Correlation of microsegregation and variant distribution in directionally solidified Ni-Mn-Ga alloys. (November 2018)

• Record Type: Journal Article
• Authors: Hou, Long; Dai, Yanchao; Fautrelle, Yves; Li, Zongbin; Ren, Zhongming; Esling, Claude; Li, Xi
• Is Part Of: Scripta materialia. Number 156(2018)
• Page Start: 95
• Page End: 100
• Publication Date: 2018-11
• Subjects: Magnetic shape memory alloys (MSMAs) -- Microsegregation -- Orientation -- Variant distribution -- Directional solidification; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.07.019
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: In this work, the microsegregation and variant distribution in directionally solidified Ni-Mn-Ga alloys have been investigated. The results show that the martensitic variant distribution changed dramatically, as well as a decrease in microsegregation between dendrite core and interdendritic regions, after the directionally solidified samples underwent a high-temperature heat treatment. Further theoretical calculations reveal that the preferential martensitic configuration is accommodated with martensitic-transformation-induced stress in the Ni-Mn-Ga alloys with pronounced microsegregation. This finding is of significance as it highlights the role of microsegregation in variant distribution and provides a possible way to obtain martensite with a controllable variant distribution. Graphical abstract: Unlabelled Image