Development of Microstructure and Texture in Rapidly Solidified and Annealed Ni-Al Alloys

Abstract

Development of microstructure and crystal orientation distribution in melt-spun and subsequently annealed Ni–36 at%Al and Ni–38 at%Al alloy ribbons was investigated. In Ni–36 at%Al ribbon, the martensitic transformation from β to β^′ phase occurred during rapid cooling showing strong ⟨110⟩_β^′ fiber texture, while β phase with strong ⟨100⟩_β texture was frozen in Ni–38 at%Al ribbon. During annealing at 1073 K, a peculiar fiber texture of strong ⟨100⟩_β and ⟨110⟩_γ^′ texture was developed in Ni–36 at%Al ribbon. Formation of the texture was discussed focusing on the initial microstructure and the orientation relationship between phases during phase transformation.