Abstract
Recent interest in Fe–Co–Sn alloys stems from Heusler alloys. A Co2FeSn Heusler alloy is found to be unstable relative to other phases from ab initio calculations. However, it may be synthesized by non-equilibrium techniques. The present work focuses similarly on metastable ordered phases in ternary Fe–Co–Sn alloys. First, disordered phases of Sn in near-equiatomic Fe–Co are prepared by high-energy ball-milling. As-milled powders are then annealed to possibly produce long-range ordered phases. As-milled powders, of overall composition Fe53.3−0.6xCo46.7−0.4xSnx (2 ≤ x ≤ 34), consist of a single supersaturated bcc phase for x < ~15 at.%. For larger values of x, they are primarily composed of a bcc phase, whose tin content still increases up to ~26 at.%, and of extra phases, which include hexagonal (Fe,Co)3Sn2. Neutron diffraction patterns and 119Sn Mossbauer spectra prove that bcc phases of as-milled alloys order to CsCl (B2)-type structures for x ≤ 26 when annealed at 673 K. In addition, 119Sn Mossbauer spectra reveal that a Sn content of ~15 at.% marks the separation between domains with different short-range orders. From previous and present results, metastable B2 ordering of Sn-rich Co–Fe–Sn alloys is concluded to occur over a significant concentration range.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.