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.

引用

页数：6

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