Additive Manufacturing of CrFeNiTi Multi-Principal Element Alloys.

Content Provider	Europe PMC
Author	Reiberg, Marius Hitzler, Leonhard Apfelbacher, Lukas Schanz, Jochen Kolb, David Riegel, Harald Werner, Ewald
Editor	Wichniarek, Radosław
Copyright Year	2022
Abstract	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.
Journal	Materials (Basel)
Volume Number	15
DOI	10.3390/ma15227892
PubMed Central reference number	PMC9698306
Issue Number	22
PubMed reference number	36431376
e-ISSN	19961944
Language	English
Publisher	Molecular Diversity Preservation International (MDPI)
Publisher Date	2022-11-08
Access Restriction	Open
Subject Keyword	high entropy alloy mechanical alloying powder-bed fusion materials characterization micro-hardness
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science