Structure and properties of high-entropy TiCrFeNiGa alloy

A high-entropy Ti–Cr–Fe–Ni–Ga alloy with a near to equiatomic ratio of components was obtained from a mechanical mixture of Ti, Ni, Cr and ferrogallium pow¬ders by the electric arc melting method. According to the results of the X-ray phase analysis of the obtained alloy, it was established that it consists of two solid substitution solutions. The first is formed on the basis of chromium and iron (β1-BCC1), the second – on the basis of iron and all other elements (β2-BCC2). The mass content of the β1 phase is within  40%, and of the β2 phase –  60%. The Rockwell hardness of the alloy is  44 HRC. The main physi¬co¬mechanical properties of materials were determined by the method of automatic instru¬mental microindentation. It is shown that the characteris¬tics of the hardness HM (and, accordingly, the value of yield strength σS calcu¬lated from Teibor’s relation) and Young’s modulus are at a fairly high level (HM = 9.71 GPa, E = 254.7 GPa, σS = 3.24 GPa), however, the alloy is characterized by a low level of plasticity.