|Abstract||Two main explanations exist for the deformation mechanisms in Ti-Nb-based gum metals, i.e. the formation of reversible nanodisturbance and reversible stress-induced martensitic transformation. In this work, we used the in situ synchrotron-based high-energy X-ray diffuse-scattering technique to reveal the existence of a specific deformation mechanism, i.e. deformation-induced spatially confined martensitic transformations, in Ti-24Nb-4Zr-8Sn-0.10O single crystals with cubic 13 parent phase, which explains well some anomalous mechanical properties of the alloy such as low elastic modulus and nonlinear superelasticity. Two kinds of nanosized martensites with different crystal structures were found during uniaxial tensile loading along the [11 0](beta) axis at room temperature and 190 K, respectively. The detailed changes in the martensitic phase transformation characteristics and the transformation kinetics were experimentally observed at different temperatures. The domain switch from non-modulated martensite to a modulated one occurred at 190 K, with its physical origin attributed to the heterogeneity of local phonon softening depending on temperature and inhomogeneous composition in the parent phase. An in-depth understanding of the formation of stress-induced spatially confined nanosized martensites with a large gradient in chemical composition may benefit designs of high-strength and high-ductility alloys. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.|
|description.department||[liu, j. p.
; nie, z. h.
; su, r.
; lu, z. p.
; hui, x. d.] beijing inst technol, sch mat sci & engn, beijing 100081, peoples r china. [liu, j. p.
; wang, y. d.
; su, r.] univ sci & technol beijing, state key lab adv met & mat, beijing 100083, peoples r china. [hao, y. l.
; wang, h. l.
; yang, r.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [wang, y.
; wang, d.] ohio state univ, dept mat sci & engn, columbus, oh 43210 usa. [wang, y.
; wang, d.] xi an jiao tong univ, frontier inst sci & technol, state key lab mech behav mat, xian 710049, peoples r china. [ren, y.] argonne natl lab, xray sci div, argonne, il 60439 usa. [wang, j. g.] univ texas richardson, 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. High-energy X-ray diffuse scattering studies on deformation-induced spatially confined martensitic transformations in multifunctional Ti-24Nb-4Zr-8Sn alloy[J]. Acta Materialia,2014,81:476-486.
J. P. Liu.,Y. D. Wang.,Y. L. Hao.,H. L. Wang.,Y. Wang.,...&R. Yang.(2014).High-energy X-ray diffuse scattering studies on deformation-induced spatially confined martensitic transformations in multifunctional Ti-24Nb-4Zr-8Sn alloy.Acta Materialia,81,476-486.