[1]司宇,刘俊,杨慧,等.MnCoSi基合金室温可逆大磁致伸缩效应[J].中国材料进展,2017,(9):011-15.
 Si Yu,Liu Jun,Yang Hui,et al.Large reversible magnetostrictive effect in MnCoSi-based alloys at room temperature[J].MATERIALS CHINA,2017,(9):011-15.
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MnCoSi基合金室温可逆大磁致伸缩效应()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2017年第9期
页码:
011-15
栏目:
特约研究论文
出版日期:
2017-09-30

文章信息/Info

Title:
Large reversible magnetostrictive effect in MnCoSi-based alloys at room temperature

作者:
 司宇刘俊杨慧龚元元徐锋
(南京理工大学材料科学与工程学院,江苏 南京 210094)
Author(s):
 Si YuLiu JunYang HuiGong YuanyuanXu Feng
 (School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China)
关键词:
磁致伸缩效应可逆三相临界点相变临界场
Keywords:
magnetostrictive effectreversibletricritical pointphase transition critical field
文献标志码:
A
摘要:
磁场诱导的相变是实现大磁致伸缩效应的一种有效途径。有别于传统磁致伸缩,该效应来源于相变过程伴随的晶格常数变化。然而,由于一级相变特征,磁致相变产生的磁致伸缩通常伴随较大的不可逆性,难以应用。本文将介绍一种特殊的磁相变合金MnCoSi。由于具有特殊的三相临界行为,MnCoSi合金有望在室温通过磁场诱导的二级相变实现可逆、低场的磁致伸缩效应。而上述效应的实现则依赖于合金三相临界行为的调控。通过调控,合金的三相点温度以及相变临界场降低,室温磁致伸缩效应源于磁场诱导的二级相变,可逆性提升。本文总结并介绍了调控机理以及部分调控方法,这些方法均能在相变临界场降低的前提下,实现室温可逆且较大的磁致伸缩效应。基于三相临界行为的调控,MnCoSi基合金有望具有媲美于Terfenol-D的磁致伸缩效应,在传感器、声纳、制动器以及震动马达等领域具有潜在的应用价值。
Abstract:
It is found that the large magnetostrain can be obtained from the magnetic-field induced first-order transition in some magnetic-phase alloys. The magnetostrain is generated from the lattice parameter alteration during the transition, which is quite different from that in conventional magnetostrictive alloys, such as Terfenol-D. However, due to the first-order nature of the transition, the observed magnetostrain is accompanied by obvious irreversibility. To overcome this drawback, we indicate that large reversible magnetostriction can be fulfilled in MnCoSi-based alloys at room temperature. By tuning tricritical behavior, the temperature of tricritical point and the critical driving field can be reduced. Based on this improvement, the room-temperature magnetostriction is generated from low-field induced second-order transition in MnCoSi-based alloys, which is characterized as high reversibility. We also introduce the mechanism and method of tricritical-behavior-tuning. The magnetostrictive effect in MnCoSi-based alloys is comparable to Terfenol-D, indicating potential applications in sensor, actuator, magnetomechanical relays, etc.
更新日期/Last Update: 2017-08-16