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Enhanced Magnetostrain in a A-Textured Ni44.5Co4.9Mn37.5In13.1 Alloy through Superelastic Training
Lanyu Guo1, Zongbin Li1, Jiaxing Chen1
1Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China.
Researchers enhanced spontaneous magnetostrain in Ni-Mn-In alloys. Microstructure texturing and superelastic training significantly improved the magnetic-field-induced strain in shape memory alloys without predeformation.
Area of Science:
- Materials Science
- Metallurgy
- Physics
Background:
- Ni-Mn-X (X = In, Sn, Sb) magnetic shape memory alloys exhibit large magnetostrain via magnetic-field-induced reverse martensitic transformation.
- Polycrystalline alloys show limited spontaneous magnetostrain due to microstructural constraints and random crystallographic orientation.
Purpose of the Study:
- To enhance spontaneous magnetostrain in Ni-Mn-In alloys without predeformation.
- To investigate the effect of microstructure texturing and superelastic training on magnetoresponse.
Main Methods:
- Directional solidification of Ni44.5Co4.9Mn37.5In13.1 alloy to achieve <0 0 1>A preferred orientation.
- Superelastic training via cyclic compressive loading and unloading.
- Measurement of spontaneous magnetostrain under a 5 T magnetic field.
Main Results:
- A strong <0 0 1>A preferred orientation was achieved in the directionally solidified alloy.
- Superelastic training increased spontaneous magnetostrain from ~0.45% to ~0.65% at 5 T.
- Enhanced magnetoresponse is linked to internal stress from training influencing variant distribution.
Conclusions:
- Combining microstructure texturing and superelastic training is effective in enhancing spontaneous magnetostrain in Ni-Mn-In alloys.
- Internal stresses generated during training play a crucial role in improving the magnetic-field-induced strain response.
- This approach offers a pathway to improved performance in magnetic shape memory alloys for actuator applications.
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