Microstructural characterization of medium entropy alloy thin films

Chawake, Niraj; Zálešák, Jakub; Gammer, Christoph; Franz, Robert; Cordill, Megan J.; Kim, Jeong Tae; Eckert, J.

doi:10.1016/j.scriptamat.2019.10.001

Cited by 31 publications

(16 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The phase diagram, microstructure and thermal stabilities of the bulk quinary (CoCrFeMnNi) and quaternary (CoCrFeNi) HEA/CCAs are studied extensively in literature [2]. However, there are only a few articles on fcc CoCrFeNi and CoCrFeMnNi thin film counterparts [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanocrystalline equiatomic CoCrFeNi alloy thin films: Are they single phase fcc?

Kini

Lee

Savan

et al. 2021

Surface and Coatings Technology

View full text Add to dashboard Cite

The bulk quaternary equiatomic CoCrFeNi alloy is studied extensively in literature. Under experimental conditions, it shows a single-phase fcc structure and its physical and mechanical properties are similar to those of the quinary equiatomic CoCrFeMnNi alloy. Many studies in literature have focused on the mechanical properties of bulk nanocrystalline high entropy alloys or compositionally complex alloys, and their microstructure evolution upon annealing. The thin film processing route offers an excellent alternative to form nanocrystalline alloys. Due to the high nucleation rate and high density of defects in thin films synthesized by sputtering, the kinetics of microstructure evolution is often accelerated compared to those taking place in the bulk. Here, thin films are used to study the phase evolution in nanocrystalline CoCrFeNi deposited on Si/SiO 2 and c-sapphire substrates by magnetron cosputtering from elemental sources. The phases and microstructure of the films are discussed in comparison to the bulk alloy. The main conclusion is that second phases can form even at room temperature provided there are sufficient nucleation sites.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Limited data available in the literature suggests that the quaternary CoCrFeNi alloy forms nanocrystalline thin films [17,18]. Recently, atom probe tomography (APT) samples of quinary alloy with a nanocrystalline microstructure were deposited on a Si micro-tip array [21][22][23] by magnetron co-sputtering.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline equiatomic CoCrFeNi alloy thin films: Are they single phase fcc?

Kini

Lee

Savan

et al. 2021

Surface and Coatings Technology

View full text Add to dashboard Cite

show abstract

“…Three different zones have been identified: zone I where Ts<<Tm and the formation of narrow grains due to low diffusion, zone II where Ts and Tm are closer to each other and large grains can form; and an intermediate zone, zone T in between 1 and 2 where Ts<Tm and competitive growth can occur. For CoCrFeNi thin films, columnar growth is recurrent in literature [45][46][47][48]61,62,66], and some have identified zone T at low temperatures (T<500°C) [45,47] and zone II for higher temperatures (T=900°C) [45].…”

Section: Growth Models For Thin Filmsmentioning

confidence: 98%

“…CoCrFeNi variants have extensively been synthesised by magnetron sputtering [45][46][47][48][49]. The focus of the sputtered film studies has, however, not always been corrosion properties.…”

Section: Multicomponent Coatings and Thin Filmsmentioning

confidence: 99%

See 1 more Smart Citation

Catalytically active and corrosion resistant cobalt-based thin films

Linder

2022

Linköping Studies in Science and Technology. Licentiate Thesis

View full text Add to dashboard Cite

Powder Metallurgy Route for the Synthesis of Multiprincipal Element Alloys Sputtering Targets

et al. 2022

View full text Add to dashboard Cite

With the advent of high-entropy alloys (HEAs) in the early 2000s, [1,2] the research activities in the branch of physical metallurgy gained new momentum as witnessed by the huge amount of papers produced on these materials. [3][4][5] The specific term was coined by Yeh and co-workers who attributed the stabilization of simple solid solution phases, often observed in these systems, to high configurational entropy. [2] Restrictions were set on both number of principal elements (≥5) and their concentrations (5-35 at%). [2] In a recent review, Miracle and Senkov suggested to use the broader terms multiprincipal element alloys (MPEAs), complex concentration alloys (CCAs), and baseless alloys (BAs) in order to better conceptualize the immense design space offered by nonconventional alloys without putting limits on composition and microstructure. [4] The 3d transition metal family of MPEAs is by far the most studied one and it can be compared to stainless steels and superalloys. [4] This family contains at least four of the elements Al, Co, Cr, Cu, Fe, Mn, Ni, Ti, and V. [4] Common 4-element branches of this popular alloy family are FeNiCrCo and FeNiCrMn. Being comparable to commercial structural materials, much work has been focused on mechanical properties and their relations to composition and microstructure. In particular, the distinct roles played by Al, Sn, and Nb have been evidenced. [4] Another important area of study is the environmental resistance of structural materials in terms of, e.g., corrosion and wear resistance. [4]

show abstract

Microstructural characterization of medium entropy alloy thin films

Cited by 31 publications

References 37 publications

Nanocrystalline equiatomic CoCrFeNi alloy thin films: Are they single phase fcc?

Nanocrystalline equiatomic CoCrFeNi alloy thin films: Are they single phase fcc?

Catalytically active and corrosion resistant cobalt-based thin films

Powder Metallurgy Route for the Synthesis of Multiprincipal Element Alloys Sputtering Targets

Contact Info

Product

Resources

About