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Title: New intrinsic mechanism on gum-like superelasticity of multifunctional alloys

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep02156· OSTI ID:1624631
 [1];  [2];  [3];  [4];  [5];  [4];  [6];  [2];  [7];  [3];  [2];  [7];  [7];  [3]
  1. Univ. of Science and Technology, Beijing (China). State key Lab. for Advanced Metals and Materials; Beijing Inst. of Technology, Beijing (China). School of Materials Science and Engineering
  2. Univ. of Science and Technology, Beijing (China). State key Lab. for Advanced Metals and Materials
  3. Chinese Academy of Sciences (CAS), Shenyang (China). Inst. of Metal Research. Shenyang National Lab. for Materials Science
  4. The Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering; Xi'an Jiaotong Univ., Shaanxi (China). State Key lab. for Mechanical Behavior of Materials. Frontier Inst. of Science and Technology
  5. Beijing Inst. of Technology, Beijing (China). School of Materials Science and Engineering
  6. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Division
  7. Univ. of Texas at Dallas, Richardson, TX (United States). Dept. of Materials Science and Engineering
+ Show Author Affiliations

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 a0 martensite and those with BCC structure transform to d martensite.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1624631
Journal Information:
Scientific Reports, Vol. 3, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

The Role of Nano-domains in {1–011} Twinned Martensite in Metastable Titanium Alloys journal August 2018
Tailoring superelasticity of soft magnetic materials journal October 2015
From Porous to Dense Nanostructured β-Ti alloys through High-Pressure Torsion journal October 2017
Guided Self-Assembly of Nano-Precipitates into Mesocrystals journal November 2015

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