论文标题
基于NI2MNGA的巨型磁场诱导的菌株
Giant Magnetic-Field-Induced Strain in Ni2MnGa-based polycrystal
论文作者
论文摘要
基于智能执行器，磁制冷和机器人技术等技术领域，基于NI2MNGA的合金在技术领域起着重要作用。获得外部扰动引起的大型非接触变形的可能性是其应用的关键优势之一。但是，寻找低成本，实际制造程序和小信号输出的材料仍然带来挑战。在本研究中，我们证明，通过在MN站点上的司法选择，从磁磁性奥氏体相位到铁磁性马氏体的突然磁结构过渡可以调节以接近室温，可实现较大且可再现的菌株。诱导应变的所需磁场因小值而变化，在297.4 K和1.6％的应变中低至0.25 t，到305 K和菌株的2.6％。我们的发现表明，在相对廉价，可扩展的多晶材料中应用形状记忆合金的可能性。
Ferromagnetic Ni2MnGa-based alloys play an important role in technological fields, such as smart actuators, magnetic refrigeration and robotics. The possibility of obtaining large non-contact deformation induced by an external perturbation is one of its key strengths for applications. However, the search for materials with low cost, practical fabrication procedures and large signal output under small perturbing fields still poses challenges. In the present study we demonstrate that by judicial choice of substitution on the Mn site, an abrupt magnetostructural transition from a paramagnetic austenite phase to a ferromagnetic martensite one can be tuned to close to room temperature achieving large and reproducible strains. The required magnetic field to induce the strain varies from small values, as low as 0.25 T for 297.4 K and 1.6% of strain, to 8 T for 305 K and 2.6% of strain. Our findings point to encouraging possibilities for application of shape memory alloys in relatively inexpensive, scalable polycrystalline materials.
