不同热处理制度下Fe-Ga合金的相组成和晶体结构
毕业论文关键词：磁致伸缩，Fe-Ga合金，热处理，相结构，薄带合金。
Title Phase and microstructure of Fe-Ga alloy under different heat treatment
Abstract Fe-Ga alloy is a new kind of magnetostrictive material with high strength, great magnetostriction, high magnetomechanical coefficients, which has many applications in areas such as artificial intelligence, automobiles, sensors, and so on, though there are still some debate on the origin of the great magnetostriction. In this paper, we review the basic principle, research and applications of magnetostrictive materials. Then we prepare some Fe-Ga ribbons using arc melting method with different components of 13at%, 15at%, 19at%, 21 at% respectively and different heat treatment. We measure their magnetostriction. We examine the XRD pattern and deduce their microstructure from it. The main results are as follows. The microstructure and magnetostriction differ with different Ga components and heat treatment. Usually alloys with Ga content of about 19 at% have higher magnetostriction. A2 and D03 phase are the majority in the Fe-Ga alloy when Ga content is low or when temperature drops down rapidly. In slow cooling there occurs the L12 phase which has negative impact on magnetostriction. Crystal grains have a preferential orientation in the direction of [100] along the plane of Fe-Ga ribbons.
Keywords: magnetostriction, Fe-Ga alloy, heat treatment, microstructure, ribbon.
目次
第一章绪论
1.1引言.1
1.2基础知识.1
1.2.1磁致伸缩效应..1
1.2.2Fe-Ga合金的制备4
1.2.3Fe-Ga合金的相结构及热处理对相结构的影响6
1.3磁致伸缩材料的研究进展...13
1.4应用...14
第二章样品制备及测量方法
2.1Fe-Ga薄带合金的制备及热处理.16
2.2磁致伸缩的测量...18
2.3X射线衍射分析.19
第三章数据测量及分析
3.1XRD图谱...21
3.2磁致伸缩...26
结论..31
致谢..32
参考文献..33
第一章 绪论 1．1 引言 随着科技与社会经济的不断发展，各种新型的拥有奇特功能的新材料不断涌现，并且新材料反过来在各领域促进社会的进步，材料科学的水平已经成为衡量各国工业水平的重要标志，也是各国在未来优先发展的重要研究领域之一。 新材料在成分，结构，组织形态等方面与传统材料有所不同。其中新型磁性材料的研究是在应用方面最为重要的领域之一。磁性材料在现代工业中无处不在，小到移动存储器大到自动化机械，从通讯器材到人工智能，磁性材料已经成为国民经济和人类社会重要的基础材料。 磁致伸缩现象的发现可以追溯到 19 世纪，它是指材料在磁场作用下发生形变，同时在外应力作用下又在周围产生磁场的现象。但磁致伸缩材料直到 20 世纪中后期才开始蓬勃发展，其原因在于之前研究的材料磁致伸缩效应较小，难以实际应用，直到20世纪70年代后才陆续发展出了一批磁致伸缩系数大的新型材料。磁致伸缩材料被发现具有巨大的开发价值。此后人们一直沿着这一方向制造性能更加强大的功能材料，磁致伸缩效应如今已成为研究的热点。 1.2 基础知识 1.2.1 磁致伸缩效应 磁致伸缩效应又称焦耳效应，是 1842年由著名科学家 Joule发现的，它是指磁性材料在磁化状态改变时，长度和体积发生变化的现象，