论文部分内容阅读
铁磁形状记忆合金兼具大输出应变与高响应频率等综合特性,是新一代驱动与传感材料。采用定向凝固技术制成的多晶铁磁形状记忆合金具有较多优越的力学性能。本文对温度和应力耦合作用下的定向凝固多晶铁磁形状记忆合金的力学特性进行了实验测试,分别获得了定向凝固多晶Ni-Mn-Ga试样在不同恒定温度时的应力-应变循环曲线,以及试样在压缩时两个互相垂直方向的数字散斑图。结果表明:同一恒定温度时,随着应力循环次数的增加,其应变值逐渐减小;同一压缩应力时,不同温度作用过程中定向凝固方向的应力,随着温度的升高逐渐减小。本文结果可为铁磁形状记忆合金在工程中的应用提供一定的指导作用。
Ferromagnetic shape memory alloy with large output strain and high response frequency and other comprehensive features, is a new generation of drive and sensing materials. Polycrystalline ferromagnetic shape memory alloy made by directional solidification technology has more superior mechanical properties. In this paper, the mechanical properties of the directionally solidified polycrystalline ferromagnetic shape memory alloy under the coupling of temperature and stress were experimentally tested, and the stress-strain cycles of the polycrystalline Ni-Mn-Ga sample at different temperatures were obtained respectively Curve, and the sample in the compression of two perpendicular to each other digital speckle pattern. The results show that at the same constant temperature, the strain decreases with the increase of stress cycles. The stress in the direction of directional solidification decreases with the increase of temperature under the same compressive stress. The results of this paper can provide some guidance for the application of ferromagnetic shape memory alloys in engineering.