Controlling the grain orientation during laser powder bed fusion to tailor the magnetic characteristics in a Ni-Fe based soft magnet
Controlling the grain orientation during laser powder bed fusion to tailor the magnetic characteristics in a Ni-Fe based soft magnet
复制标题
控制激光粉末床熔合过程中的晶粒取向，以定制镍铁基软磁体的磁特性
DOI：
10.1016/j.actamat.2018.07.064
复制
发表时间：
2018
期刊：
影响因子：
9.4
通讯作者：
Zou J
中科院分区：
文献类型：
--
作者：
Zou J
<100>是立方金属凝固过程中有利的晶体生长方向。然而，对于富镍软磁材料，它是硬磁化轴。在这项工作中，一种策略，以提高磁屏蔽特性的激光粉末床处理的软磁合金（坡莫合金-80）通过控制的晶体织构的发展。该策略涉及最初评估工艺参数对致密构建中（001）取向发展的影响，然后倾斜构建取向以实现沿着磁化软轴的晶体取向。使用这种方法，生产出具有预期（001）织构的致密立方体样品，并使开裂密度最小化。之后，通过X射线衍射和电子背散射衍射证实，制造了倾斜以实现（111）和（110）织构的立方样品。与（100）取向构造相比，在（111）织构构造中发现磁化率提高超过200倍。本文强调了在激光粉末床处理过程中控制晶粒取向以实现改善磁性能的可能性。
<100> is the favoured crystal growth direction during solidification of cubic metals. However, it is the hard magnetisation axis for Ni-rich soft magnetic materials. In this work, a strategy to enhance the magnetic shielding characteristics of laser powder bed processed soft magnetic alloy (permalloy-80) through the control of the crystallographic texture was developed. The strategy involves initially assessing the influence of the process parameters on the development of the (001) orientation within dense builds, then tilting the build orientation to achieve a crystallographic orientation along the magnetisation soft axis. Using this approach, dense cubic samples with the expected (001) texture were produced, with minimised cracking density. Thereafter, cubic samples tilted to achieve (111) and (110) textures were fabricated, as confirmed by X-ray diffraction and electron backscattered diffraction. Over 200 folds improvement in the magnetic susceptibility was found in the (111) textured build, compared with the (100) oriented build. The paper highlights the possibility to control the grain orientations to achieve improved magnetic properties in the build during laser powder bed processing.