高师理科学刊2026，Vol.46Issue(5)：35-39,88,6.DOI:10.3969/j.issn.1007-9831.2026.05.006
Ni50Mn25Ga22Cu3形状记忆合金纤维的磁热性能
Magnetocaloric properties of Ni50Mn25Ga22Cu3 shape memory alloy microwires
摘要
Abstract
Ni50Mn25Ga22Cu3 ferromagnetic shape memory alloy microwires were successfully fabricated by the melt extraction method.The effects of Cu doping on the microstructure,martensitic transformation,magnetic transition,and magnetocaloric properties of the alloy were investigated.The microwires,with an average diameter of approximately 25 μm,exhibited uniform composition and microstructure.Post-fabrication heat treatment effectively increased the martensitic transformation temperature to near room temperature.X-ray diffraction analysis revealed distinct structural evolution,indicating a partially coupled magnetostructural transition.Magnetic measurements showed that under a magnetic field change of 5 T,the alloy microwires achieved a maximum magnetic entropy change of approximately 8.0 J·kg-1·K-1 around 308 K and 4.0 J·kg-1·K-1 around 350 K.The corresponding refrigeration capacities and relative cooling powers were 34.8,43.3 J·kg-1 for the low-temperature peak,and 173.1,228.3 J·kg-1 for the high-temperature peak,respectively.The results demonstrate that Cu doping combined with fiber morphology is an effective approach to tailor the magnetocaloric properties of Ni-Mn-Ga alloys,highlighting their potential for room-temperature magnetic refrigeration applications.关键词
Ni-Mn-Ga-Cu合金/磁热效应/熔体抽拉法Key words
Ni-Mn-Ga-Cu alloy/magnetocaloric effect/melt extraction method分类
数理科学引用本文复制引用
刘艳芬,闫朴涵,侯庆楠,李金浩,沈红先,张学习,孙剑飞..Ni50Mn25Ga22Cu3形状记忆合金纤维的磁热性能[J].高师理科学刊,2026,46(5):35-39,88,6.基金项目
国家自然科学基金项目(51701099) （51701099）
黑龙江省自然科学基金(LH2019E091) （LH2019E091）
黑龙江省省属高等学校基本科研业务费(145509227) （145509227）
