Hot deformation behaviour and microstructure control in AlCrCuNiFeCo high entropy alloy

Nayan, Nafarizal; Singh, Govindra; Murty, S. V. S. Narayana; Jha, Abhay K.; Pant, Bhanu; George, K. E.; Ramamurty, Upadrasta

doi:10.1016/j.intermet.2014.07.019

Cited by 91 publications

(17 citation statements)

References 37 publications

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“…As is known, Q is an important physical parameter indicating the deformation difficulty degree during plastic deformation. The activation energy calculated in this paper is similar to CoCuFeNiTi (~316 kJ/mol) [24] and AlCrCuNiFeCo (~306 kJ/mol) [28] HEAs reported previously. The influence of temperature and strain rate on hot deformation behavior can be described by Zener-Holloman parameter, Z [29]:…”

Section: Constitutive Modelingsupporting

confidence: 87%

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Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

Wang

Niu

et al. 2016

Metals

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Abstract:The hot deformation behavior of as-cast and homogenized Al 0.5 CoCrFeNi high entropy alloys (HEAs) during isothermal compression was investigated as a function of temperature and strain rate. Results indicated that flow stress in a homogenized state was always higher than that in an as-cast state under the same deformation conditions. Moreover, the optimum thermo-mechanical processing (TMP) conditions for the hot working of the homogenized state were identified as 945-965 • C and 10 −1.7 -10 −1.1 s −1 and were easier to determine in practice. Constitutive equations, for both states, correlating the flow stress of Al 0.5 CoCrFeNi with strain rate and deformation temperature were also determined.

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Section: Constitutive Modelingsupporting

confidence: 87%

“…ε), and temperature (T) has been illustrated using constitutive equations derived by several models [25][26][27]. The Arrhenius model is mostly used because the effect of strain rate and temperature are well considered [28]. In this section, we take the homogenized Al 0.5 CoCrFeNi HEA as an example.…”

Section: Constitutive Modelingmentioning

confidence: 99%

Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

Wang

Niu

et al. 2016

Metals

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“…This trend indicates that a small volume of casting pores did not influence the tensile performance at elevated temperatures, because the cracks initiated along grain boundaries instead of the existing casting pores. The intergranular cracks formed during the tensile loading at 700 o C also found in other cast dendritical HEAs subject to room-temperature tensile loading (cast Al8Co17Cr17Cu8Fe17Ni33 [64]), and high-temperature compression loading (cast AlCoCrCuFeNi [65], cast Cr-Nb-Ti-V-Zr system [12]), which indicate that the weak parts in cast dendritical HEAs usually locate at the intersections of several grain boundaries.…”

Section: Crack Initiation Subjected To Tensile Loadingmentioning

confidence: 78%

Tensile ductility of an AlCoCrFeNi multi-phase high-entropy alloy through hot isostatic pressing (HIP) and homogenization

Tang

Senkov

Parish

et al. 2015

Materials Science and Engineering: A

209

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The microstructure and phase composition of an AlCoCrFeNi high-entropy alloy (HEA) were studied in as-cast (AlCoCrFeNi-AC, AC represents as-cast) and homogenized (AlCoCrFeNi-HP, HP signifies hot isostatic pressed and homogenized) conditions. The AlCoCrFeNi-AC ally has a dendritrical structure in the consisting primarily of a nano-lamellar mixture of A2 [disorder body-centered-cubic (BCC)] and B2 (ordered BCC) phases, formed by an eutectic reaction. The homogenization heat treatment, consisting of hot isostatic pressed for 1 hour at 1,100 °C, 207 MPa and annealing at 1,150 °C for 50 hours, resulted in an increase in the volume fraction of the A1 phase and formation of a Sigma () phase. Tensile properties in ascast and homogenized conditions are reported at 700 °C. The ultimate tensile strength was virtually unaffected by heat treatment, and was 396 ± 4 MPa at 700 °C. However, 2 homogenization produced a noticeable increase in ductility. The AlCoCrFeNi-AC alloy showed a tensile elongation of only 1.0 %, while after the heat-treatment, the elongation of AlCoCrFeNi-HP was 11.7 %. Thermodynamic modeling of non-equilibrium and equilibrium phase diagrams for the AlCoCrFeNi HEA gave good agreement with the experimental observations of the phase contents in the AlCoCrFeNi-AC and AlCoCrFeNi-HP. The reasons for the improvement of ductility after the heat treatment and the crack initiation subjected to tensile loading were discussed.

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“…A key challenge in HEA research is unearthing the response of these materials during thermo-mechanical processing (TMP) [13][14][15][16][17][18][19]. Appropriate understanding of the TMP response of these materials can significantly affect the microstructure and mechanical properties of HEAs [12,[20][21][22][23][24][25][26][27][28][29][30][31][32][33] and expand their potential for large scale structural applications. TMP routes involve heavy deformation and annealing, which affect the development of characteristic microstructure and crystallographic texture [34,35].…”

Section: Introductionmentioning

confidence: 99%

Effect of starting grain size on the evolution of microstructure and texture during thermo-mechanical processing of CoCrFeMnNi high entropy alloy

Sathiaraj

Bhattacharjee

2015

Journal of Alloys and Compounds

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Hot deformation behaviour and microstructure control in AlCrCuNiFeCo high entropy alloy

Cited by 91 publications

References 37 publications

Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

Hot Deformation Behavior of As-Cast and Homogenized Al0.5CoCrFeNi High Entropy Alloys

Tensile ductility of an AlCoCrFeNi multi-phase high-entropy alloy through hot isostatic pressing (HIP) and homogenization

Effect of starting grain size on the evolution of microstructure and texture during thermo-mechanical processing of CoCrFeMnNi high entropy alloy

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