Cellular microstructures superposed on martensite plates in Mn55.2Ga19.0Cu25.8 alloy showing large coercivity. (1st July 2017)

• Record Type: Journal Article
• Authors: Sawada, R.; Yamamoto, T.; Minakuchi, K.; Nagasako, M.; Hayasaka, Y.; Niitsu, K.; Cho, Y.; Kainuma, R.; Murakami, Y.
• Is Part Of: Scripta materialia. Number 135(2017)
• Page Start: 33
• Page End: 36
• Publication Date: 2017-07-01
• Subjects: Transmission electron microscopy -- Martensitic transformation -- L10-type ordered structure -- Coercivity -- Phase separation; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.03.013
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The microstructure in a Mn55.2 Ga19.0 Cu25.8 alloy that exhibits both martensitic and diffusional phase transformations was examined by electron microscopy, and the potential effects of these transformations on the large coercivity (~ 2 T) were discussed. The alloy showed a cellular microstructure, composed of a cuboidal matrix enveloped by a boundary phase, and superposed on well-defined martensite plates. Since the boundary phase is enriched by the non-magnetic element Cu, it may serve as magnetic isolation for the matrix region with a face centered tetragonal lattice formed by the martensitic transformation, or offer potential pinning sites for magnetic domain walls. Graphical abstract: