Affiliation:
1. Department of Mechanical and Materials Engineering University of Nebraska‐Lincoln Lincoln Nebraska USA
2. Idaho National Laboratory Idaho Falls Idaho USA
3. Department of Nuclear Engineering North Carolina State University Raleigh North Carolina USA
4. Department of Electrical & Computer Engineering University of Nebraska‐Lincoln Lincoln Nebraska USA
5. Nebraska Center for Materials and Nanoscience University of Nebraska‐Lincoln Lincoln Nebraska USA
Abstract
AbstractTwo advanced manufacturing processes, spark plasma sintering (SPS) and selective laser sintering (SLS), have been developed for synthesis of (Zr,Nb,Ta,Ti,W)C compositionally complex carbide (CCC) via reactive sintering of a powder mixture of constitute monocarbides. X‐ray diffraction analysis confirmed that the single‐phase CCC can be formed by both SPS and SLS. While a homogenous microstructure with uniform metal element distributions was developed during SPS, three‐layer microstructures with a thin TiC‐rich layer and two TaC‐rich layers along with a TiO2‐rich surface layer containing W nanoparticles were formed during SLS. In addition, cellular structures with W, Zr, and Ti element segregation and dislocations on cell boundaries were observed in the SLS‐CCC sample, indicating the effect of nonequilibrium conditions on microstructure formation during laser melting followed by rapid cooling and solidification process. Compared to the SPS‐CCC sample, the SLS‐CCC showed enhanced hardness and reduced thermal conductivity, which may be related to their unique cellular structures.
Funder
Office of the Under Secretary of Defense for Research and Engineering
Air Force Office of Scientific Research
Laboratory Directed Research and Development
National Science Foundation