مقاله انگلیسی رایگان در مورد آلیاژ آنتروپی بالای CoCrFeNiMn تقویت شده از طریق پخش اکسید – الزویر 2017

Abstract

The CoCrFeNiMn high entropy alloy and its strengthened version by in-situ formed dispersion of yttria nano-oxides prepared via mechanical alloying were investigated. The grain refinement of the one phase FCC alloy by presence of oxides was determined by microstructural analyses to be 50%. The positive effect of oxide dispersion on the strength properties was found to be between 30% and 70% for room and elevated temperatures, respectively. The resulting creep strain rates for the strengthened alloy were significantly lower, i.e., three orders for 30 MPa stress level, comparing the initial one, therefore, the pining mechanism was among others very effective.

Introduction

The concept of high-entropy alloys (HEA) based on multiple principal elements in roughly equal proportions was suggested by Cantor and Yeh [1, 2] in 2004. The main principle of the concept can be pointed in overcoming enthalpies of compounds formation and phase Downloaded from http://iranpaper.ir http://www.itrans24.com/landing1.html separation by increased configuration entropy when the number of alloying elements increases [3]. Many researchers have been excited in exploring this new and wide material group; at least 30 elements have been used to prepare more than 300 recently reported HEAs [2, 4, 5].