Effects of 1 at.% additions of Co, Fe, Cu, and Cr on the properties of Ni-Mn-Ga-based magnetic shape memory alloys

被引：11
作者：
Namvari, Mahsa [1 ]
Laitinen, Ville [1 ]
Sozinov, Alexei [1 ]
Saren, Andrey [1 ]
Ullakko, Kari [1 ]
机构：
[1] Lappeenranta Lahti Univ Technol LUT, Mat Phys Lab, Lappeenranta 53850, Finland
来源：
SCRIPTA MATERIALIA | 2023年 / 224卷
基金：
芬兰科学院;
关键词：
Ferromagnetic shape memory; Martensitic phase transformation; Grain growth; Twinning; Ni-Mn-Ga; FIELD-INDUCED STRAINS; TWIN-BOUNDARY MOTION; PHASE; MICROSTRUCTURE; TRANSFORMATION; SEGREGATION; ANISOTROPY;
D O I：
10.1016/j.scriptamat.2022.115116
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effect of Mn substitution with 1 at.% additions of Co, Fe, Cu, and Cr on the properties of a polycrystalline Ni49.8Mn28.5Ga21.7 magnetic shape memory (MSM) alloy after heat-treatment is examined. Doped alloys exhibit a single-phase five-layered modulated martensite structure at ambient temperature and a slight increase in martensite transformation temperatures compared to the non-doped alloy, without a substantial alteration of the Curie temperature. Cr addition decreases the grain size, while additions of Co, Fe, and Cu increase the grain size, as compared to the non-doped alloy. Particularly, Co addition leads to extreme grain growth, transforming the grain structure from polycrystalline to oligocrystalline with an average grain diameter of 2.83 mm. The Co-doped alloy demonstrates an MSM effect with a low switching field of H<0.15 T and a twinning stress of 1 MPa, which is a promising composition for use in polycrystalline-based MSM research and applications.
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页数：6
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