Application of Pettifor and Pugh Criteria in Analysis of Plasticity and Brittleness of TiNi–TiFe Alloys with and without Shape Memory Effect
С. А. Муслов, S. D. Arutyunov
Abstract
Abstract This article describes calculations of Cauchy pressure pC of the crystalline lattice of alloys (Pettifor criterion), the Pugh ratio (Pugh criterion), and the Poisson ratio (Frantsevich criterion) characterizing plasticity and brittleness of materials. Plasticity of alloys on the basis of titanium nickelide TiNi and brittleness of Ti50Ni50 – xFex (x ≥ 10%) compounds are discussed using the criteria as well as the association of mechanical properties of alloys with the type of chemical bonds between atoms. The coefficient of correlation of TiNi and TiNi–TiFe between the Cauchy pressure pC and the Pugh ratio B/G (cij) is 96.76% (p < 0.001), between pC and B/G (A) is 85.46% (p < 0.05), and between pC and μ is 98.87% (p < 0.001), which signifies a strong statistical correlation between the parameters.