Effects of Ge addition on the structure, mechanical and magnetic properties of (CoCrFeNi)_100-xGe_x high-entropy alloys

Abstract

Alloying non-metallic elements can not only change the structure of alloys, but also tailor the mechanical and physical properties. The microstructure, mechanical and magnetic properties of (CoCrFeNi)100-xGex (molar ratio, x = 0 ~ 33) high-entropy alloys (HEAs) have been systematically studied in this paper. The experiment results show that the (CoCrFeNi)100-xGex HEAs transform from a face-centered cubic (FCC) to a body-centered cubic (BCC) solid solution when 10 ≤ x ≤ 25, and a hexagonal intermetallic compound (IM) formed at x = 33. Tensile measurement revealed that the strength and plasticity of the alloy were enhanced simultaneously with Ge addition in the single FCC region (x ≤ 10), a decrease in ductility but sharp increase of strength was found in the alloys when the BCC phase starts to appear. Theoretical calculations and magnetic hysteresis loop measurements show that the alloys transform gradually from a paramagnetic to a ferromagnetic state at room temperature.

Short-range-order degree dominated physical and mechanical properties of refractory multi-principal element alloys: a first-principles study

“…The refractory multi-principal element alloys (RMPEAs) have many advantages over traditional alloys [1], such as high strength and stability at high temperatures [2][3][4][5][6], which can be utilized to gas turbine engines in the aerospace industry [7][8][9][10][11]. In the past years, multi-principal element alloys (MPEAs) are traditionally assumed to be random solid solutions [12].…”

Microstructural Evolution and Magnetic and Corrosion Properties of FeCoNiAl0.2Yx High-Entropy Alloys

“…3 The special structure of HEAs with its excellent comprehensive properties, such as high hardness, excellent magnetic properties, outstanding oxidation resistance, superior corrosion resistance, and excellent wear resistance has a broad application prospect. [4][5][6][7][8] Although traditional soft magnetic alloys have excellent magnetic properties, there are some problems such as low strength and poor corrosion resistance. Studies have shown that HEAs are an ideal soft magnetic material with excellent soft magnetic properties and excellent mechanical properties.…”