|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 alpha '' martensite and those with BCC structure transform to delta martensite.|
; wang, yan-dong
; lu, zhao-ping
; hui, xidong] univ sci & technol beijing, state key lab adv met & mat, beijing 100083, peoples r china. [liu, jia-peng
; nie, zhi-hua] beijing inst technol, sch mat sci & engn, beijing 100081, peoples r china. [hao, yu-lin
; wang, haoliang] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [wang, yunzhi
; wang, dong] ohio state univ, dept mat sci & engn, columbus, oh 43210 usa. [wang, yunzhi
; wang, dong] xi an jiao tong univ, frontier inst sci & technol, state key lab mech behav mat, xian 710049, peoples r china. [ren, yang] argonne natl lab, xray sci div, argonne, il 60439 usa. [wang, jinguo
; lu, ning
; kim, moon j.] univ texas dallas, dept mat sci & engn, dallas, tx 75080 usa.
; wang, yd (reprint author), univ sci & technol beijing, state key lab adv met & mat, beijing 100083, peoples r china.
J. P. Liu,Y. D. Wang,Y. L. Hao,et al. New intrinsic mechanism on gum-like superelasticity of multifunctional alloys[J]. Scientific Reports,2013,3.