As-Cast Microstructures of High Entropy Alloys Designed to Be TaC-Strengthened  

作　　者：Patrice Berthod 

机构地区：[1]Faculty of Sciences and Technologies,University of Lorraine,Vandoeuvre-lès-Nancy,54500,France [2]Institut Jean Lamour,CNRS,Nancy,54000,France

出　　处：《Journal of Metallic Material Research》2022年第2期1-10,共10页金属材料研究（英文）

摘　　要：In this work two new alloys were obtained by extrapolation from a well-known high entropy alloy,the equimolar CoNiFeMnCr one.This was done by the addition of carbon and of tantalum,Ta being one of the strongest MC-former elements.They were produced by conventional casting under inert atmosphere.The obtained microstructures were characterized by X-ray diffraction,metallography,electron microscopy,and energy dispersion spectrometry.Their hardness was also measured by hardness indentation.In parallel,the original CoNiFeMnCr alloy was also synthesized and characterized for comparison.The reference HEA alloy is single-phased with an austenitic structure,while the two{Ta,C}-added alloys are double-phased,with an austenitic matrix and interdendritic script-like TaC carbides.The matrixes of these HEA/TaC alloy are equivalent to an equimolar CoNiFeMnCr alloy to which 2 wt.%Ta is present in solid solution.The presence of the TaC carbides caused a significant increase in hardness which suggests that the HEA/TaC alloys may be mechanically stronger than the HEA reference alloy at high temperature.

关 键 词：HEA alloys TaC carbides As-cast microstructures HARDNESS 

分 类 号：TG1[金属学及工艺—金属学]