Abstract
CoCrNi multi-principal element alloys (MPEAs) have potential as high toughness, blast resistant materials, but limited studies of their high strain rate behavior have been performed. Their high toughness has been attributed to low stacking fault energies and the activation of toughness enhancing deformation mechanisms, such as twinning- and transformation-induced plasticity (TWIP and TRIP, respectively), that may be affected by increased strain rate. This work examines a series of CoCrNi MPEAs tested with a miniaturized pressure bar, while simultaneous synchrotron X-ray diffraction and imaging are performed, and compares these results to those collected during quasi-static deformation at elevated temperatures. The collected diffraction indicates that TRIP was active at elevated strain rates for the most Co-rich alloys containing 50 or 55 at. pct. Co, while TRIP behavior was suppressed at elevated strain rates in a 40 at. pct. Co alloy anticipated to experience TRIP. The suppression of TRIP in the lower Co alloy at high strain rates is attributed to adiabatic heating, consistent with suppression of TRIP as a result of elevated temperatures.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1821-1830 |
| Number of pages | 10 |
| Journal | Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science |
| Volume | 53 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2022 |
Funding
This work was supported by the U.S. Department of the Navy, Office of Naval Research under ONR Award Number N00014-18-1-2567. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the Office of Naval Research. FGC, JKT, and KDC acknowledge support by the Center for Advanced Non-Ferrous Structural Alloys (CANFSA), a National Science Foundation Industry/University Cooperative Research Center (I/UCRC) [Award No. 1624836], at the Colorado School of Mines (Mines). FGC also acknowledges CNPq, Conselho Nacional de Desenvolvimento Científico e Tecnológico - Brasil (CNPq) [Grant Number 424645/2018-1]. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357; synchrotron X-ray data were collected at the Sector 32-ID beamline. This research also used resources of the Brazilian Synchrotron Light Laboratory (LNLS), an open national facility operated by the Brazilian Centre for Research in Energy and Materials (CNPEM) for the Brazilian Ministry for Science, Technology, Innovations and Communications (MCTIC). The XTMS beamline staff and Diego Santana, André Vidilli and Lucas Otani are gratefully acknowledged for their assistance during the experiments. We also gratefully acknowledge Dr. Yaofeng Guo stacking fault energy measurements and Gus Becker, Christopher Finfrock, Yaofeng Guo, Chloe Johnson, Brian Milligan, Connor Rietema, Alec Saville, and Doug Smith at Mines and Jinling Gao at Purdue University for their help performing high strain rate testing at the APS. On behalf of all authors, the corresponding author states that there is no conflict of interest. This work was supported by the U.S. Department of the Navy, Office of Naval Research under ONR Award Number N00014-18-1-2567. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the Office of Naval Research. FGC, JKT, and KDC acknowledge support by the Center for Advanced Non-Ferrous Structural Alloys (CANFSA), a National Science Foundation Industry/University Cooperative Research Center (I/UCRC) [Award No. 1624836], at the Colorado School of Mines (Mines). FGC also acknowledges CNPq, Conselho Nacional de Desenvolvimento Científico e Tecnológico - Brasil (CNPq) [Grant Number 424645/2018-1]. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357; synchrotron X-ray data were collected at the Sector 32-ID beamline. This research also used resources of the Brazilian Synchrotron Light Laboratory (LNLS), an open national facility operated by the Brazilian Centre for Research in Energy and Materials (CNPEM) for the Brazilian Ministry for Science, Technology, Innovations and Communications (MCTIC). The XTMS beamline staff and Diego Santana, André Vidilli and Lucas Otani are gratefully acknowledged for their assistance during the experiments . We also gratefully acknowledge Dr. Yaofeng Guo stacking fault energy measurements and Gus Becker, Christopher Finfrock, Yaofeng Guo, Chloe Johnson, Brian Milligan, Connor Rietema, Alec Saville, and Doug Smith at Mines and Jinling Gao at Purdue University for their help performing high strain rate testing at the APS.
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys