High-temperature phase characterization of AlCrFeNiTi compositionally complex alloys

Reiberg, Marius; Duan, Chuyi; Li, Xiaohu; Werner, Ewald

doi:10.1016/j.matchemphys.2021.125272

Cited by 2 publications

(2 citation statements)

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“…The number of possible HEA compositions is indeed immense, especially when the related groups of complex-concentrated alloys (CCAs) and multi-principal element alloys (MPEAs) are also considered. AlCrFeNiTi alloys have been successfully processed via solid-state sintering and are known for their formation of a multiphase microstructure [4][5][6]. Thus, the terminology MPEA, instead of HEA, is used throughout this study.…”

Section: Introductionmentioning

confidence: 99%

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Additive Manufacturing of CrFeNiTi Multi-Principal Element Alloys

Reiberg¹,

Hitzler²,

Apfelbacher³

et al. 2022

Materials

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High entropy alloys (HEAs) and their closely related variants, called multi-principal element alloys (MPEAs), are the topic of a rather new area of research, and so far, the gathered knowledge is incomplete. This is especially true when it comes to material libraries, as the fabrication of HEA and MPEA samples with a wide variation in chemical compositions is challenging in itself. Additive manufacturing technologies are, to date, seen as possibly the best option to quickly fabricate HEA and MPEA samples, offering both the melting metallurgical and solid-state sintering approach. Within this study, CrFeNiTi MPEA samples were fabricated via laser powder-bed fusion (PBF-LB) and solid-state sintering of mechanically alloyed powder feedstock. The main emphasis is on the PBF-LB process, while solid-state sintering serves as benchmark. Within a volumetric energy density (VED) window of 50 J/mm³ to 83 J/mm³, dense samples with large defect-free sections and an average micro-hardness of 965 HV0.1 were fabricated. Clear correlations between the local chemical alloy composition and the related micro-hardness were recorded, with the main factor being the evaporation of titanium at higher VED settings through a reduction in the C14_Laves phase fraction.

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Section: Introductionmentioning

confidence: 99%

“…The MPEA was prepared by mechanical alloying with an increased nickel content and a decreased aluminum content compared to previous powder metallurgical studies [4][5][6]. Out of the five elements-Al, Cr, Fe, Ni, and Ti-aluminum has the highest risk of evaporation in the PBF-LB process.…”

Section: Introductionmentioning

confidence: 99%