Ni-Mn-X(X=In,Sn,Sb)铁磁形状记忆合金的中间相及相关物理性质研究

项目名称： Ni-Mn-X(X=In,Sn,Sb)铁磁形状记忆合金的中间相及相关物理性质研究

项目编号： No.51261022

项目类型： 地区科学基金项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 马胜灿

作者单位： 江西理工大学

项目金额： 52万元

中文摘要： Ni-Mn-Ga Heusler合金中间相（预马氏体相）以其丰富的物理内涵和潜在的应用前景受到广泛关注，其中强的磁弹耦合是中间相出现的主要原因。但在不含Ga的新型Ni-Mn-X (X=In,Sn,Sb)铁磁形状记忆合金中，中间相变却鲜有报道。研究发现，对Ni-Mn-Ga合金施加压力可以增大其磁弹耦合，使异常声子软化增强，有利于中间相的出现。因此本项目拟以新型Ni-Mn-X合金为研究对象，通过高压退火、退火后预压和退火后拉伸等手段对其施加压力，增强其磁弹耦合。前期预研结果表明，在施压后的新型Ni-Mn-X合金中观察到了中间相。我们将对中间相变规律，中间相表征和中间相变附近相关物理性质及潜在应用等进行研究。此外，根据Landau理论，在系统自由能中引入一项由压力所导致的磁弹耦合增强项，通过理论计算为理解Ni-Mn基铁磁形状记忆合金中间相变发生的物理机制和扩大其应用领域寻找实验和理论支持。

中文关键词： 磁性相变合金；相变调控；中间相；磁热效应；磁电阻

英文摘要： A considerable attention has been paid to the intermediate phase (Premartensitic Phase) of Ni-Mn-Ga ferromagnetic shape memory alloys due to its abundant physical contents and potential application prospect. It is widely believed that the intermediate phase transition originates mainly from the strong magnetoelastic coupling between the magnetic and the structural degrees of freedom in Ni-Mn-Ga alloy system. In Ga-free Ni-Mn-X (X=In,Sn,Sb) Heusler alloys, however, almost no investigations about the intermediate phase are carried out by far. It is reported that application of the uniaxial stress can enhance the magnetoelastic coupling and increase the softening of anomalous phonon in Ni-Mn-Ga alloys, which could facilitate the intermediate phase transition to occur. Therefore, we intend to take Ni-Mn-X(X=In,Sn,Sb) slloys with the appropriate composition as the subject investigated and exert pressure to them by high pressure annealing, pre-deforming after annealing, and pre-stretching after annealing, which is aim to enhance the magnetoelastic interaction of these alloys. Our previous research results indicate that the intermediate phase has been observed in the Ni-Mn-X alloys after pressuring. We will study the law of the intermediate phase transition, the representation of intermediate phase, and the related phy

英文关键词： Magnetic transition alloys；Control and regulation of magnetic transition；Intermediate phase；Magnetocaloric effect；Magnetoresistance