Shock Wave Response of Iron-based In Situ Metallic Glass Matrix Composites
Abstract
The response of amorphous steels to shock wave compression has been explored for the first time. Further, the effect of partial devitrification on the shock response of bulk metallic glasses is examined by conducting experiments on two iron-based in situ metallic glass matrix composites, containing varying amounts of crystalline precipitates, both with initial composition Fe_(49.7)Cr_(17.7)Mn_(1.9)Mo_(7.4)W_(1.6)B_(15.2)C_(3.8)Si_(2.4). The samples, designated SAM2X5-600 and SAM2X5-630, are X-ray amorphous and partially crystalline, respectively, due to differences in sintering parameters during sample preparation. Shock response is determined by making velocity measurements using interferometry techniques at the rear free surface of the samples, which have been subjected to impact from a high-velocity projectile launched from a powder gun. Experiments have yielded results indicating a Hugoniot Elastic Limit (HEL) to be 8.58 ± 0.53 GPa for SAM2X5-600 and 11.76 ± 1.26 GPa for SAM2X5-630. The latter HEL result is higher than elastic limits for any BMG reported in the literature thus far. SAM2X5-600 catastrophically loses post-yield strength whereas SAM2X5-630, while showing some strain-softening, retains strength beyond the HEL. The presence of crystallinity within the amorphous matrix is thus seen to significantly aid in strengthening the material as well as preserving material strength beyond yielding.
Additional Information
© 2016 Nature Publishing Group. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Received: 05 October 2015; Accepted: 18 February 2016; Published online: 02 March 2016. Prof. G. Ravichandran of GALCIT at the California Institute of Technology is sincerely acknowledged for his help with plate impact experiments. Many thanks to Dr. I-Chung Chen and Mr. A. Lindo of the University of Southern California for their help with material characterization. This work was done under the auspices of grant HDTRA1-11-1-0067 awarded by the Defense Threat Reduction Agency (DTRA). Author Contributions: G.R.K. and V.E. conceived the shock compression experiments; G.R.K. and M.B.R. conducted the shock compression experiments; J.P.K. and O.A.G. designed and manufactured the samples; G.R.K., A.M.H., J.P.K. and O.A.G. characterized the samples; G.R.K., V.E., J.P.K. and O.A.G. analyzed the results. All authors reviewed the manuscript. The authors declare no competing financial interests.Attached Files
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Additional details
- PMCID
- PMC4773851
- Eprint ID
- 65113
- Resolver ID
- CaltechAUTHORS:20160307-104818484
- HDTRA1-11-1-0067
- Defense Threat Reduction Agency (DTRA)
- Created
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2016-03-08Created from EPrint's datestamp field
- Updated
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2022-05-06Created from EPrint's last_modified field