Journal
JOM
Volume 70, Issue 8, Pages 1589-1597Publisher
SPRINGER
DOI: 10.1007/s11837-018-2920-2
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Funding
- U.S. Department of Energy (DOE) by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- Laboratory Directed Research and Development (LDRD) Program [18-SI-003]
- A.J.C.'s Early Career Award from the U.S. DOE, Office of Science, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0016061]
- Exascale Computing Project, a collaborative effort of the U.S. DOE, Office of Science [17-SC-20-SC]
- National Nuclear Security Administration
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Single-track laser melting experiments were performed on bulk Ti-Nb alloys to explore process parameters and the resultant macroscopic structure and microstructure. The microstructures in Ti-20Nb and Ti-50Nb (at.%) alloys exhibited cellular growth during rapid solidification, with average cell size of approximately 0.5 A mu m. Solidification velocities during cellular growth were calculated from images of melt tracks. Measurements of the composition in the cellular and intercellular regions revealed nonequilibrium partitioning and its dependence on velocity during rapid solidification. Experimental results were used to benchmark a phase-field model to describe rapid solidification under conditions relevant to additive manufacturing.
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