【摘要】 外延生长Ni–Mn-Ga哈斯勒合金具有多种优异的磁控功能行为，是智能传感驱动、新型固态制冷等领域极具前景的候选材料。Ni-Mn-Ga-Fe合金是具有代表性的一类，其能对外磁场的作用做出积极响应。以快速凝固熔体抽拉法制备Ni-Mn-Ga-Fe形状记忆合金微丝，Fe的掺杂量从1%～6%，测试有序化热处理后磁场平行和垂直微丝两个特征方向的磁滞回线。研究表明，在两个方向上存在磁晶各向异性，且平行微丝方向为易磁化方向；对比热处理前后微丝的磁性能发现，室温下制备态微丝难磁化，表现出强磁晶各向异性，热处理后Fe含量小于3%时，具有高饱和磁化强度和低饱和场，当Fe含量大于3%时，合金饱和磁化强度降低，饱和磁场增大。主要以Ni₅₀Mn₂₅Ga₁₉Fe₆合金微丝为核心，揭示了材料磁性能受多种因素影响，提供了对形状记忆合金更为全面的理解，为开发高性能形状记忆合金微丝提供理论基础和实验支持。更多还原

【Abstract】 Ni-Mn-Ga Hasler alloys of epitaxially grown exhibit multiple outstanding magneto-functional behaviors,making them highly promising candidate materials for applications such as smart sensing and actuation,as well as novel solid-state refrigeration.Ni-Mn-Ga-Fe alloys represent a representative class,capable of actively responding to external magnetic fields.Prepared Ni-Mn-Ga-Fe shape memory alloy fibers using the rapid solidification melt-pulling method.with Fe doping levels ranging from 1% to 6%.Hysteresis loops were measured for both magnetization-parallel and magnetization-perpendicular fibers after ordering heat treatment.Results indicate magnetic crystalline anisotropy exists in both directions,with the parallel microfilament direction being the easy magnetization direction.Comparing magnetic properties before and after heat treatment reveals that as-prepared wires exhibit difficult magnetization at room temperature with strong magnetic anisotropy.After heat treatment,fiber with Fe content below 3% demonstrate high saturation magnetization and low saturation field,while those above 3% show reduced saturation magnetization and increased saturation field.Primarily focuses on Ni₅₀Mn₂₅Ga₁₉Fe₆ alloy fibers to reveal how material magnetic properties are influenced by multiple factors,providing a more comprehensive understanding of shape memory alloys.The research offers theoretical foundations and experimental support for developing high-performance shape memory alloy fibers.更多还原