Heat treatment influence on the microstructure and mechanical properties of AlCrFeNiTi0.5 high entropy alloys

Munitz, A.; Salhov, S.; Guttmann, Gilad M.; Derimow, Nicholas; Nahmany, Moshe

doi:10.1016/j.msea.2018.10.114

Cited by 47 publications

(8 citation statements)

References 39 publications

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“…These recently discovered advanced materials [ 4 ] have been in the attention of researchers all over the world, both academics and technologists [ 5 , 6 ]. HEAs became important due to the uniqueness of their composition, simple and micro-amorphous microstructure and their functional properties [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Cutting Behavior of Al0.6CoCrFeNi High Entropy Alloy

et al. 2020

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There is an increased interest in high entropy alloys as a result of the special possibilities of improving the mechanical, physical or chemical characteristics resulting from metallic matrices made of different chemical elements added in equimolar proportions. The next step in developing new alloys is to determine the cutting conditions to optimize manufacturing prescriptions. This article presents a series of tests performed to estimate the machining behavior of the Al0.6CoCrFeNi high entropy alloy. The effects of temperature during machining, wear effects on the cutting tool, evolution of the hardness on the processed areas, cutting force components and resultant cutting force for high entropy alloy (HEA) in comparison with 304 stainless steel, scrap aspect and machined surface quality were analyzed to have an image of the HEA machinability. In terms of cutting forces, the behavior of the HEA was found to be about 59% better than that of stainless steel. XRD analysis demonstrated that the patterns are very similar for as-cast and machined surfaces. The wear effects that appear on the cutting edge faces for the tool made of rapid steel compared to carbide during HEA machining led to the conclusion that physical vapor deposition (PVD)-coated carbide inserts are suitable for the cutting of HEAs.

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Section: Introductionmentioning

confidence: 99%

Cutting Behavior of Al0.6CoCrFeNi High Entropy Alloy

et al. 2020

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“…Composition adjustment and post-processing could effectively optimize the microstructure of metals [27][28][29][30]. One of the ideal ways to solve this issue of AlCoCrFeNi system should be composition adjustment followed by heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ti and Cu on the Microstructure Evolution of AlCoCrFeNi High-Entropy Alloy During Heat Treatment

Shi

Feng

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The microstructure evolution of AlCoCrFeNiTi 0.5 alloy and AlCoCrFeNiCu alloy during heat treatment was systematically studied, to reveal the influence rules of chemical activity of adding element on the microstructure evolution of AlCoCrFeNi system. Owing to the negative mixing enthalpy with the constituent elements, Ti element was mainly dissolved in the Al-Nirich phases, and aggravated the lattice distortion of B2 phase. The structure variation of BCC phase by adding Ti inhibited the formation of FCC phase and enhanced the precipitation of σ phase during heat treatment. Owing to the positive mixing enthalpy with constituent elements, Cu element tended to be repelled to the ID region and formed metastable Cu-rich FCC1 phase which would transform into Cu-Al-Ni-rich FCC2 phase with increasing temperature. The addition of Cu inhibited the precipitation of σ phase during heat treatment. Adding Ti maintained the stable dendritic morphology, while adding Cu reduced the thermal stability of microstructure. Two dramatic morphology changes occurred at 1000 °C and 1100 °C in the AlCoCrFeNiCu alloy. The lattice distortion of phase in AlCoCrFeNiTi 0.5 alloy was aggravated with increasing temperature up to 800 °C, then relaxed together with the dissolution of σ phase when temperature was above 900 °C. The variation in lattice distortion dominated the hardness of AlCoCrFeNiTi 0.5 alloy. With increasing heating temperature, the increasing volume fraction of region with FCC structure due to the transformation between FCC phases, and the pronounced coarsening in microstructure due to the reduced thermal stability, resulted in the mainly decreasing trend in the hardness of AlCo-CrFeNiCu alloy.

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“…[43] Unfortunately, previous studies have shown that results from Thermo-Calc calculations, such as, for example, phase compositions, phase transformation temperature, and chemical compositions of phases differ to some extent from experiment results. [44][45][46] However, combining dilatometry measurements with in situ neutron diffraction data, the phase transformation type and transformation temperature of HEAs can be determined conveniently from an analysis of the length change signal from dilatometry, and the integrated peak intensity and peak position change from in situ neutron diffraction measurements. Thus, an approach using thermodynamic calculations with combined neutron diffraction and dilatometry can substantially reduce the efforts in the development of new HEA systems.…”

Section: Phase Transformation In Heasmentioning

confidence: 99%