Microstructures and compressive properties of multicomponent AlCoCrFeNiMox alloys

Zhu, Jingxian; Fu, Huameng; Zhang, H.F.; Wang, A.M.; Li, H.; Hu, Z. Q.

doi:10.1016/j.msea.2010.07.028

Cited by 226 publications

(80 citation statements)

References 6 publications

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“…[17,50] Addition of Mo to the system generally leads to the formation of (Cr, Mo, Co, Fe)-rich σ phase. [80][81][82][83][84][85][86][87] σ phase is a very hard and brittle intermetallic phase. As mentioned previously, it significantly enhances the hardness of the alloy but reduces its ductility/plasticity.…”

Section: Derivatives Of the Al-co-cr-cu-fe-ni Alloymentioning

confidence: 99%

High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

2,507

853

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High-entropy alloys (HEAs) are alloys with five or more principal elements. Due to the distinct design concept, these alloys often exhibit unusual properties. Thus, there has been significant interest in these materials, leading to an emerging yet exciting new field. This paper briefly reviews some critical aspects of HEAs, including core effects, phases and crystal structures, mechanical properties, high-temperature properties, structural stabilities, and corrosion behaviors. Current challenges and important future directions are also pointed out.

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Section: Derivatives Of the Al-co-cr-cu-fe-ni Alloymentioning

confidence: 99%

High-Entropy Alloys: A Critical Review

Tsai

Yeh

2014

Materials Research Letters

2,507

853

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“…50,51 Elemental Mo can also favour pit repassivation in stainless steels. 52 However in HEAs/CCAs, Mo tends to form a Mo and Cr-rich sigma (σ) phase, 53,54 which could remove both Cr and Mo from the alloy matrix. This could be detrimental to the corrosion resistance of such Mo-containing CCAs if such a σ phase is present.…”

Section: The Influence Of Different Alloying Elements On the Corrosiomentioning

confidence: 99%

Corrosion of high entropy alloys

Qiu¹,

Thomas²,

Gibson³

et al. 2017

npj Mater Degrad

378

133

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High entropy alloys represent a unique class of metal alloys, comprising nominally five or more elements in near equiatomic proportions. High entropy alloys have gained significant interest on the basis that the high configurational entropy of such alloy systems is purported to result in a single-phase solid solution structure. While such a single-phase structure can occur in unique systems, it is now appreciated that the definition of high entropy alloys can be broader, with systems comprising only four elements possible of forming single phases, and most five (or more) element systems actually being multi (>2) phases. To this end, the notion of compositionally complex alloys is a more general description, with the concise review herein focusing on the corrosion of compositionally complex alloys (inclusive of high entropy alloys). It is noted that generally, in spite of complex compositions and in many cases complicated microstructural heterogeneity, compositionally complex alloys are nominally corrosion-resistant. This is discussed and aspects of the status and needs are presented.

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“…Numerous equiatomic multi-component alloys have been reported in the literature and some mechanical properties have been assessed with mixed results (e.g. [2][3][4][5][6][7][8][9][10][11][12]). Despite this considerable effort, little is known concerning the basic deformation mechanisms in this class of alloys due to the following main reasons.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the equiatomic alloys described in the literature do not consist of a single solid solution phase; instead, they contain multiple phases, including secondary solid solution phases and/or intermetallic compounds [6][7][8][9][10]. Thus, the measured mechanical properties, all obtained in compression, represent composite responses of the multiphase microstructures.…”

Section: Introductionmentioning

confidence: 99%

The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy

et al. 2013

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An equiatomic CoCrFeMnNi high-entropy alloy, which crystallizes in the face-centered cubic (fcc) crystal structure, was produced by arc melting and drop casting. The drop-cast ingots were homogenized, cold rolled and recrystallized to obtain single-phase microstructures with three different grain sizes in the range 4-160 lm. Quasi-static tensile tests at an engineering strain rate of 10 À3 s À1 were then performed at temperatures between 77 and 1073 K. Yield strength, ultimate tensile strength and elongation to fracture all increased with decreasing temperature. During the initial stages of plasticity (up to $2% strain), deformation occurs by planar dislocation glide on the normal fcc slip system, {1 1 1}h1 1 0i, at all the temperatures and grain sizes investigated. Undissociated 1/2h1 1 0i dislocations were observed, as were numerous stacking faults, which imply the dissociation of several of these dislocations into 1/6h1 1 2i Shockley partials. At later stages ($20% strain), nanoscale deformation twins were observed after interrupted tests at 77 K, but not in specimens tested at room temperature, where plasticity occurred exclusively by the aforementioned dislocations which organized into cells. Deformation twinning, by continually introducing new interfaces and decreasing the mean free path of dislocations during tensile testing ("dynamic Hall-Petch"), produces a high degree of work hardening and a significant increase in the ultimate tensile strength. This increased work hardening prevents the early onset of necking instability and is a reason for the enhanced ductility observed at 77 K. A second reason is that twinning can provide an additional deformation mode to accommodate plasticity. However, twinning cannot explain the increase in yield strength with decreasing temperature in our high-entropy alloy since it was not observed in the early stages of plastic deformation. Since strong temperature dependencies of yield strength are also seen in binary fcc solid solution alloys, it may be an inherent solute effect, which needs further study.

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Microstructures and compressive properties of multicomponent AlCoCrFeNiMox alloys

Cited by 226 publications

References 6 publications

High-Entropy Alloys: A Critical Review

High-Entropy Alloys: A Critical Review

Corrosion of high entropy alloys

The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy

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