Enhanced room-temperature tensile ductility of columnar-grained polycrystalline Cu-12 wt.%Al alloy through texture control by Ohno continuous casting process

The Ohno continuous casting (OCC) process is a practical way to control the solidification texture of Cu-12 wt. %Al alloy with a perfect < 001 >beta fiber texture along the solidification direction. Compared with the conventional randomly oriented polycrystalline Cu-12 wt.%Al alloy, the reorientation of beta' martensite and stress-induced phase transformation occurred at the same time within every columnar grain sharing the same [001]beta orientation during tensile test, which would reduce the elastical and phase-transformational incompatibility and enhance the intergranular accommodation. As a consequence, a high tensile ductility up to 28% with transgranular fracture can be obtained for OCC columnar-grained Cu-12 wt.%Al alloy instead of intergranular fracture due to the incompatible stress at the grain boundary for randomly oriented polycrystalline Cu-12 wt%Al alloy. (C) 2011 Elsevier B.V. All rights reserved.