, G. [1 ]
Tobe, H. [1 ]
Basaran, B. [1 ,2 ]
Maier, H. J. [3 ]
Noebe, R. D. [4 ]
Chumlyakov, Y. I. [5 ]
机构：
[1] Univ Kentucky, Dept Mech Engn, Lexington, KY 40506 USA
[2] Univ Turkish Aeronaut Assoc, TR-06790 Ankara, Turkey
[3] Univ Hannover, Inst Werkstoffkunde, D-30823 Garbsen, Germany
[4] NASA, Glenn Res Ctr, Struct & Mat Div, Cleveland, OH 44135 USA
[5] Tomsk State Univ, Siberian Phys Tech Inst, Tomsk 634050, Russia
来源：
ACTA MATERIALIA | 2013年 / 61卷 / 19期
关键词：
Shape memory alloys; Phase transformations; High temperature; NiTiHf; Mechanical tests; INDUCED MARTENSITIC-TRANSFORMATION; PHASE-TRANSFORMATION; SINGLE-CRYSTALS; HF; MICROSTRUCTURE; PRECIPITATION; BEHAVIOR; TENSION;
D O I：
10.1016/j.actamat.2013.08.048
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Shape memory properties of a Ni50.3Ti29.7Hf20 (at.%) polycrystalline alloy were characterized after selected heat treatments. The effects of heat treatment temperature and time on the transformation temperatures (TTs) and temperature hysteresis were determined by differential scanning calorimetry. Thermal cycling under constant compressive stress was carried out to reveal the changes in transformation strain, temperature hysteresis, and TT as a function of stress. Isothermal stress cycling experiments were conducted to reveal the critical stresses, transformation strain, and stress hysteresis as a function of temperature. The crystal structure and lattice parameters of the transforming phases were determined by X-ray diffraction at selected temperatures. Precipitate characteristics and martensite morphology were revealed by transmission electron microscopy. Precipitation was found to alter the martensite morphology and significantly improve the shape memory properties of the Ni-rich NiTiHf alloy. For the peak aged condition shape memory strains of up to 3.6%, the lowest hysteresis, and a fully reversible superelastic response were observed at temperatures up to 240 C. In general, the nickel-rich NiTiHf polycrystalline alloy exhibited a higher work output (approximate to 16.5 J cm(-3)) than other NiTi-based high temperature alloys. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页码：7422 / 7431
页数：10
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