Effect of Ti content and ball-milling time on the microstructural, thermal, and microhardness properties of AlCoCuNiTi high entropy alloys

Okumuş, Mustafa; Kaya, Feyzullah

doi:10.1016/j.matchemphys.2023.128591

Materials Chemistry and Physics

2024

DOI: 10.1016/j.matchemphys.2023.128591

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Effect of Ti content and ball-milling time on the microstructural, thermal, and microhardness properties of AlCoCuNiTi high entropy alloys

Mustafa Okumuş,

Feyzullah Kaya

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In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co_0.22Cr_0.23Fe_0.29Ni_0.20Ti_0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling

Kovalev,

Vadchenko,

Rogachev

2024

Adv Eng Mater

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In this report, the effect of Ti addition on the phase evolution of a near‐equiatomic CoCrFeNi‐based high‐entropy alloy (HEA) during annealing in a vacuum is described. The HEA Co0.22Cr0.23Fe0.29Ni0.20Ti0.06 is synthesized through mechanical alloying of constituent elements for a milling duration of 1 h. The as‐prepared HEA is a two‐phase alloy containing body centred cubic (BCC) precipitates in an face centred cubic (FCC) matrix. The thermal stability of the HEA is experimentally studied by subjecting it to 5 h of isothermal annealing at 600, 800, and 1000 °C, using high‐temperature X‐ray diffraction (HTXRD). The HTXRD analysis indicates a noteworthy reduction in the BCC phase content after isothermal annealing at 600 °C. The formation of intermetallic σ‐phases does not occur. At temperatures of 800 and 1000 °C, the alloy matrix exhibits a single‐phase FCC solid solution. At 800 and 1000 °C, HEA undergoes partial oxidation, resulting in the formation of oxide phases on the surface and within the particles of the powder in the form of nanoscale inclusions. This oxidation depletes the metal matrix with titanium, leading to a change in the composition of the HEA. The alloy transforms into a CoCrFeNi solid solution containing 3–4 at% Ti. Thus, the alloy matrix phase remains a stable FCC solid solution.

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In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co_0.22Cr_0.23Fe_0.29Ni_0.20Ti_0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling

Kovalev,

Vadchenko,

Rogachev

2024

Adv Eng Mater

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Microstructure, thermal and radiation shielding properties of aluminium‐silicon‐boron alloy prepared by mechanical alloying

Yaykaşlı,

Eskalen,

Göğebakan

et al. 2024

Materialwissenschaft Werkst

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This study focused on developing microstructural, thermal, and radiation shielding changes in Al50Si25B25 powders using mechanical alloying techniques. Based on the x‐ray powder diffraction data, the crystallite size and microstrain of the 100‐hours milled powder were calculated as 0.25 nm and 50.33 %, respectively. The solubility of silicon in the α‐aluminium matrix increased with longer mechanical alloying duration. Transmission electron microscope analyses further showed that the alloy particulates had an average size of 3 μm and an average grain size of 0.226 nm. The radiation shielding properties of the Al50Si25B25 powders indicated that the Linear Attenuation Coefficient value increased from 0.0554±0.1689 cm−1 to 1.0632±0.2425 cm−1 with an increase in the thickness of the Al50Si25B25 alloy. This work successfully demonstrated the potential of mechanical alloying techniques to enhance the microstructural and thermal properties of Al50Si25B25 powders. It highlighted their effectiveness in providing radiation shielding capabilities when varying the thickness of the alloy.

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Recent advancements in lightweight high entropy alloys – A comprehensive review

Kamal,

Ragunath,

Hema Sagar Reddy

et al. 2024

International Journal of Lightweight Materials and Manufacture

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Effect of Ti content and ball-milling time on the microstructural, thermal, and microhardness properties of AlCoCuNiTi high entropy alloys

Cited by 5 publications

References 74 publications

In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co_0.22Cr_0.23Fe_0.29Ni_0.20Ti_0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling

In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co_0.22Cr_0.23Fe_0.29Ni_0.20Ti_0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling

Microstructure, thermal and radiation shielding properties of aluminium‐silicon‐boron alloy prepared by mechanical alloying

Recent advancements in lightweight high entropy alloys – A comprehensive review

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Effect of Ti content and ball-milling time on the microstructural, thermal, and microhardness properties of AlCoCuNiTi high entropy alloys

Cited by 5 publications

References 74 publications

In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co0.22Cr0.23Fe0.29Ni0.20Ti0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling

In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co0.22Cr0.23Fe0.29Ni0.20Ti0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling

Microstructure, thermal and radiation shielding properties of aluminium‐silicon‐boron alloy prepared by mechanical alloying

Recent advancements in lightweight high entropy alloys – A comprehensive review

Contact Info

Product

Resources

About

In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co_0.22Cr_0.23Fe_0.29Ni_0.20Ti_0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling

In Situ High‐Temperature X‐ray Diffraction Study of the Thermal Stability of the Co_0.22Cr_0.23Fe_0.29Ni_0.20Ti_0.06 High‐Entropy Alloy Produced by High‐Energy Ball Milling