Wear and mechanical properties of novel (CuCrFeTiZn)100-xPbx high entropy alloy composite via mechanical alloying and spark plasma sintering

Yadav, Surekha; Sarkar, Suman; Aggarwal, Akash; Kumar, Arvind; Biswas, Krishanu

doi:10.1016/j.wear.2018.05.023

Cited by 48 publications

(17 citation statements)

References 42 publications

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“…The fracture toughness of a material depends on the various parameters, such as: volume fraction, size, shape and properties of phases, grain boundaries, pores and etc. [95]. It is seen that three main factors affect the fracture toughness values in the present study.…”

Section: Resultsmentioning

confidence: 48%

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The effect of lanthanum addition on the microstructure and mechanical properties of Mg-modified hydroxyapatite ceramics

Pazarlıoğlu

Algan

Isikogullari

et al. 2021

PAC

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In the present paper, the effect of La2O3 (0.25, 0.5 and 1 wt.%) addition on the phase stability, porosity, density, hardness, fracture toughness, compressive strength and brittleness index of hydroxyapatite modified with 1 wt.% of MgO was investigated. Hydroxyapatite (HA) without additives sintered at 1300?C has mixture of dominant hydroxyapatite phase with beta-tricalcium phosphate (?-TCP), alpha-tricalcium phosphate (?-TCP) and calcium oxide (CaO) phases. The microstructure is characterized with transgranular microcracks and oversized grains. Although the density and hardness of the pure HA increased with increasing temperature, a steady decrease in fracture toughness (from 0.96 to 0.71MPa?m1/2) and compressive strength (from 130.2 to 65.6MPa) was observed. For the HA modified with 1 wt.% of MgO the highest compressive strength (183.2MPa) and fracture toughness (1.47MPa?m1/2) were obtained at 1200?C and at this temperature the brittleness index was 3.24 ?m-1/2. Increase in the sintering temperature led to the increase of the brittleness index of the pure HA,MgO modified HA and La2O3-MgO modified HA samples. The addition of 1 wt.%La2O3 to 1 wt.% MgO-HA contributed to the increase in the compressive strength of about 10%(from 183.2 to 202.0MPa), fracture toughness of about 69% (from 1.37 to 2.32MPa?m1/2) and also decrease of the brittleness index from 3.24 to 2.18 ?m-1/2. The best performance after sintering at 1300?C was obtained for the MgO-HA sample with 0.25wt.% La2O3. As a result of this study, a new candidate material for biomedical application with superior mechanical properties and the phases that do not cause adverse reactions in the human body could be 1 wt.% MgO-HA modified with 1 wt.% La2O3 and sintered at 1200?C.

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Section: Resultsmentioning

confidence: 48%

“…It has become usable in the human body by adding 1 wt.% La 2 O 3 . The fracture toughness of a material depends on the various parameters, such as: volume fraction, size, shape and properties of phases, grain boundaries, pores and etc [95]…”

mentioning

confidence: 99%

The effect of lanthanum addition on the microstructure and mechanical properties of Mg-modified hydroxyapatite ceramics

Pazarlıoğlu

Algan

Isikogullari

et al. 2021

PAC

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“…The addition of carbon and Cr 3 C 2 both increased the hardness but consequently reduced the ductility of the part and, at some ratios, was ill-advised due to excessive brittleness [ 29 , 30 ]. The addition of some elements has seemingly no effect on material properties, as is the case of Pb [ 31 ]. The balancing of positive and negative effects of elements is necessary for developing and modifying new HEAs for specific conditions, and choices must be purposefully made.…”

Section: Design Of Heasmentioning

confidence: 99%

Tribological Properties of High-Entropy Alloys under Dry Conditions for a Wide Temperature Range—A Review

2021

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High-entropy alloys (HEAs) are composed of multiple elements with equimolar or near equimolar composition that have superior mechanical and tribological properties. In this article, we present a review on the tribological performance of HEAs. The tribological properties of different HEAs systems have been evaluated, and it has been found that the wear rate strongly depends on the crystal structure of the phases. The most common structures are face-centered cubic (FCC), body-centered cubic (BCC), and dual-phase (FCC + BCC) alloys due to the high entropy of mixing instead of forming intermetallic phases. In general, HEAs with a BCC structure showed superior hardness and wear properties compared to FCC and FCC + BCC alloys. The lesser wear rate of HEAs with a BCC structure is attributed to the reductions in ductility, resulting in strong but brittle alloys. In addition to the crystal structure, the effect of temperature on the tribological performance of the HEAs is also discussed, which highlights their potential applications for high temperatures. Moreover, various other factors such as grain size, formation of an oxide layer, and wear mechanisms are discussed.

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“…In terms of their application in friction contacts, the influence of their exact composition [16], different lubricants [17] and manufacturing routes (e.g., casting [18], laser cladding [19] or spark plasma sintering [20]) was studied. The self-lubrication properties of HEAs were tested by adding graphite, MoS 2 , silver powder or soft dispersoids [21,22].…”

Section: Introductionmentioning

confidence: 99%

Microstructural changes in CoCrFeMnNi under mild tribological load

et al. 2020

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The lack of a principle element in high-entropy alloys (HEA) leads to unique and unexpected material properties. Tribological loading of metallic materials often results in deformed subsurface layers. As the microstructure feedbacks with friction forces, the microstructural evolution is highly dynamic and complex. The concept of HEAs promises high solid solution strengthening, which might decrease these microstructural changes. Here, we experimentally investigated the deformation behavior of CoCrFeMnNi in a dry, reciprocating tribological contact under a mild normal load. After only a single stroke, a surprisingly thick subsurface deformation layer was observed. This layer is characterized by nanocrystalline grains, twins and bands of localized dislocation motion. Twinning was found to be decisive for the overall thickness of this layer, and twin formation within the stress field of the moving sphere is analyzed. The localization of dislocation activity, caused by planar slip, results in a grain rotation. Fragmentation of twins and dislocation rearrangement lead to a nanocrystalline layer underneath the worn surface. In addition, oxide-rich layers were found after several sliding cycles. These oxides intermix with the nanocrystalline layer due to material transfer to the counter body and re-deposition to the wear track. Having revealed these fundamental mechanisms, the evolution of such deformation layers in CoCrFeMnNi under a tribological load might lead to other HEAs with compositions and properties specifically tailored to tribological applications in the future.

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Wear and mechanical properties of novel (CuCrFeTiZn)100-xPbx high entropy alloy composite via mechanical alloying and spark plasma sintering

Cited by 48 publications

References 42 publications

The effect of lanthanum addition on the microstructure and mechanical properties of Mg-modified hydroxyapatite ceramics

The effect of lanthanum addition on the microstructure and mechanical properties of Mg-modified hydroxyapatite ceramics

Tribological Properties of High-Entropy Alloys under Dry Conditions for a Wide Temperature Range—A Review

Microstructural changes in CoCrFeMnNi under mild tribological load

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