The effect of Anti-Phase Domain Size on the Ductility of a Rapidly Solidified Ni 3 Al-Cr Alloy
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THE EFFECT OF ANTI-PHASE DOMAIN SIZE ON THE DUCTILITY OF A RAPIDLY SOLIDIFIED Ni 3 Al-Cr ALLOY
G.CARRO, G.A.BERTERO, J.E.WlTTIG, and W.F.FLANAGAN Department of Materials Science and Engineering Vanderbilt University, Nashville, TN 37235
Abstract Tensile tests on splat-quenched Ni Al-Cr alloys showed a sharp decrease in ductility with long-time annealing. The growth of the initially very-fine size anti-phase domains showed a tenuous correlation with ductility up to a critical size, where ductility was lost. The grain size was relatively unaffected by these annealing treatments, but the grain-boundary curvature decreased, implying less toughness. An important observation was that for the longest annealing time a chromium-rich precipitate formed, which our data indicate could be a boride. Miniaturized tensile tests were performed on samples which were all obtained from the same splat-quenched foil, and the various domain sizes were controlled by subsequent annealing treatments. Introduction It has been proposed that the presence of anti-phase domains (APDs) imparts ductility to polycrystalline Ni 3 AI-base alloys [1-3]. Strong supporting evidence of this hypothesis is the work by Inoue et al [3], in which elongations ranging from 4 to 27% were reported for boron-free Ni 3 AIX (X=Cr,Mn,Fe,Co,Si) in the form of rapidly solidified thin wires. The microstructure of these wires was comprised of small grains (
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