Martensitic transformation and properties of in-situ NiTi-W composite

doi:10.13251/j.issn.0254-6051.2020.06.029

Abstract

Abstract: In order to obtain high performance NiTi based composite, an in-situ NiTi-W composite was prepared by means of vacuum arc melting, hot forging and wire drawing. Microstructure of the composite was observed by means of SEM. Reversible martensitic transformation behavior was measured by DSC, and tensile tests were conducted on WDT II-20 testing machine. SEM results show that the W fibers are refined to a few microns or even submicron scale and are elongated along the drawing direction. DSC test results show that the material shows complex reversible martensitic transformation behavior after annealing at different temperatures, and many heat absorption and desorption peaks are observed on heating and cooling thermal cycles curves. Tensile tests reveal that the yield strength of 600 ℃ annealed specimen increases greatly from about 200 MPa to about 800 MPa after pre-stretching deformation, the fracture stress is more than 1 GPa, and the fracture strain is as high as 40%. Furthermore, the specimen shows excellent linear hyperelasticity. Therefore, the composite should be a high-performance material with high strength, high plasticity and high linear hyperelasticity.

Key words: NiTi-W in-situ composite, martensitic transformation, linear superelasticity

CLC Number:

TB34

Jiang Jiang, Jiang Daqiang, Hao Shijie, Jiang Xiaohua, Guo Fangmin, Cui Lishan. Martensitic transformation and properties of in-situ NiTi-W composite[J]. Heat Treatment of Metals, 2020, 45(6): 136-140.

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