Microstructure and Corrosion Performance of Aluminium Matrix Composites Reinforced with Refractory High-Entropy Alloy Particulates

Abstract

Novel aluminium matrix composites reinforced by MoTaNbVW refractory high-entropy alloy (HEA) particulates have been fabricated by powder metallurgy. The microstructure of the produced composites has been studied and the corrosion behaviour assessed in 3.5% NaCl solution. The composites exhibited low porosity, good homogeneity, few defects, and good distribution of the reinforcing phase in the Al matrix. No secondary intermetallic phases have been formed while the interface between matrix/reinforcement showed good bonding with no signs of reactivity. Increasing the volume of the reinforcing phase leads to increased hardness values. Al-HEA composites exhibited susceptibility to localised forms of corrosion in 3.5% NaCl solution. The microstructure has been analysed and corrosion mechanisms have been formulated.

Nanoscale Tribological Properties of Nanostructure Fe3Al and (Fe,Ti)3Al Compounds Fabricated by Spark Plasma Sintering Method

“…In this test, the residual depth is an appropriate criterion for evaluating the wear resistance of the material. This test is frequently used to compare the wear resistance of various materials processed in different conditions [55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73]. The AFM images from longitudinal scratches of the bulk As can be seen, the residual depth of the Fe 3 Al compound is larger than that of the (Fe,Ti) 3 Al sample.…”

Development and Research of New Hybrid Composites in Order to Increase Reliability and Durability of Structural Elements

“…In order to improve the functional and mechanical properties of the composites AlCoCrCuFeNi-cBNCoMo and AlCoCrCuFeNi-B4CCoMo, we implemented high-energy machining of powder mixtures in a water-cooled centrifugal ball mill GEFEST-2 (AGO-2U). The ball mill has the following parameters: drum volume-150 cm 3 ; ball acceleration-40 g ball ratio for loading (10)(11)(12)(13)(14)(15):1; ball diameter-6 mm; ball material-WC; carrier speed-890 rpm; and drum speed-1000 rpm. We carried out high-energy machining in an inert environment (argon).…”

“…The experimental data were processed using the Statistica v10.0 application package in the SPSS environment. The analysis of the results obtained shows (Figure 7a) that material Hastelloy X (NiCrFeMo) (I = 46.16 × 10 −6 g/m, disk pressure P = 9.4 MPa) has the highest wear rate (Figure 7a The wear rate (I) from the pressure (P) of the disk changes according to polynomial dependence (Figure 6a) and is described by empirical Equations ( 7)- (10). The equations were obtained from the mathematical analysis of experimental data using Statistica v10.0 software: AlCoCrCuFeNi-B4CCoMo: I = −8.77…”

“…High-entropy materials and ceramic wear-resistant materials as surface layers [3][4][5][6][7][8][9][10][11][12][13] or as part of surface composites [14][15][16][17][18][19][20] ensure an effective response to external factors and adaptation to external influences. High-energy technologies provide nanostructuring.…”

Evolution of Microstructure and Mechanical Properties of LM25–HEA Composite Processed through Stir Casting with a Bottom Pouring System

“…Chen et al [ 14 ] considered the powder metallurgy route to fabricate a copper matrix composite with AlCoNiCrFe as the reinforcement phase and found that the yield strength of composites was enhanced by approximately 160% compared with the yield of the Cu matrix, and the elongation increased by approximately 15%. Ananiadis et al [ 15 ] studied the microstructure and corrosion performance of Al matrix composites reinforced with refractory (MoTaNbVW) HEA particulates. The composite was fabricated through the powder metallurgy route, and it was reported that increasing the volume of the reinforcing phase enhanced the composite’s hardness.…”