Microstructure Evolution of the Cu-Cr Hypereutectic Alloys During Directional Solidification
The effects of directional solidification velocity, temperature and alloy composition on the microstructure evolution of Cu-Cr alloys were investigated systematically. The microstructure observations showed that the halo α-Cu phase formed from the Cu-rich solute neighbor to primary Cr-rich phase, and followed by the growth of rod-like coupled eutectic. The Cr-rich phase coarsened and the eutectic spacing increased with the decreasing growth velocity and the increasing solidification temperature. Further, the eutectic and the primary phase transformation temperatures in hypereutectic alloys were determined by the DSC tests. The eutectic temperature has been established to be 1079 ± 0.5 °C.
KeywordsSolidification Microstructure evolution Interface Cu-Cr alloys Solidification velocity Solidification temperature
This research was supported by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Korean Government (MCIE), the National Research Foundation of Korea (NRF) funded by the Korean Government (MEST) (No.2011-0030801) and the Fund for Young Scholars of Taiyuan University of Technology (No. 2012L053).
- 1.Zhou ZM, Wang YP, Gao J, Kolbe M (2005) Microstrue of rapidly solidified Cu-25wt.% Cr alloys. Mater Sci Eng A 398:318–322Google Scholar
- 4.Gao J, Wang YP, Zhou ZM, Kolbe M (2007) Phase separation in undercooled Cu-Cr melts. Mater Sci Eng A 449–451:654–657Google Scholar
- 9.Kofler A (1965) Precipitation anomalies during isothermal crystallization from undercooled binary organic melts. J Aust Inst Met 10:132Google Scholar
- 11.Sundquist BE, Bruscato R, Mondolfo LF (1962–1963) The surface energy of solid metals. J Inst Met 91:204Google Scholar
- 14.Milenkovic S, Schneider A, Frommeyer G (2011) Constitutional and microstructural investigation of the pseudobinary NiAl–W system. Intermetallics 19:342–349Google Scholar