Title |
New intrinsic mechanism on gum-like superelasticity of multifunctional alloys
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Published in |
Scientific Reports, July 2013
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DOI | 10.1038/srep02156 |
Pubmed ID | |
Authors |
Jia-Peng Liu, Yan-Dong Wang, Yu-Lin Hao, Yunzhi Wang, Zhi-Hua Nie, Dong Wang, Yang Ren, Zhao-Ping Lu, Jinguo Wang, Haoliang Wang, Xidong Hui, Ning Lu, Moon J. Kim, Rui Yang |
Abstract |
Ti-Nb-based Gum Metals exhibit extraordinary superelasticity with ultralow elastic modulus, superior strength and ductility, and a peculiar dislocation-free deformation behavior, most of which challenge existing theories of crystal strength. Additionally, this kind of alloys actually displays even more anomalous mechanical properties, such as the non-linear superelastic behavior, accompanied by a pronounced tension-to-compression asymmetry, and large ductility with a low Poisson's ratio. Two main contradictory arguments exist concerning the deformation mechanisms of those alloys, i.e., formation of reversible nanodisturbance and reversible martensitic transformation. Herein we used the in-situ synchrotron high-energy X-ray scattering technique to reveal the novel intrinsic physical origin of all anomalous mechanical properties of the Ti-24Nb-4Zr-8Sn-0.10O alloy, a typical gum-like metal. Our experiments provide direct evidence on two different kinds of interesting, stress-induced, reversible nanoscale martensitic transitions, i.e., the austenitic regions with B2 structure transform to α″ martensite and those with BCC structure transform to δ martensite. |
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