Effects of solidification rate and temperature gradient on microstructure and crystal orientation of Co32Ni40Al28 alloys

► Co-Ni-Al oriented polycrystals are more applicable than single crystals. ► GL and V are two crucial factors in ZMLMC directional solidification. ► Higher GL and lower V benefit the realization of Co-Ni-Al coarse columnar crystals. ► Higher GL and lower V guarantee the achievement of preferred orientation.