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Title: Processing and consolidation of copper/tungsten

Here, we developed a copper/tungsten (Cu/W) composite for mesoscale Materials Science applications using the novel High-Energy Diffraction Microscopy (HEDM) technique. Argon-atomized copper powder was selected as the starting raw powder and screened to remove the extremely large particle fraction. Tungsten particles were collected by milling and screening the -325 mesh tungsten powder between 500 and 635 mesh sieves. Hot pressing of screened Cu powder was performed at 900 °C in Ar/4 %H 2 atmosphere. XRD and ICP results show that the hot-pressed Cu sample consists of about 5 vol% Cu 2O, which is caused by the presence of oxygen on the surface of the starting Cu powder. Hot pressing the copper powder in a pure hydrogen atmosphere was successful in removing most of the surface oxygen. Our process was also implemented for hot pressing the Cu/W composite. The density of the Cu/W composites hot pressed at 950 °C in pure hydrogen was about 94 % of the theoretical density (TD). The hot-pressed Cu/W composites were further hot isostatic pressed at 1050 °C in argon atmosphere, which results in 99.6 % of the TD with the designed Cu grain size and W particle distribution. Tensile specimens with D-notch were machined usingmore » the wire EDM method. Furthermore, the processing and consolidation of these materials will be discussed in detail. The HEDM images are also showed and discussed.« less
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [1] ;  [1] ; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-17-24549; LA-UR-17-27920
Journal ID: ISSN 0022-2461; TRN: US1703130
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Journal of Materials Science
Additional Journal Information:
Journal Volume: 52; Journal Issue: 2; Journal ID: ISSN 0022-2461
Publisher:
Springer
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; copper tungsten processing density; Polycrystalline, Ceramic, Transparent, Processing,
OSTI Identifier:
1406225
Alternate Identifier(s):
OSTI ID: 1407905

Chen, Ching-Fong, Pokharel, Reeju, Brand, Michael J., Tegtmeier, Eric L., Clausen, Bjorn, Dombrowski, David E., Ickes, T. L., and Lebensohn, Ricardo A.. Processing and consolidation of copper/tungsten. United States: N. p., Web. doi:10.1007/s10853-016-0413-7.
Chen, Ching-Fong, Pokharel, Reeju, Brand, Michael J., Tegtmeier, Eric L., Clausen, Bjorn, Dombrowski, David E., Ickes, T. L., & Lebensohn, Ricardo A.. Processing and consolidation of copper/tungsten. United States. doi:10.1007/s10853-016-0413-7.
Chen, Ching-Fong, Pokharel, Reeju, Brand, Michael J., Tegtmeier, Eric L., Clausen, Bjorn, Dombrowski, David E., Ickes, T. L., and Lebensohn, Ricardo A.. 2016. "Processing and consolidation of copper/tungsten". United States. doi:10.1007/s10853-016-0413-7. https://www.osti.gov/servlets/purl/1406225.
@article{osti_1406225,
title = {Processing and consolidation of copper/tungsten},
author = {Chen, Ching-Fong and Pokharel, Reeju and Brand, Michael J. and Tegtmeier, Eric L. and Clausen, Bjorn and Dombrowski, David E. and Ickes, T. L. and Lebensohn, Ricardo A.},
abstractNote = {Here, we developed a copper/tungsten (Cu/W) composite for mesoscale Materials Science applications using the novel High-Energy Diffraction Microscopy (HEDM) technique. Argon-atomized copper powder was selected as the starting raw powder and screened to remove the extremely large particle fraction. Tungsten particles were collected by milling and screening the -325 mesh tungsten powder between 500 and 635 mesh sieves. Hot pressing of screened Cu powder was performed at 900 °C in Ar/4 %H2 atmosphere. XRD and ICP results show that the hot-pressed Cu sample consists of about 5 vol% Cu2O, which is caused by the presence of oxygen on the surface of the starting Cu powder. Hot pressing the copper powder in a pure hydrogen atmosphere was successful in removing most of the surface oxygen. Our process was also implemented for hot pressing the Cu/W composite. The density of the Cu/W composites hot pressed at 950 °C in pure hydrogen was about 94 % of the theoretical density (TD). The hot-pressed Cu/W composites were further hot isostatic pressed at 1050 °C in argon atmosphere, which results in 99.6 % of the TD with the designed Cu grain size and W particle distribution. Tensile specimens with D-notch were machined using the wire EDM method. Furthermore, the processing and consolidation of these materials will be discussed in detail. The HEDM images are also showed and discussed.},
doi = {10.1007/s10853-016-0413-7},
journal = {Journal of Materials Science},
number = 2,
volume = 52,
place = {United States},
year = {2016},
month = {9}
}