Journal of Metallurgy
Volume 2016 (2016), Article ID 6508597, 8 pages
http://dx.doi.org/10.1155/2016/6508597
Research Article

Bulk Mechanical Properties Testing of Metallic Marginal Glass Formers

1Department of Aerospace and Mechanical Engineering, University of Southern California, Olin Hall of Engineering 430, Los Angeles, CA 90089-1453, USA
2Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Drive, MC 0411, La Jolla, CA 92093-0411, USA
3Kazuo Inamori School of Engineering, Alfred University, 2 Pine Street, Alfred, NY 14802, USA
4Department of Chemical Engineering and Materials Science, University of Southern California, 925 Bloom Walk, HED 216, Los Angeles, CA 90089-1211, USA

Received 24 May 2016; Revised 22 July 2016; Accepted 26 July 2016

Academic Editor: Sunghak Lee

Copyright © 2016 Thien Q. Phan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We developed a unique three-point bend testing apparatus to measure bulk mechanical properties of a model metallic glass alloy (SAM2X5 with nominal composition Fe49.7Cr17.1Mn1.9Mo7.4W1.6B15.2C3.8Si2.4) prepared by spark plasma sintering. The relatively large sample sizes in the present work allowed for the preparation of test specimens with a macroscale cross section (in the millimeter range) with well-controlled sample dimensions closer to standardized tests. Wire saw cutting allowed for a relatively sharp notch radius (3x smaller than previous studies) and minimal sample damage. We determined that Young’s modulus and notch fracture toughness measured by our three-point bending apparatus are 230 GPa and 4.9 MPam1/2. Also, Vickers indentation and flexure testing provided consistent results for Young’s modulus. Indentation fracture toughness measured by Vickers indentation produced values at least 50% lower than by flexure. The microscale mechanical properties testing technique presented in this work and subsequent analyses are applicable to specimens of other compositions or ones prepared by other methods.