Achieving low wear in a μ-phase reinforced high-entropy alloy and associated subsurface microstructure evolution

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

“…4 E 1 ) indicate that higher-order multiple DTs with polarity are activated. Nano-scale twin boundaries (TBs) refine the microstructure into an alternating laminar twin-matrix structure by providing high-angle GBs in the parent grains [ 13 ]. Thus, the significant grain refinement in the NC tribo-layer benefits from the interaction of dislocations and nano-scale DTs during plastic deformation.…”

“…Nanograins possess very limited strain hardening ability so that plastic incompatibility and strain localization occur during surface folding and cracking, which result in wear particles, invariably evoking a dramatic micro-cutting and three-body abrasion [ 1 , 11 ]. Experimental results in recent years give an illuminating picture about the wear resistance of the alloys that can be elevated when introducing heterogeneous structural evolutions to accommodate strain gradients along the friction interface, e.g., by introducing nanocomposite/amorphous tribo-layers [ 2 , 12 ], precipitation-reinforced interfaces [ 3 , 13 ], gradient nanograined subsurfaces [ 1 , 4 ], friction-induced nano-twins [ 14 , 15 ], crystallographic textures [ 16 ], and self-organized lubricating tribo-layers [ 10 , 17 ]. In particular, recent studies on the wear response of complex concentrated alloys (CCAs) have advanced the understanding of wear-driven friction interface protection.…”

High Hardness and Wear Resistance in AlCrFeNiV High-Entropy Alloy Induced by Dual-Phase Body-Centered Cubic Coupling Effects

“…The energy consumed by the friction system mainly exists in the form of wear, material deformation and friction heat [ 36 , 37 ]. Therefore, the influence of load on wear performance is analyzed from the following several aspects.…”

“…As a result, contact surface damage is more severe, resulting in increased wear rates. The maximum Hertz contact stress σ max of planar and spherical contact can be calculated as follows [ 35 , 36 , 37 ], taking alumina as an example: where R = 2.5 mm is the radius of Al 2 O 3 ball, E 1 = 340 GPa and E 2 = 228 GPa represent the elastic modulus of the Al 2 O 3 ball and AlCrFeNiV HEA disk, respectively, υ 1 = 0.22 is the Poisson’s ratio of the alumina ball and υ 2 = 0.3 is chosen for the HEA disk. When the normal load P is 10 N, the corresponding Hertzian contact stress of HEA was calculated to be 1887 MPa.…”

Synergetic Enhancements on the Mechanical and Tribological Performance of Al10Cr17Fe20NiV4 Medium‐Entropy Alloys Induced by Nano‐Al2O3 Particles

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In a wide range of medium-entropy alloys (MEA, the mixing entropy of the alloy between 1 R and 1.5 R) and high-entropy alloys (HEA, the mixing entropy of the alloy exceeds 1.5 R), the multiprincipal elements HEA and MEA of the face-centered cubic (FCC) structure have attracted extensive attention ascribable to its prominent mechanical properties, [1] outstanding cryogenic property, [2] and wear resistance. [3] However, the mechanical properties of these FCC alloys are still deficient and there is still much room for improvement. To improve the mechanical performance of MEA, various strengthening mechanisms such as element precipitation [4,5] and the in situ formation of the second phase [6][7][8][9][10] have been studied in depth.HEAs, which were proposed by Yeh et al [11] and Cantor et al, [12] first, have been paid much attention to and extensively studied by researchers in recent decades.

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