Journal
MATERIALS
Volume 15, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/ma15062072
Keywords
meta-magnetic shape memory alloys; magnetostructural transformation; magnetostrain; external field training; texture
Categories
Funding
- National Natural Science Foundation of China [52171005]
- Fundamental Research Funds for the Central Universities of China [N2102006]
- Liaoning Revitalization Talents Program [XLYC1907082]
- 111 Project of China 2.0 [BP0719037]
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Enhanced spontaneous magnetostrain was achieved in a directionally solidified alloy through microstructure texturing and superelastic training. The study provides an important solution for the application of magnetic shape memory alloys.
Large magnetostrain can be demonstrated in Ni-Mn-X (X = In, Sn, Sb) meta-magnetic shape memory alloys by resuming the predeformed martensite through magnetic-field-induced reverse martensitic transformation. However, owing to the constraint from the self-accommodated microstructure and randomly distributed crystallographic orientation, spontaneous magnetostrain without predeformation in polycrystalline alloys remains low. Here, by combining microstructure texturing and superelastic training, enhanced spontaneous magnetostrain was achieved in a directionally solidified Ni44.5Co4.9Mn37.5In13.1 alloy with strong <0 0 1>(A) preferred orientation. After superelastic training through cyclic compressive loading/unloading on the directionally solidified alloy, a large spontaneous magnetostrain of similar to 0.65% was obtained by applying a magnetic field of 5 T, showing great improvement when compared to that of the untrained situation, i.e., similar to 0.45%. Such enhanced magnetoresponse is attributed to the internal stress generated through superelastic training, which affects the variant distribution and the resultant output strain in association with the martensitic transformation.
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