Reciprocating sliding wear behavior of high-strength nanocrystalline Al 84 Ni 7 Gd 6 Co 3 alloys

Wang, Zhi; Georgarakis, K.; Zhang, W. W.; Prashanth, K.G.; Eckert, J.; Scudino, Sergio

doi:10.1016/j.wear.2017.04.013

Cited by 14 publications

(6 citation statements)

References 33 publications

(44 reference statements)

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“…Higher cooling rate results in a more refined dendritic structure, resulting in a smoother surface. Finer microstructures offer improved hardness, which in turn offer higher wear resistance [65][66][67]. It may be observed that in general, the wear resistance of the HPSC decreases with increasing load and/temperature combination due to accelerated conditions (which is as expected).…”

Section: Wear Behaviorsupporting

confidence: 57%

Mechanical and Tribological Behavior of Gravity and Squeeze Cast Novel Al-Si Alloy

Chandra

Krishna

Ravi

et al. 2022

Metals

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The automotive industry traditionally reduces weight primarily by value engineering and thickness optimization. However, both of these strategies have reached their limits. A 6% reduction in automotive truck mass results in a 13% improvement in freight mass. Aluminum alloys have lower weight, relatively high specific strength, and good corrosion resistance. Therefore, the present manuscript involves manufacturing Al-based alloy by squeeze casting. The effect of applied pressure during the squeeze cast and gravity cast of a novel Al-Si alloy on microstructural evolution, and mechanical and wear behavior was investigated. The results demonstrated that squeeze casting of the novel Al-Si alloy at high-pressure exhibits superior mechanical properties and enhanced wear resistance in comparison to the gravity die-cast (GDC) counterpart. Squeeze casting of this alloy, at high pressure, yields fine dendrites and reduced dendritic arm spacing, resulting in grain refinement. The finer dendrites and reduced dendritic arm spacing in high-pressure squeeze cast alloy than in the GDC alloy were due to enhanced cooling rates observed during the solidification process, as well as the applied squeeze pressure breaks the initial dendrites that started growing during the solidification process. Reduced casting defects in the high-pressure squeeze cast alloy led to a reduced coefficient of friction, resulting in improved wear resistance even at higher loads and higher operating temperatures. Our results demonstrated that squeeze casting of the novel Al-Si alloy at high-pressure exhibits a 47% increase in tensile strength, 33% increase in hardness, 10% reduction in coefficient of friction, and 15% reduction in wear loss compared to the GDC counterpart.

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Section: Wear Behaviorsupporting

confidence: 57%

Mechanical and Tribological Behavior of Gravity and Squeeze Cast Novel Al-Si Alloy

Chandra

Krishna

Ravi

et al. 2022

Metals

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“…Summary of tribological properties of typical materials. The plot includes parameters for typical classes of materials that are developed for improved tribological properties, such as coarse‐grained metals (CGMs), [ 14–17,23,75–81 ] nanocrystalline (NC) metals, [ 15,16,22–24,74,78,82,83 ] metallic glasses (MGs), [ 17,30,74,79–81,84–89 ] MoS 2 , [ 90 ] and diamond‐like carbon (DLC). [ 73,10,91–93 ] …”

Section: Resultsmentioning

confidence: 99%

“…Summary of tribological properties of typical materials. The plot includes parameters for typical classes of materials that are developed for improved tribological properties, such as coarse-grained metals (CGMs), [14][15][16][17]23,[75][76][77][78][79][80][81] nanocrystalline (NC) metals, [15,16,[22][23][24]74,78,82,83] metallic glasses (MGs), [17,30,74,[79][80][81][84][85][86][87][88][89] MoS 2 , [90] and diamond-like carbon (DLC). [73,10,[91][92][93] above, tribological properties of metals are not solely determined by hardness and strength but also enormously influenced by both plasticity and crack resistance that can be modified by chemical and structural variables.…”

Section: Tribological Properties Of Selected Alloysmentioning

confidence: 99%

Achieving Diamond‐Like Wear in Ta‐Rich Metallic Glasses

et al. 2023

Advanced Science

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Most metals and alloys suffer from high friction and wear due to their low hardness and lack of self-lubrication. Although plenty of strategies have been proposed, it is still a long-standing challenge to achieve diamond-like wear in metals. Metallic glasses (MGs) are supposed to possess low coefficient of friction (COF) because of their high hardness and fast surface mobility. However, their wear rate is larger than that of diamond-like materials. Here, this work reports the discovery of Ta-rich MGs that exhibit diamond-like wear. This work develops an indentation approach for high-throughput characterization of crack resistance. By employing deep indentation loading, this work is able to efficiently identify the alloys that exhibit better plasticity and crack resistance according to the differences of indent morphology. With high temperature stability, high hardness, improved plasticity, and crack resistance, the discovered Ta-based MGs exhibit diamond-like tribological properties, featured by COF as low as ≈0.05 for diamond ball test and ≈0.15 for steel ball test, and specific wear rate of only ≈10 −7 mm 3 N −1 m −1 . The discovery approach and the discovered MGs exemplifie the promise to substantially reduce friction and wear of metals and may unleash the potential of MGs in tribological applications.

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“…Besides, the generated abrasive particles would give rise to deep plowing groove in the worn track along the sliding direction which was ascribed to the abrasive wear. In addition, micro-cracks are formed on the worn surface due to the embedded debris on the smoothed areas which will give rise to wear by spalling [38]. The EDS results (Table 3) of area I in Figure 4(b) illustrates that the oxygen content in the worn surface of the original specimen is higher, which means that the low strength and high toughness oxygenic tribo-layers are formed on the worn surface [21].…”

Section: Resultsmentioning

confidence: 99%

High temperature wear performance of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy subjected to laser shock peening

Ren

Tong

Zhou

et al. 2018

Materials Science and Technology

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This paper investigates the influence of laser shock peening (LSP) parameters on surface integrities and high temperature wear performances of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy. Surface integrities include surface roughness, residual stress and micro-hardness are measured. High temperature wear performance of TC11 alloy with and without LSP are investigated. The results indicate that multiple LSP impacts can improve surface micro-hardness and induce compressive residual stress in the surface layer. Moreover, the friction coefficient and wear rate of TC11 alloy significantly decrease after LSP with optimised parameters. The improved wear performance is ascribed to the low surface roughness, higher surface micro-hardness and compressive residual stress induced by multiple LSP impacts in the surface layer.

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Reciprocating sliding wear behavior of high-strength nanocrystalline Al 84 Ni 7 Gd 6 Co 3 alloys

Cited by 14 publications

References 33 publications

Mechanical and Tribological Behavior of Gravity and Squeeze Cast Novel Al-Si Alloy

Mechanical and Tribological Behavior of Gravity and Squeeze Cast Novel Al-Si Alloy

Achieving Diamond‐Like Wear in Ta‐Rich Metallic Glasses

High temperature wear performance of Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy subjected to laser shock peening

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