Influence of Ti addition and sintering method on microstructure and mechanical behavior of a medium-entropy Al 0.6 CoNiFe alloy

Fu, Zhiqiang; Chen, Weiping; Chen, Zhen; Wen, Haiming; Lavernia, Enrique J.

doi:10.1016/j.msea.2014.09.077

Cited by 83 publications

(21 citation statements)

References 46 publications

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“…Similarly, the mixing enthalpy of Fe and Cr is -1 kJ mol -1 and their atomic radii are very similar, thus the Fe-Cr-rich solid-solution phase can be formed easily. After adding Ti into the Al 0.75 FeNiCrCo alloy, since Ti has similar atomic radius and electronegativity with Al, thus the situation in the Al 0.75 FeNiCrCoTi 0.25 alloy is pretty similar to that of the Al 0.75 FeNiCrCo alloy.Nano-twinning occurred in some FCC structured phase of the bulk Al 0.75 FeNiCrCo HEA, the similar nanoscale twins in HEAs prepared by MA and SPS have also been observed in the previous studies[26,27,47]. The lamella thickness of the nanoscale twins of grain A inFig.5 (a)is ~50 nm.Fig.…”

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confidence: 80%

“…To date, a variety of experimental techniques, such as arc-melting [19,20], fluxed water quenching [21], melt spinning [22], injection casting [23], laser cladding [24,25], mechanical alloying (MA) [26,27], etc., have been explored to synthesize HEAs. Inspection of the published literature reveals that the most widely used method is arc-melting (casting), and composition segregation and inhomogeneous microstructures are usually observed in as-cast HEAs [8,28].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Co and Ti on microstructure and mechanical behavior of Al0.75FeNiCrCo high entropy alloy prepared by mechanical alloying and spark plasma sintering

Chen

et al. 2015

Materials Science and Engineering: A

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confidence: 80%

Section: Introductionmentioning

confidence: 99%

Effects of Co and Ti on microstructure and mechanical behavior of Al0.75FeNiCrCo high entropy alloy prepared by mechanical alloying and spark plasma sintering

Chen

et al. 2015

Materials Science and Engineering: A

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“…3 CoCrFeNi was tailored to produce triplex microstructure containing FCC, B2 and sigma via thermomechanical processing which resulted in a 400% increase in yield strength. Fu et al 21 studied the effect of Ti addition on Al 0.6 CoNiFe and they reported a high compressive yield stress of 2200 MPa and 6.2% ductility for spark plasma sintered Al 0.6 CoFeNi. The microstructure consisted of a mixture of ultra-fine FCC and BCC grains along with L1 2 precipitates in FCC phase.…”

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confidence: 99%

Hierarchical Eutectoid Nano-lamellar Decomposition in an Al0.3CoFeNi Complex Concentrated Alloy

Dasari

Gwalani

Jagetia

et al. 2020

Sci Rep

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this paper reports a novel eutectoid nano-lamellar (fcc + L1 2 )/(Bcc + B2) microstructure that has been discovered in a relatively simple Al 0.3 cofeni high entropy alloy (HeA) or complex concentrated alloy (CCA). This novel eutectoid nano-lamellar microstructure presumably results from the complex interplay between Al-mediated lattice distortion (due to its larger atomic radius) in a face-centered cubic (FCC) CoFeNi solid solution, and a chemical ordering tendency leading to precipitation of ordered phases such as L1 2 and B2. This eutectoid microstructure is a result of solid-state decomposition of the FCC matrix and therefore distinct from the commonly reported eutectic microstructure in HEAs which results from solidification. This novel nano-lamellar microstructure exhibits a tensile yield strength of 1074 MPa with a reasonable ductility of 8%. The same alloy can be tuned to form a more damagetolerant fcc + B2 microstructure, retaining high tensile yield stress (~900 MPa) with appreciable tensile ductility (>20%), via annealing at 700 °C. Such tunability of microstructures with dramatically different mechanical properties can be effectively engineered in the same CCA, by exploiting the complex interplay between ordering tendencies and lattice distortion.High entropy alloys (HEAs), also referred to as complex concentrated alloys (CCAs) or multi-principal element alloys (MPEAs), offer the ability to design novel microstructures that have not been possible with conventional alloys. In recent times, there has been a rapid increase in papers reporting such novel microstructures with excellent mechanical properties 1-7 . However, there are still many unanswered questions related to the influence of composition and processing on the phase stability, transformation pathways, and microstructural evolution in these complex alloys. In an effort to understand solid solution strengthening in HEAs, the room temperature and high temperature tensile properties of solutionized ternary and quaternary subsets of CoCrFeNiMn (Cantor alloy), CoCrFeNi, CoFeNi, CoCrNi etc. were studied by Wu et al. 8 . They reported that yield strength may not be necessarily a simple function of number of elements but it is a complex relation. Among the systems investigated, CoCrNi had the highest yield strengths overall, at tested temperatures. Since then, numerous investigations have been carried out on this alloy to understand its mechanical behavior 9,10 . Their work also shows that FCC single phase solid solutions in HEAs perform better than conventional FCC single phase alloys and thus strengthening the single phase HEAs with precipitation is anticipated to produce alloys with excellent mechanical properties.Addition of Al to 3d transition element-based face-centered cubic (FCC) high entropy alloys (HEAs), typically containing the elements Co, Cr, Fe, and Ni, results in substantial changes in their microstructure and mechanical properties. This is due to the tendency of Al to effectively introduce an ordering tendency within the FCC matrix, f...

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“…The XRD patterns shown in Fig. 1 [8,24]. In the milled powders, a substantial amount of energy is stored because of the high dislocation density and the significant volume fraction of grain boundaries [25,26].…”

Section: Crystal Structures and Morphologies Of Powders And Bulksmentioning

confidence: 99%

The high-entropy alloys with high hardness and soft magnetic property prepared by mechanical alloying and high-pressure sintering

et al. 2016

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The equiatomic multiprincipal CoCrFeCuNi and CoCrFeMnNi high-entropy alloys (HEAs) were consolidated via high pressure sintering (HPS) from the powders prepared by the mechanical alloying method (MA). The structures of the MA'ed CoCrFeCuNi and CoCrFeMnNi powders consisted of a face-centered-cubic (FCC) phase and a minority body-centered cubic (BCC) phase. After being consolidated by HPS at 5 GPa, the structure of both HEAs transformed to a single FCC phase. The grain sizes of the HPS'ed CoCrFeCuNi and CoCrFeMnNi HEAs were about 100 nm. The alloys keep the FCC structure until the pressure reaches 31 GPa. The hardness of the HPS'ed CoCrFeCuNi and CoCrFeMnNi HEAs were 494 Hv and 587 Hv,

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Influence of Ti addition and sintering method on microstructure and mechanical behavior of a medium-entropy Al 0.6 CoNiFe alloy

Cited by 83 publications

References 46 publications

Effects of Co and Ti on microstructure and mechanical behavior of Al0.75FeNiCrCo high entropy alloy prepared by mechanical alloying and spark plasma sintering

Effects of Co and Ti on microstructure and mechanical behavior of Al0.75FeNiCrCo high entropy alloy prepared by mechanical alloying and spark plasma sintering

Hierarchical Eutectoid Nano-lamellar Decomposition in an Al0.3CoFeNi Complex Concentrated Alloy

The high-entropy alloys with high hardness and soft magnetic property prepared by mechanical alloying and high-pressure sintering

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