中文摘要：

制备了不同Tb含量的多晶Ni-Mn-Ga合金,利用SEM观察了合金的微观组织、第二相形貌;用EDAX对第二相化学成分进行了定性、定量分析。研究了稀土元素Tb的存在状态对合金的磁感生应变影响。结果表明:稀土极小部分固溶在基体中,主要以第二相的形式少量在晶内析出,大量在晶界处富集。当少量稀土Tb以第二相弥散分布在晶内时,可提高合金的磁感生应变。

英文摘要：

Ni2MnGa alloys containing different contents of Tb were prepared.Phase analysis,microstructure and morphology of second phases were investigated by XRD,SEM.The component of second phases was analyzed by EDAX.The magnetic-field-induced strains of polycrystalline Ni2MnGaTb alloys containing Tb were studied.The results show that,small amount of Tb resolves in based solid solution.Some Tb element accumulates along the grain boundaries with the discontinuous networks and other Tb element distribute inner the gra...