Journal
SCIENTIFIC REPORTS
Volume 3, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep02156
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Funding
- National Basic Research Program of China (973 Program) [2012CB619405, 2012CB933901, 2012CB619103]
- National Natural Science Foundation of China [51231002, 51071152, 51271180, 51201125]
- Fundamental Research Funds for the Central Universities [06111020]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Science [DE-AC02-06CH11357]
- U.S. Natural Science Foundation [DMR-1008349]
- National Basic Research Program of China [2012CB619402, 2010CB631003]
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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 alpha '' martensite and those with BCC structure transform to delta martensite.
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