The solidification of undercooled melts via twinned dendritic growth

The solidification of undercooled Cu-x wt.% Sn (x = 1, 2, 3, 4) alloys has been studied by a melt encasement (fluxing) technique. It was found that below undercoolings of DeltaT approximate to 90 K the preferred dendrite growth orientation in each of these alloys was along the <111> direction. Moreover the 2 and 3 wt.% Sn alloys also displayed evidence of twinned growth. Above DeltaT approximate to 90K the preferred growth direction returned to the more usual <100> orientation. (C) 2003 Elsevier B.V. All rights reserved.