多晶Mn_(1-x) Cu_x (0.1≤x≤0.3)合金的磁诱发应变

Magnetic-field-induced strains in polycrystalline Mn_(1-x) Cu_x (0. 1≤x≤0. 3) alloys

采用X射线衍射分析、显微形貌观察、差示扫描量热法、标准电阻应变计法等实验方法,研究了室温下多晶Mn1-xCux(0.1≤x≤0.3,原子分数)合金在低磁场中的磁诱发应变性能.结果表明,Mn1-xCux合金经过长时间的固溶处理,在冷却过程中会出现fcc(γ)→fct(γ’)马氏体相变,形成(γ+γ’)两相组织;随着锰含量的升高,Mn1-xCux合金的fcc→fct马氏体相变程度更大,磁诱发应变性能更好.Mn0.9Cu0.1合金在室温和0.9T磁场中的磁诱发应变可达9.1×10-5.

Magnetic-field-induced strain（MFISs） in polycrystalline Mn1-x Cux （0.1 ≤ x ≤ 0.3,atomic fraction） alloys are studied by means of X-ray,photomicrograph,DSC,resistance strain gauge method at room temperature.The results show that Mn1-xCux alloys consist of fcc （γ） and fct （γ’） phases after a long period of homogenization because of fcc（γ）→fct （γ’） martensitic transformation in the cooling process.The volume proportion of γ’phase increases with the increase of Mn content,so that the samples possess much better MFIS performance.At room temperature,the MFIS in Mn0.9 Cu0.1 sample reaches 91 ppm in 0.9 T magnetic field.