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superelasticity and Tunable thermal expansion across a Wide temperature Range

Journal of Materials Science & Technology 2016年第8期32卷 705-709页

作者： Y.L. Hao H.L. Wang T. Li J.M. Cairney A.V. Ceguerra Y.D. Wang Y. Wang D. Wang E.G. Obbard S.J. Li R. Yang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Aerospace Mechanical & Mechatronic Engineering University of Sydney Sydney NSW2006 Australia Australian Centre for Microscopy and Microanalysis University of Sydney Sydney HSW2006 Australia State Key Laborotory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China State Key Laboratory for Mechanical behavior of Materials and Frontier Institute of Science and Technology Xi'an Jiaotong Univemity Xi'an 710049 China Department of Materials Science and engineering Ohio State University Columbus OH 43210 USA Department of Electrical engineering and Telecommunications University of New South Wales Sydney NSW2052 Australia

Materials that undergo a reversible change of crystal structure through martensitic transformation （MT） possess unusual functionalities including shape memory, superelasticity, and low/negative thermal ex- pansion. These properties have many advanced applications, such as actuators, sensors, and energy conversion, but are limited typically in a narrow temperature range of tens of Kelvin. Here we report that, by creating a nano-scale concentration modulation via phase separation, the MT can be rendered continuous by an in-situ elastic confinement mechanism. Through a model titanium alloy, we demon- strate that the elastically confined continuous MT has unprecedented properties, such as superelasticity from below 4.2 K to 500 K, fully tunable and stable thermal expansion, from positive, through zero, to negative, from below 4.2 K to 573 K, and high strength-to-modulus ratio across a wide temperature range. The elastic tuning on the MT, together with a significant extension of the crystal stability limit, provides new opportunities to explore advanced materials.

关键词： ti alloy superelasticity thermal expansion behavior temperature characteristic

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