Browsing by Author "Wang, Y. -D"
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Item New Intrinsic Mechanism on Gum-Like Superelasticity of Multifunctional AlloysLiu, J. -P; Wang, Y. -D; Hao, Y. -L; Wang, Y.; Nie, Z. -H; Wang, D.; Ren, Y.; Lu, Z. -P; Wang, Jinguo; Wang, H.; Hui, X.; Lu, Ning; Kim, Moon J.; Yang, R.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 ō martensite.