Microstructures and mechanical properties of multiprincipal component CoCrFeNiTix alloys

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 556; pp. 170 - 174
• Main Authors: Shun, Tao-Tsung, Chang, Liang-Yi, Shiu, Ming-Hua
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 30.10.2012; Elsevier
• Subjects: Applied sciences; Compressive strength; Cross-disciplinary physics: materials science; rheology; Elasticity. Plasticity; Exact sciences and technology; Fracture strain; Fractures; Hardness; High-entropy alloy; Materials science; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Microstructure; Physics; Solid solution, precipitation, and dispersion hardening; aging; Treatment of materials and its effects on microstructure and properties; Compressive strength; Fracture strain; Microstructure; Hardness; High-entropy alloy; Sigma phase; Quaternary alloys; Cubic lattices; Solid solution strengthening; Ductility; Elasticity; Fracture; Titanium addition; Solid solution; Structure composition relationship; Elastic properties; high entropy alloy; Intermetallic compound; Rupture; Mechanical properties; Laves phase; Yield strength; Secondary hardening; Yield stress; Crystalline structure
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2012.06.075

The purpose of this study is to investigate the effects of Ti addition on the microstructures and mechanical properties of multiprincipal component CoCrFeNiTix (x values in molar ratio, x=0, 0.3, and 0.5) alloys. The CoCrFeNi quaternary alloy displayed a crystalline structure constructed by a simple face-centered cubic solid solution, whereas a plate-like structure consisting of a mixture of (Ni, Ti)-rich R phase and (Cr, Fe)-rich σ phase was observed within the face-centered cubic matrix of a CoCrFeNiTi0.3 alloy. In a CoCrFeNiTi0.5 alloy, an face-centered cubic matrix, a (Ti, Co)-rich Laves phase, and R+σ mixed phases were discovered. The compressive strength of the alloys rose by approximately 75% after the addition of Ti. Alloys with high levels of Ti content had high yield stress values and low ductility values. The solid-solution strengthening of the face-centered cubic matrix and the secondary-phase hardening were the two main factors that strengthened the alloy. The CoCrFeNiTi0.3 alloy exhibited a compressive strength of 1529MPa and a fracture strain of 0.60; this indicates that this material shows potential for the development of a ductile, high-strength alloy.