Journal
ACTA MATERIALIA
Volume 145, Issue -, Pages 71-83Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.11.040
Keywords
Rapid solidification; TEM; PED; ACOM; Interface velocity; Absolute stability
Funding
- U.S. Department of Energy [DE-AC52-07NA27344]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Materials Science and Engineering [FWP SCW0974]
- National Science Foundation, Division of Materials Research, Metals & Metallic Nanostructures program [DMR 1105757, DMR 1607922]
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Rapid solidification can produce metastable phases and unusual microstructure modifications in multi component alloys during additive manufacturing or laser beam welding. Composition and phase mapping by transmission electron microscopy have been used here to characterize the morphologically distinct zones developing in hypoeutectic Al-4 at.% Cu alloy after pulsed laser melting for different crystal growth rate regimes. Deviations of the compositions of the alloy phases from equilibrium predictions and unique orientation relationships between the solidification transformation products have been determined. Specifically, for the columnar growth zone at solidification rates of 0.8m s(-1) < v
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