Microstructures and mechanical properties of multiprincipal component CoCrFeNiTix alloys

作者：Shun Tao Tsung^*; Chang Liang Yi; Shiu Ming Hua

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2012, 556: 170-174.

DOI：10.1016/j.msea.2012.06.075

• High-entropy alloy
• Microstructure
• Hardness
• Compressive strength
• Fracture strain

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 sigma 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+sigma 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 1529 MPa and a fracture strain of 0.60; this indicates that this material shows potential for the development of a ductile, high-strength alloy.

• 出版日期2012-10-30