Phase and Structural Transformations in the Alloys Based on Monoaluminide of Nickel

• Main Author: S. V. Kositsyn, I. I. Kositsyna
• Format: Article
• Language: English
• Published: G. V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine 2008-06-01
• Series: Успехи физики металлов
• Online Access: https://doi.org/10.15407/ufm.09.02.195

The aim of the present work is to study physical and mechanical properties of nickel monoaluminide, its behaviour during plastic deformation, solid solutions based on NiAl (β-phase), solubility of alloying elements in nickel monoaluminide, and the effect of alloying elements on the structure and properties of the β-phase. Results reported by V.S. Litvinov and K. Enami as well as our data underlie the consideration of the temperature-and-concentration range of the martensitic transformation in Ni–Al system, its reversibility, transformation crystallography, the effect of alloying elements on martensitic points, and structural features of the martensitic transformation in the β-phase at different degrees of supersaturation with nickel, chromium, and cobalt. The β-phase instability, which is concerned with the formation of low-symmetry superstructures, and conditions, which are necessary for the formation and growth of these Ni5Al3 and Ni2Al superstructures in Ni–Al–Me(Co,Cr) β-alloys, are discussed. The crystallographic structural analysis of the L10 → Ni5Al3 transformation and Ni2Al structure is performed.