A special single variant zone in directionally solidified Ni-Mn-Ga alloy. (1st July 2019)

• Record Type: Journal Article
• Authors: Dai, Yanchao; Hou, Long; Chulist, Robert; Fautrelle, Yves; Li, Zongbin; Yang, Bo; Esling, Claude; Ren, Zhongming; Li, Xi
• Is Part Of: Scripta materialia. Number 167(2019)
• Page Start: 105
• Page End: 109
• Publication Date: 2019-07-01
• Subjects: Ferromagnetic shape memory alloy -- Directional solidification -- Martensitic phase transformation -- Single variant -- EBSD; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.04.005
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Three distinct structures comprising self-accommodated solid zone, (110)M preferred oriented liquid zone and (001)M oriented single variant zone were discovered in directionally solidified Ni-Mn-Ga alloy rod. The preferred (110)M orientation in liquid zone directly causes a special single variant zone to form around quenching interface. It is attributed to a longitudinal, suddenly-shrinking lattice, produced in the liquid zone after martensitic transformation, which induces a tension force at the joint. A tensile test simulates and validates the formation of single variant induced by inner force. A mechanism of variant formation is described in the present study, too. Graphical abstract: Unlabelled Image