New refractory high entropy alloys

International Conference on Innovative Research - ICIR EUROINVENT 2019

Voiculescu, I.^1 ; Geant, V.^1 ; Stefnoiu, R.^1 ; Rotariu, A.^2 ; Scutelnicu, E.^3 ; Pantilimon, M.C.^1 ; Mitric, D.^4 ; Crciun, V.^5

Politehnica University of Bucharest, 313 Splaiul Independenei, Bucharest

060042, Romania^1

Military Technical Academy, 39-49 George Cobuc Boulevard, Bucharest

05014, Romania^2

Dunrea de Jos University of Galai, 111 Domneasc street, Galai

800201, Romania^3

National Research and Development Institute for Non-Ferrous and Rare Metals, 102 Biruinei Boulevard, Pantelimon

077145, Romania^4

National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, Mgurele

077125, Romania^5

关键词: Chemical compositions;    Hardness and corrosion;    High compressions;    Microstructural stability;    Microstructure and mechanical properties;    Minimum value;    Thermal engines;    Vacuum arc remelting;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/572/1/012024/pdf
DOI  :  10.1088/1757-899X/572/1/012024

来源: IOP

【 摘 要 】

The paper presents researches on the microstructure and mechanical properties of a new types of refractory high entropy alloys, which can be used for thermal engine components as well as for military incendiary bullet. The main characteristics required for such applications are high compression resistance, microstructural stability during thermal stress, hardness and corrosion resistance. To obtain such specific characteristics, the raw materials must be melted in inert protective atmosphere, and then heat treated for the homogenization of the microstructure and chemical composition. In the paper, there have been studied three types of high entropy alloys, HfMoNiTaW, 2HfMoNi2Ta and MoNiTaW obtained in the vacuum arc remelting (VAR) equipment. The heat treatment, performed at 800 °C with a holding time of 4 hours, allows obtaining a good homogenization of the chemical composition while generating a decrease in the microhardness, from a maximum value of 637 HV0.2 to a minimum value of 527HV0.2.