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Title: Lightweight TiC–(Fe–Al) ceramic–metal composites made in situ by pressureless melt infiltration

Abstract

Lightweight ceramic–metal (cermet) composites combine stiffness and hardness with fracture toughness and ductility. TiC and Al are ideal pairs among lightweight cermet composites because of their relatively high strength-to-weight ratios, but these materials are difficult to process in solid state or with Al melt infiltration without making an aluminum carbide phase, which is detrimental to mechanical properties. Here, Fe is added to a TiC powder preform to reduce the activity of Al with TiC during Al melt infiltration and to aid in pressing TiC preforms, making a lightweight TiC–(Fe–Al) composite while avoiding other, unwanted phases. The composites are made by first pressing TiC powder mixed with Fe followed by Al melt infiltration; the result is a composite with high TiC content in a two-phase matrix, both of which are Fe–Al-based. The composite has low density, low porosity, high hardness, no detectable Al 4C 3 phase with X-ray diffraction and retains shape well during infiltration.

Authors:
ORCiD logo; ; ORCiD logo; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1543216
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Science
Additional Journal Information:
Journal Volume: 54; Journal Issue: 19; Journal ID: ISSN 0022-2461
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Ceramic-metal (cermet) composites; Intermetallics; Melt infiltration; TiC

Citation Formats

Cramer, Corson L., Edwards, Makayla S., McMurray, Jacob W., Elliott, Amy M., and Lowden, Richard A. Lightweight TiC–(Fe–Al) ceramic–metal composites made in situ by pressureless melt infiltration. United States: N. p., 2019. Web. doi:10.1007/s10853-019-03792-2.
Cramer, Corson L., Edwards, Makayla S., McMurray, Jacob W., Elliott, Amy M., & Lowden, Richard A. Lightweight TiC–(Fe–Al) ceramic–metal composites made in situ by pressureless melt infiltration. United States. doi:10.1007/s10853-019-03792-2.
Cramer, Corson L., Edwards, Makayla S., McMurray, Jacob W., Elliott, Amy M., and Lowden, Richard A. Mon . "Lightweight TiC–(Fe–Al) ceramic–metal composites made in situ by pressureless melt infiltration". United States. doi:10.1007/s10853-019-03792-2.
@article{osti_1543216,
title = {Lightweight TiC–(Fe–Al) ceramic–metal composites made in situ by pressureless melt infiltration},
author = {Cramer, Corson L. and Edwards, Makayla S. and McMurray, Jacob W. and Elliott, Amy M. and Lowden, Richard A.},
abstractNote = {Lightweight ceramic–metal (cermet) composites combine stiffness and hardness with fracture toughness and ductility. TiC and Al are ideal pairs among lightweight cermet composites because of their relatively high strength-to-weight ratios, but these materials are difficult to process in solid state or with Al melt infiltration without making an aluminum carbide phase, which is detrimental to mechanical properties. Here, Fe is added to a TiC powder preform to reduce the activity of Al with TiC during Al melt infiltration and to aid in pressing TiC preforms, making a lightweight TiC–(Fe–Al) composite while avoiding other, unwanted phases. The composites are made by first pressing TiC powder mixed with Fe followed by Al melt infiltration; the result is a composite with high TiC content in a two-phase matrix, both of which are Fe–Al-based. The composite has low density, low porosity, high hardness, no detectable Al4C3 phase with X-ray diffraction and retains shape well during infiltration.},
doi = {10.1007/s10853-019-03792-2},
journal = {Journal of Materials Science},
number = 19,
volume = 54,
place = {United States},
year = {2019},
month = {7}
}

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