|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advances in Multi-Principal Elements Alloys X: Alloy Development and Properties
||Solidification Behavior and Mechanical Performance of Ductile Mn35Fe5Co20Ni20Cu20 MPEA Brazing Filler
||Benjamin Schneiderman, Andrew Chihpin Chuang, Olivia DeNonno, Jonah Klemm-Toole, Zhenzhen Yu
|On-Site Speaker (Planned)
A novel MPEA of approximate composition Mn35Fe5Co20Ni20Cu20 was developed as a filler material for brazed joining and repair of nickel-base superalloys. A direct comparison of mechanical properties was made to a conventional boron-suppressed filler alloy commercially available for the same application, with nickel-base alloy 600 as the substrate for demonstration. Relative to the commercial filler, the MPEA offered comparable strength and one order of magnitude greater ductility, at both room temperature and 600°C. Joints brazed with the boron-suppressed filler exhibited cleavage failure at less than 1% elongation, while joints brazed with the MPEA showed ductile microvoid coalescence and greater than 10% elongation. The improved ductility resulted from single-phase solidification to a face-centered cubic matrix phase in the MPEA, which prevented brittle eutectic microconstituents from populating the MPEA joint microstructure. The MPEA filler thus offers a novel approach to circumvent brittle phase formation that has plagued superalloy braze repair for decades.
||High-Entropy Alloys, Solidification, Mechanical Properties