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Title: Phase transformations of HfNbTaTiZr high-entropy alloy at intermediate temperatures

Abstract

The strong and ductile single-phase body-centered-cubic (BCC) HfNbTaTiZr refractory high-entropy alloy (RHEA) is a potential structural material for high-temperature applications. However, the BCC phase stability in the intermediate temperature range (500-900 degrees C) needs to be better understood to make this alloy applicable to industry. Here, the phase decomposition of the HfNbTaTiZr RHEA is examined at different temperatures (500-1000 degrees C). Additionally, the formation of BCC Ta-Nb-rich and hexagonal-close-packed (HCP) Hf-Zr-rich precipitates are studied as a function of annealing time at 700 degrees C using a combination of atom probe tomography, transmission electron microscopy, and X-ray diffraction. In conclusion, we found that these BCC and HCP precipitates have preferred orientations with the BCC matrix.

Authors:
 [1];  [1];  [2];  [2];  [3];  [4];  [5];  [6];  [6];  [4];  [1];  [1];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. National Tsing Hua University, Hsinchu (Taiwan)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, South Park, PA (United States)
  6. Illinois Institute of Technology, Chicago, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); National Energy Technology Lab. (NETL), Albany, OR (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; USDOE Office of Fossil Energy (FE); University of Tennessee; National Science Foundation (NSF); Ministry of Education of the People's Republic of China; Ministry of Science and Technology of the Republic of China (MOST); FE
OSTI Identifier:
1504430
Alternate Identifier(s):
OSTI ID: 1532675; OSTI ID: 1561614
Grant/Contract Number:  
AC02-06CH11357; FE0011194; AC02-05CH11231; FE0004000; AC05-00OR22725; FE-0011194
Resource Type:
Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 158; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; annealing; high-entropy alloys; phase decomposition

Citation Formats

Chen, S. Y., Tong, Y., Tseng, K. -K., Yeh, J. -W., Poplawsky, J. D., Wen, J. G., Gao, M. C., Kim, G., Chen, W., Ren, Y., Feng, R., Li, W. D., and Liaw, P. K. Phase transformations of HfNbTaTiZr high-entropy alloy at intermediate temperatures. United States: N. p., 2018. Web. doi:10.1016/j.scriptamat.2018.08.032.
Chen, S. Y., Tong, Y., Tseng, K. -K., Yeh, J. -W., Poplawsky, J. D., Wen, J. G., Gao, M. C., Kim, G., Chen, W., Ren, Y., Feng, R., Li, W. D., & Liaw, P. K. Phase transformations of HfNbTaTiZr high-entropy alloy at intermediate temperatures. United States. doi:10.1016/j.scriptamat.2018.08.032.
Chen, S. Y., Tong, Y., Tseng, K. -K., Yeh, J. -W., Poplawsky, J. D., Wen, J. G., Gao, M. C., Kim, G., Chen, W., Ren, Y., Feng, R., Li, W. D., and Liaw, P. K. Tue . "Phase transformations of HfNbTaTiZr high-entropy alloy at intermediate temperatures". United States. doi:10.1016/j.scriptamat.2018.08.032. https://www.osti.gov/servlets/purl/1504430.
@article{osti_1504430,
title = {Phase transformations of HfNbTaTiZr high-entropy alloy at intermediate temperatures},
author = {Chen, S. Y. and Tong, Y. and Tseng, K. -K. and Yeh, J. -W. and Poplawsky, J. D. and Wen, J. G. and Gao, M. C. and Kim, G. and Chen, W. and Ren, Y. and Feng, R. and Li, W. D. and Liaw, P. K.},
abstractNote = {The strong and ductile single-phase body-centered-cubic (BCC) HfNbTaTiZr refractory high-entropy alloy (RHEA) is a potential structural material for high-temperature applications. However, the BCC phase stability in the intermediate temperature range (500-900 degrees C) needs to be better understood to make this alloy applicable to industry. Here, the phase decomposition of the HfNbTaTiZr RHEA is examined at different temperatures (500-1000 degrees C). Additionally, the formation of BCC Ta-Nb-rich and hexagonal-close-packed (HCP) Hf-Zr-rich precipitates are studied as a function of annealing time at 700 degrees C using a combination of atom probe tomography, transmission electron microscopy, and X-ray diffraction. In conclusion, we found that these BCC and HCP precipitates have preferred orientations with the BCC matrix.},
doi = {10.1016/j.scriptamat.2018.08.032},
journal = {Scripta Materialia},
number = C,
volume = 158,
place = {United States},
year = {2018},
month = {8}
}

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