Magnetic shielding promotion via the control of magnetic anisotropy and thermal Post processing in laser powder bed fusion processed NiFeMo-based soft magnet
Magnetic shielding promotion via the control of magnetic anisotropy and thermal Post processing in laser powder bed fusion processed NiFeMo-based soft magnet
复制标题
通过激光粉末床熔融加工 NiFeMo 基软磁体中磁各向异性和热后处理的控制来促进磁屏蔽
DOI：
10.1016/j.addma.2020.101079
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发表时间：
2020
影响因子：
11
通讯作者：
Mohamed A
中科院分区：
文献类型：
--
作者：
Mohamed A
本研究的目的是提高激光粉末床熔融（LPBF）处理的NiFeMo合金的磁屏蔽性能。这是通过控制构造的晶体学织构以增加沿磁化的易磁化轴沿着的颗粒群以及使用后处理氢热处理（HT）和热等静压（HIP）工艺来实现的。由于结晶取向/自旋序沿[100]磁化难轴沿着排列，所制造的微结构通常表现出弱磁性，[100]磁化难轴平行于构建方向，因为它也是立方材料固化期间的优选生长方向。倾斜构建取向以使易磁化轴[110]和[111]沿着构建主方向对准导致垂直于和横向于构建主方向的磁屏蔽特性的改善。此外，HT/HIP工艺进一步促进了软铁磁特性，在HIP和HT之后，[111]倾斜样品的磁屏蔽性能最好，与制造条件相比提高了60-100倍。HIP + HT后铁磁性的改善是由于几种综合效应，包括应力消除、气孔固结、再结晶和晶粒生长。后处理顺序（HT + HIP与HIP + HT）似乎会影响所得的磁特性。最后，对构建的拉伸性能进行了表征，以确保功能和机械行为都能达到所需的性能。
The aim of this study is to promote the magnetic shielding characteristics of laser powder bed fusion (LPBF) processed NiFeMo alloy. This was achieved via controlling the crystallographic texture of the builds to increase the grain population along the easy axis of magnetisation, as well as the use of post-process hydrogen heat treatment (HT) and hot isostatic pressing (HIP) processes. The as-fabricated microstructure typically demonstrates weak magnetic properties due to the alignment of the crystallographic orientation/spin order along the [100] hard axis of magnetisation, which is parallel to the build direction since it is also the preferred growth direction during solidification in cubic materials. Tilting the build orientation to align the easy magnetisation axes [110] and [111] along the build principal directions results in an improvement in the magnetic shielding characteristics normal and transverse to the build principal directions. Furthermore, the HT/HIP processes further promoted the soft ferromagnetic characteristics, with the best magnetic shielding properties being registered for the [111] tilted sample following both HIP and HT, demonstrating 60–100 folds improvement compared with the as-fabricated condition. The improved ferromagnetism following HIP + HT was due to several combined effects, including stress relief, consolidation of gas pores, recrystallisation, and grain growth. The post-processing sequence (HT + HIP vs. HIP + HT) appeared to affect the resulting magnetic characteristics. Finally, the tensile properties for the builds were characterised to ensure that both functional and mechanical behaviours would achieve the required performance.
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影响因子：
6.2
作者：
Gupta, Kiran;Raina, K. K.;Sinha, S. K.
通讯作者：
Sinha, S. K.
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DOI：
--
发表时间：
1997
期刊：
影响因子：
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作者：
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DOI：
--
发表时间：
2015
期刊：
Russian metallurgy. Metally
影响因子：
--
作者：
Yu. I. Ustinovshchikov;I. Shabanova;N. V. Lomova
通讯作者：
N. V. Lomova
影响因子：
6
作者：
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通讯作者：
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DOI：
--
发表时间：
1970
期刊：
影响因子：
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作者：
W. Kehr
通讯作者：
W. Kehr