Ductilizing Bulk Metallic Glass Composite by Tailoring Stacking Fault Energy

Y. Wu, D. Q. Zhou, W. L. Song, H. Wang, Z. Y. Zhang, D. Ma, X. L. Wang, and Z. P. Lu
Phys. Rev. Lett. 109, 245506 – Published 14 December 2012
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Abstract

Martensitic transformation was successfully introduced to bulk metallic glasses as the reinforcement micromechanism. In this Letter, it was found that the twinning property of the reinforcing crystals can be dramatically improved by reducing the stacking fault energy through microalloying, which effectively alters the electron charge density redistribution on the slipping plane. The enhanced twinning propensity promotes the martensitic transformation of the reinforcing austenite and, consequently, improves plastic stability and the macroscopic tensile ductility. In addition, a general rule to identify effective microalloying elements based on their electronegativity and atomic size was proposed.

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  • Received 17 January 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.245506

© 2012 American Physical Society

Authors & Affiliations

Y. Wu1, D. Q. Zhou1, W. L. Song1, H. Wang1, Z. Y. Zhang1, D. Ma2, X. L. Wang3, and Z. P. Lu1,*

  • 1State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
  • 2Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 3Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, China

  • *luzp@ustb.edu.cn

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Vol. 109, Iss. 24 — 14 December 2012

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