Magnetic field-induced strain in iron-based ferromagnetic shape memory alloys
Magnetic field-induced strain in iron-based ferromagnetic shape memory alloys
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DOI：
10.1063/1.1540132
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发表时间：
2003-05
影响因子：
3.2
通讯作者：
Tatsuaki Sakamoto;T. Fukuda;T. Kakeshita;T. Takeuchi;K. Kishio
中科院分区：
文献类型：
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作者：
Tatsuaki Sakamoto;T. Fukuda;T. Kakeshita;T. Takeuchi;K. Kishio
研究了无序Fe-31.2Pd（at.）合金中马氏体变体转变引起的沿着[001]P（符号“P”代表母相）方向的磁场诱导应变（MFIS）。%）单晶和有序的Fe_3Pt单晶，分别在85和230 K下表现出从立方相到四方相的马氏体相变。Fe-31.2Pd在77 K时的四方性c/a为0.940，Fe-3 Pt在14 K时的四方性c/a为0.945。当马氏体相沿着[001]P方向外加磁场时，Fe-31.2Pd样品沿磁场方向沿着膨胀，Fe-31.2Pt样品沿磁场方向收缩，表明c轴是Fe-31.2Pd的难磁化轴，而Fe-3 Pt样品是易磁化轴。通过磁场的变体的转化对于Fe-31.2Pd几乎是完美的，而对于Fe 3 Pt不是完美的。Fe-31.2Pd和Fe_3 Pt在磁场去除过程中的可恢复应变分别为0.6%和0.6%。在3.2MA/m磁场下冷却过程中，优先级分数随磁场强度的增加而增加。
Magnetic field-induced strain (MFIS) along the [001]P (the symbol “P” represents parent phase) direction due to the conversion of martensite variants has been investigated for a disordered Fe–31.2Pd(at. %) single crystal and an ordered Fe3Pt single crystal exhibiting martensitic transformations from cubic phases to tetragonal phases at 85 and 230 K, respectively. The tetragonality c/a of Fe–31.2Pd at 77 K is 0.940 and that of Fe3Pt at 14 K is 0.945. When magnetic field is applied to the martensite phase along the [001]P direction, the specimen expands along the field direction for Fe–31.2Pd and contracts for Fe3Pt, suggesting that the c axis is the hard axis of magnetizaion for Fe–31.2Pd and is the easy axis for Fe3Pt. The conversion of variants by magnetic field is almost perfect for Fe–31.2Pd and is not perfect for Fe3Pt. The recoverable strain in the field removing process is small for Fe–31.2Pd and is about 0.6% for Fe3Pt. In the cooling process under magnetic field of 3.2 MA/m, the fraction of prefer...