A New Sight of the Growth Characteristics of Solidified Al3Ni at the Liquid-Solid Interface by Synchrotron Radiography and 3D Tomography

摘要

The growth mechanisms of single- and variant-flake Al3Ni phases at the liquid Al/solid Ni interface during solidification were investigated by synchrotron radiography and 3D tomography. The single-flake Al3Ni in the form of an elongated diamond rod evolves from one needle-like grain. The variant-flake Al3Ni is formed by coalescence of several needle-like Al3Ni grains, and its growth is dominated by the creation and propagation of a pair or groups of screw dislocations with opposite signs.