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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Mater. | doi: 10.3389/fmats.2019.00210

A Reactive Element Approach to Improve Fracture Healing in Metallic Systems

 Charles R. Fisher1, John J. Mecholsky2,  Michael S. Kesler3,  Hunter B. Henderson3 and Michele V. Manuel2*
  • 1Naval Surface Warfare Center Carderock Division, United States
  • 2University of Florida, United States
  • 3Oak Ridge National Laboratory (DOE), United States

Self-healing materials demonstrate the ability to close fractures and regain mechanical integrity after a catastrophic failure. However, self-healing in metals can be inhibited by the natural tendency for technologically-relevant metallic systems to oxidize on the crack surface. This study seeks to provide a thermodynamically-based mechanism to enhance healing capability at a solid/liquid interface through alloys designed with a reactive element alloying addition possessing a lower free energy of oxide formation than the parent element. In this study, model Sb-Cu and Sb-Zn systems enable comparisons between mechanistic behaviors based only on thermodynamic reactivity. Mechanical and microstructural investigation demonstrated that the more reactive alloying addition resulted in more effective bonding through increasing bond area and load-bearing capacity of the system. The improved bonding was attributed to improved wetting and reduction of the passivating surface oxide across an interface. The work has potential to advance self-healing capabilities in metallic systems through more appropriate alloy selection to enable improved healing.

Keywords: Interfacial bonding, Thermodynamic, Chevron notch, liquid phase, self-healing

Received: 22 Nov 2018; Accepted: 14 Aug 2019.

Copyright: © 2019 Fisher, Mecholsky, Kesler, Henderson and Manuel. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Michele V. Manuel, University of Florida, Gainesville, 32611, Florida, United States, mmanuel@mse.ufl.edu