共查询到18条相似文献,搜索用时 343 毫秒
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稀土巨磁致伸缩材料优良的特性和广阔的应用前景受到国内外材料及相关领域的专家和学者的重视,被誉为新一代的Smart材料.介绍了稀土巨磁致伸缩材料的特性和性能优势、应用及器件研究进展,展望了稀土巨磁致伸缩材料今后的研究方向和器件开发. 相似文献
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我国稀土超磁致伸缩材料的研究与应用现状 总被引:4,自引:0,他引:4
概述了稀土超磁致伸缩材料的性能特点和应用领域,介绍了材料的制备方法和工艺特点,着重讨论了我国稀土超磁致伸缩材料成分、工艺的研究进展及应用现状。 相似文献
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超磁致伸缩材料是一种先进的能量转换材料,在高新技术和国防军工领域具有重要的应用价值。在概述TbDyFe超磁致伸缩材料的特点及发展现状基础上,重点介绍了<110>取向材料的磁场热处理研究。在实验方面,采用区熔定向凝固技术制备了<110>取向TbDyFe多晶材料,在略高于居里点温度退火时施加磁场,不改变晶体学择优取向和凝固组织,但能调控初始磁畴分布状态,改变服役时的磁矩运动过程,从而改善材料磁致伸缩和力学性能。在模拟研究方面,建立了基于能量最低原理的磁畴旋转模型,模拟了磁热感生各向异性诱导的初始磁矩再取向过程,得到了形成单轴各向异性的临界值;模拟了感生各向异性强弱对磁致伸缩"Jump"效应的影响规律,探讨了磁场热处理对<110>取向晶体磁致伸缩的作用机理。 相似文献
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稀土超磁致伸缩换能器的研制及其在桥梁检测中的应用 总被引:1,自引:0,他引:1
稀土超磁致伸缩材料是在磁场的作用下能产生巨大伸缩变形的一种新型功能材料,它的应用越来越受到广泛的关注,针对目前大型工程质量检测对声波无损评价系统震源的新要求,研制了稀土超磁致伸缩换能器,该换能器以大功率稀土超磁致伸缩材料作能量转换部件,具有能量集中、发射声波传播距离远、发射频率适中,容易与采集系统集成而实现自动检测控制,显著提高工作效率.最后以某桥梁声波CT无损评价为例说明其广泛的应用。 相似文献
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文章介绍了磁致伸缩材料的最新研究方向,阐述了磁致伸缩换能器的应用及近年来所取得的最新成果,分析了磁致伸缩换能器与压电陶瓷换能器相比所具有的优点,展望了其未来发展趋势。 相似文献
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磁致伸缩可作为电磁能和机械能之间的高效转换途径,是基础研究以及技术应用等方面重要的材料性能.然而,在其微观成因的理解方面仍然存在挑战,这对磁致伸缩材料的发展非常重要.本文利用原位磁场和温度场下的粉末中子衍射技术首次揭示了自旋旋转对La(Fe,Al)13超磁致伸缩的关键作用. La(Fe,Al)13超磁致伸缩性能是由磁场驱动的倾斜结构磁矩旋转引起的,其中铁磁成分的急剧增加促使晶格内部二十面体伸长,进而产生巨大的磁致伸缩.此外,本文揭示了La(Fe,Al)13精确的倾斜磁结构特征.本研究提供了一种通过磁场诱导自旋旋转途径探索新型磁致伸缩功能材料的策略. 相似文献
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Shen Wang Zhi Bo Wang Hong Hui Liu Xu 《International Journal of Mechanics and Materials in Design》2020,16(4):685-691
International Journal of Mechanics and Materials in Design - A type of new intelligent micro-deformation material called giant magnetostrictive materials (GMMs) has a wide range of potential... 相似文献
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This paper presents some simulation results of nonlinear dynamic responses for a laminated composite beam embedded by actuators of the giant magnetostrictive material (Terfenol-D) subjected to external magnetic fields, where the giant magnetostrictive materials utilizing the realignment of magnetic moments in response to applied magnetic fields generate nonlinear strains and forces significantly larger than those generated by other smart materials. To utilize the full potential application of the materials in the function and safety designs, e.g., active control of vibrations, the analysis of dynamic responses is requested in the designs as accurately as possible on the basis of those inherent nonlineary constitutive relations among stain, force and applied magnetic field existed in the materials. Here, a numerical code for the nonlinear vibration of laminated beams is proposed on the basis of a nonlinearly coupling constitutive model which fully behaves for the characteristics what are measured in experiments. It is found from this code that the natural frequency of the laminated beams changes with both the bias magnetic field and the pre-stresses, and the dynamic responses excited by an alternating magnetic field of simple harmonic form display strong nonlinear characteristics, for example, the frequency multiplication and the ultraharmonic resonance phenomena. 相似文献
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磁场驱动频率高是限制超磁致伸缩薄膜器件推广应用的关键因素之一,研究如何降低超磁致伸缩薄膜器件的磁场驱动频率对超磁致伸缩薄膜器件的推广应用将具有重要意义。在深入分析超磁致伸缩薄膜存在各向异性根本原因的基础上,结合薄膜磁致伸缩过程中磁畴的运动机理,提出只要能够克服超磁致伸缩薄膜中存在的退磁场,低磁场驱动频率下就可在难磁化轴方向获得更为优良动态特性的新思路。通过建立超磁致伸缩薄膜难磁化轴实验系统进行实验研究,结果表明通过施加合适的偏置磁场克服退磁场,可以使薄膜在难磁化轴方向产生响应优良的超谐共振,为低频驱动GMF器件的研制提供了一种新的思路。 相似文献
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G. Balaji R. Aravinda NarayananA. Weber F. Mohammad C.S.S.R. Kumar 《Materials Science and Engineering: B》2012,177(1):14-18
Typically the value of the magnetostrictive coefficient (λ) observed for bulk magnetic materials such as cubic ferrites is 10−6. However, giant magnetostriction (λ ≤ 10−3) is only observed in a few bulk intermetallic materials based on alloys of rare earth and iron such as TbFe, TbFe2, DyFe2 and Terefenol-D. While giant magnetostriction is known in nanostructured films, we show for the first time, this phenomenon occurs in magnetic nanoparticles. By using in-field small angle X-ray scattering (SAXS) as a tool, we demonstrate that a 4% relative change in dimension of the particle can be observed in 5.0 nm Fe3O4 nanoparticles at room temperature with 1 kG magnetic field. Also, we propose that the observed values are due to interaction effects and magnetoelastic coupling of particle magnetic moments and external magnetic field. 相似文献
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Magnetic force control with composite of giant magnetostrictive and piezoelectric materials 总被引:2,自引:0,他引:2
We propose a new magnetic force control device, composed of a giant magnetostrictive material (Terfenol-D) and a piezoelectric material (PZT), for coilless magnetic force control. The device uses the inverse magnetostrictive effect, whereby the variation of magnetization of a Terfenol-D rod controlled by PZT is converted to the variation of magnetic force by a magnetic circuit. Because PZT is electrically capacitive, the method has the advantage of low power consumption and low heat generation in static operation. We have fabricated several devices with different geometrical shapes of the rods and magnetic yokes, and we describe their characteristics such as power consumption, heat generation, and response. We discuss a magnetic circuit design strategy that uses the /spl Delta/E effect in magnetostrictive materials to increase the energy conversion efficiency. 相似文献