Preparation of flake-shaped Fe-based nanocrystalline soft magnetic alloy particles subjected to plastic deformation

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Philosophical Magazine Letters Pub Date : 2021-07-19 DOI:10.1080/09500839.2021.1953713

S. Motozuka, H. Sato, H. Kuwata, Mitsuo Bito, Y. Okazaki

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引用次数: 4

Abstract

ABSTRACT Fe-based nanocrystalline alloy powder prepared by ball-milling is a potential candidate as a soft magnetic composite (SMC). Since the magnetic properties of particles having a random geometry arising from brittle fracture deteriorate by the presence of a demagnetising field, plastically deformed flake-shaped powders, exhibiting better magnetic properties on account of the suppression of any demagnetising field, are desirable. Microstructure such as grain size, lattice distortion and the distribution of dislocations, are affected by ball-milling treatment which changes the magnetic properties. In this study, Fe-based nanocrystalline alloy sheets are ball-milled with lubricant oil as a process control agent (PCA) and the microstructure of the particles investigated. The PCA effectively suppresses the brittle fracture of the alloy sheet during the ball-milling treatment and plastically deformed flake-shaped particles are then successfully obtained. Transmission electron microscopy reveals that there were few lattice defects in the α-Fe grain of the alloy, which indicated that almost only grain-boundary-mediated processes such as GB diffusion/sliding/migration and grain rotation dominate the deformation mechanism. However, Williamson–Hall analysis based on synchrotron radiation exhibits a slope indicating micro-strain in the α-Fe grains. It is found that the plastic deformation induced by the ball-milling treatment forms a microstructure having lattice distortion but containing few lattice defects. It is considered that a slight growth of the existing grains, which can be induced by thermal treatment, can achieve a strain- and dislocation-free microstructure, which is desirable for soft magnetic alloys.

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片状铁基纳米晶软磁合金塑性变形颗粒的制备

摘要球磨法制备的铁基纳米晶合金粉末是一种潜在的软磁复合材料。由于由脆性断裂引起的具有随机几何形状的颗粒的磁性能由于退磁场的存在而劣化，因此塑性变形的片状粉末由于抑制任何退磁场而表现出更好的磁性能是合乎需要的。球磨处理改变了磁性能，影响了晶粒尺寸、晶格畸变和位错分布等微观结构。在本研究中，以润滑油为过程控制剂（PCA）对铁基纳米晶合金片进行了球磨，并研究了颗粒的微观结构。PCA有效地抑制了合金板在球磨处理过程中的脆性断裂，从而成功地获得了塑性变形的片状颗粒。透射电子显微镜显示，合金的α-Fe晶粒中几乎没有晶格缺陷，这表明几乎只有晶界介导的过程，如GB扩散/滑动/迁移和晶粒旋转，才主导了变形机制。然而，基于同步辐射的Williamson–Hall分析显示出一个斜率，表明α-Fe晶粒中存在微应变。研究发现，球磨处理引起的塑性变形形成了具有晶格畸变但含有少量晶格缺陷的微观结构。人们认为，可以通过热处理诱导现有晶粒的轻微生长，可以实现无应变和无位错的微观结构，这对于软磁合金来说是可取的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Philosophical Magazine Letters 物理-物理：凝聚态物理

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Philosophical Magazine Letters is the rapid communications part of the highly respected Philosophical Magazine, which was first published in 1798. Its Editors consider for publication short and timely contributions in the field of condensed matter describing original results, theories and concepts relating to the structure and properties of crystalline materials, ceramics, polymers, glasses, amorphous films, composites and soft matter. Articles emphasizing experimental, theoretical and modelling studies on solids, especially those that interpret behaviour on a microscopic, atomic or electronic scale, are particularly appropriate. Manuscripts are considered on the strict condition that they have been submitted only to Philosophical Magazine Letters , that they have not been published already, and that they are not under consideration for publication elsewhere.