CAJ | 학술논문

采用泰勒法制备了直径范围在30~100μm之间的玻璃包裹Ni-Mn-In-Co合金纤维。利用综合物性测量系统(PPMS)研究了磁场对制备态和退火态纤维马氏体相变温度的影响，并且从M-B曲线中分别计算得出了制备态和退火态纤维的磁热效应。研究结果表明：制备态纤维在室温下为7M马氏体结构。在制备态和退火态纤维中，奥氏体相变开始温度随外加磁场变化速率(ΔAs/ΔB)分别为-1.6和-4 K/T。退火态纤维在As点附近发生磁场诱发马氏体向奥氏体逆相变。退火态纤维最大磁熵变为3.0 J/(kg·K)，远大于制备态纤维的0.5 J/(kg·K)。Ni-Mn-In-Co合金纤维的大磁熵变和低成本使其成为最具潜力的磁制冷材料之一。
채용태륵법제비료직경범위재30~100μm지간적파리포과Ni-Mn-In-Co합금섬유。이용종합물성측량계통(PPMS)연구료자장대제비태화퇴화태섬유마씨체상변온도적영향，병차종M-B곡선중분별계산득출료제비태화퇴화태섬유적자열효응。연구결과표명：제비태섬유재실온하위7M마씨체결구。재제비태화퇴화태섬유중，오씨체상변개시온도수외가자장변화속솔(ΔAs/ΔB)분별위-1.6화-4 K/T。퇴화태섬유재As점부근발생자장유발마씨체향오씨체역상변。퇴화태섬유최대자적변위3.0 J/(kg·K)，원대우제비태섬유적0.5 J/(kg·K)。Ni-Mn-In-Co합금섬유적대자적변화저성본사기성위최구잠력적자제랭재료지일。
Ni-Mn-In-Co microwires with diameter of 30-100μm are prepared by glass-coated metal filaments (Taylor-Ulitovsky) method. The effects of magnetic field on martensite transformation temperature in the as-prepared and annealed microwires are investigated using a physical property measurement system (PPMS). Magnetocaloric effect (MCE) attributed to field-induced austenite transformation in the as-prepared and annealed microwires is analyzed indirectly from the isothermal magnetization (M-B) curves. The as-prepared microwire has a 7-layer modulated martensite structure (7M) at room temperature. The changes of austenite starting temperature induced by an external magnetic field (ΔAs/ΔB) in the as-prepared and annealed microwires are-1.6 and-4 K/T, respectively. Inverse martensite to austenite transformation exists in annealed microwires when an external magnetic field is applied at temperatures nearAs. The entropy change (ΔS) obtained in the annealed microwires is 3.0 J/(kg·K), which is much larger than that in the as-prepared microwires 0.5 J/(kg·K). The large entropy change and low price make Ni-Mn-In-Co microwires a potential working material in magnetic refrigeration.