Dry sliding wear behavior of laser clad TiVCrAlSi high entropy alloy coatings on Ti–6Al–4V substrate

Huang, Chen Hung; Zhang, Yongzhong; Vilar, R.; Shen, Jianyun

doi:10.1016/j.matdes.2012.04.049

Cited by 243 publications

(93 citation statements)

References 24 publications

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“…Recently, this aspect of material research has expanded past that of the conventional alloy (consisting of 1 or 2 principle components) into a new class of highly alloyed materials, high-entropy alloys (HEAs). This field has gained attention [5][6][7] due to findings of higher strengths [8,9], ductility [10] and other interesting properties [11] pertaining to this class. Efforts to design, characterise and utilise HEAs are currently underway globally.…”

Section: Introductionmentioning

confidence: 99%

Predicting the formation and stability of single phase high-entropy alloys

King

Middleburgh

McGregor³

et al. 2016

Acta Materialia

302

120

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Abstract:A method for rapidly predicting the formation and stability of undiscovered single phase high-entropy alloys (SPHEAs) is provided. Our software implementation of the algorithm uses data for 73 metallic elements and rapidly combines them -4, 5 or 6 elements at a time -using the Miedema semi-empirical methodology to yield estimates of formation enthalpy. Approximately 186,000,000 compositions of 4, 5 and 6 element alloys were screened, and ~1,900 new equimolar SPHEAs predicted. Of the 185 experimentally reported HEA systems currently known, the model correctly predicted the stability of the SPHEA structure in 177. The other sixteen were suggested to actually form a partially ordered solid solution -a finding supported by other recent experimental and theoretical work. The stability of each alloy at a specific temperature can also be predicted, allowing precipitation temperatures (and the likely precipitate) to be forecast. This combinatorial algorithm is described in detail, and its software implementation is freely accessible through a webservice allowing rapid advances in the design, development and discovery of new technologically important alloys. , and re-iterated by others since then [1,12], defines a HEA as any alloy consisting of 5 or more elements between 5 -35 at. %. As such, this type of HEA will usually possess a microstructure consisting of two or more distinct phases, some of which are likely to be brittle intermetallic compounds. Although, multiphase strengthening is sometimes desirable in alloys, a large amount of any brittle phase will generally make an alloy unusable as a structural material and such HEAs are therefore mundane. However, as will be discussed shortly, in a few special cases, the additional entropy of the multi-element composition will stabilise a microstructure consisting of either (i) a single solid solution having one of the simple close-packed crystal structures (FCC, HCP or BCC) or (ii) a duplex microstructure consisting of two such simple solid solutions. Generally, it is these non-trivial examples of HEA that interest investigators.This is because the resulting random solid solution(s) will exhibit a combination of ductility coupled with significant solid solution hardening. We recommend use of the term single 2 phase high-entropy alloy (SPHEA) as a more restrictive term to differentiate the rare and desirable single phase type of HEA from generic examples of multiphase HEAs.Combining Yeh's compositional limits [7] with the requirement for a single phase solid solution, we can define a SPHEA as an alloy with  4 alloying elements, at least 4 of which with a molar ratio between 0.33 -1 to that of the highest contributing element. These alloys must be able to display a single phase of simple, random, close-packed structure below the solidus.We return now to the factors that might stabilise a SPHEA. The prevailing hypotheses were (i) that the simple crystal structure or structures are thermodynamically stabilised, relative to possible intermetallic compounds, by the inc...

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Section: Introductionmentioning

confidence: 99%

Predicting the formation and stability of single phase high-entropy alloys

King

Middleburgh

McGregor³

et al. 2016

Acta Materialia

302

120

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“…In addition, the binary Al-V, Al-Cr and Al-Ti phase diagrams show the considerably high solubility of Al in V, Cr, and Ti. According to literature 18) , the additions of V and Mo in the TiZr0.5NbCr0.5V and TiZr0.5NbCr0. 5Mo alloys re ne dendrites.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Anticorrosion Property of High-Entropy Alloy AlFeNiCrCoTi0.5Vx

2016

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The in uence of vanadium element on the microstructure, microhardness, and electrochemical corrosion resistance properties of as-cast AlFeNiCrCoTi 0.5 V x (x = 0, 0.5, 1, 1.5, 2) was studied. The microstructures of the alloys with V contents lower than 1.0 are mainly comprised of the simple body-centered cubic (BCC) and face-centered cubic (FCC) composite structures. With V mole ratio increased to 1.5, the FCC structure plays the leading role in the alloys, which enhances the plasticity and toughness of the alloys. The microhardness of the alloys increased with the increasing of V content in the alloys. Cr, Ni, Ti, and Al elements in the alloys facilitate passivation in 3.5 M NaCl solution. V element mainly enriched in interdendritic region of the alloys, which altering the distribution of Cr and Ti. Cr and Ti is bene t to the passivation, which enlarges the corrosion potential of the alloys and lowers the passive current. Consequently, the alloys present a protective effect in 3.5 M NaCl solution.

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“…These favorable advantages have made the laser-cladding alloy attractive among surface modification technologies. Huang et al [10] prepared TiVCrAlSi HEA coatings on Ti-6Al-4V substrate by laser cladding and investigated the dry sliding wear behavior. The combination of the hard (Ti,V) 5 Si 3 phase and relatively ductile and tough BCC matrix improved the sliding wear resistance.…”

Section: Introductionmentioning

confidence: 99%

Slurry Erosion Behavior of AlxCoCrFeNiTi0.5 High-Entropy Alloy Coatings Fabricated by Laser Cladding

Zhao

et al. 2018

Metals

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High-entropy alloys (HEAs) have gained extensive attention due to their excellent properties and the related scientific value in the last decade. In this work, Al x CoCrFeNiTi 0.5 HEA coatings (x: molar ratio, x = 1.0, 1.5, 2.0, and 2.5) were fabricated on Q345 steel substrate by laser-cladding process to develop a practical protection technology for fluid machines. The effect of Al content on their phase evolution, microstructure, and slurry erosion performance of the HEA coatings was studied. The Al x CoCrFeNiTi 0.5 HEA coatings are composed of simple face-centered cubic (FCC), body-centered cubic (BCC) and their mixture phase. Slurry erosion tests were conducted on the HEA coatings with a constant velocity of 10.08 m/s and 16-40 meshs and particles at impingement angles of 15, 30, 45, 60 and 90 degrees. The effect of three parameters, namely impingement angle, sand concentration and erosion time, on the slurry erosion behavior of Al x CoCrFeNiTi 0.5 HEA coatings was investigated. Experimental results show AlCoCrFeNiTi 0.5 HEA coating follows a ductile erosion mode and a mixed mode (neither ductile nor brittle) for Al 1.5 CoCrFeNiTi 0.5 HEA coating, while Al 2.0 CoCrFeNiTi 0.5 and Al 2.5 CoCrFeNiTi 0.5 HEA coatings mainly exhibit brittle erosion mode. AlCoCrFeNiTi 0.5 HEA coating has good erosion resistance at all investigated impingement angles due to its high hardness, good plasticity, and low stacking fault energy (SFE).

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Dry sliding wear behavior of laser clad TiVCrAlSi high entropy alloy coatings on Ti–6Al–4V substrate

Cited by 243 publications

References 24 publications

Predicting the formation and stability of single phase high-entropy alloys

Predicting the formation and stability of single phase high-entropy alloys

Microstructure and Anticorrosion Property of High-Entropy Alloy AlFeNiCrCoTi<sub>0.5</sub>V<sub><i>x</i></sub>

Slurry Erosion Behavior of AlxCoCrFeNiTi0.5 High-Entropy Alloy Coatings Fabricated by Laser Cladding

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