Influence of RE-rich phase distribution in initial alloy on anisotropy of HDDR powders

doi:10.1088/1674-1056/24/9/097505

Abstract The influence of the RE-rich phase distribution in the precursor alloys on the anisotropy of the hydrogenation disproportionation desorption recombination (HDDR) processed powders is investigated. The homogenized ingot alloy and the as-cast strip casting (SC) alloy with a uniform RE-rich grain boundary phase lead to high anisotropy of the refined powders, acquiring degrees of alignment (DOA) of 0.62 and 0.54, respectively. The RE-rich phase aggregation results in a deteriorated DOA of the powders due to the drastic disproportionation rate, while a thin and uniform RE-rich phase distribution is beneficial for DOA. A reaction model of the initial particle microstructure is proposed for optimizing the HDDR powder anisotropy.

Keywords: hydrogenation disproportionation desorption recombination (HDDR) anisotropy RE-rich phase initial microstructure

Received: 09 January 2015
Revised: 22 April 2015
Accepted manuscript online:

PACS:	75.50.Ww	(Permanent magnets)
	75.50.Vv	(High coercivity materials)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 51101167), the Ningbo Natural Science Foundation, China (Grant No. 2013A610075), the Ningbo Science and Technology Project, China (Grant No. 2013B10004), the Program of International Science and Technology Cooperation of China (Grant No. 2010DFB53770), the China Postdoctoral Science Foundation (Grant No. 2012M520943), the State Key Program of the National Natural Science Foundation of China (Grant No. 2011AA03A401), and the National Key Technologies R&D Program of China (Grant No. 2012BAE01B03).

Corresponding Authors: Yan A-Ru
E-mail: aruyan@nimte.ac.cn

Cite this article:

Cai Ling-Wen (蔡岭文), Guo Shuai (郭帅), Ding Guang-Fei (丁广飞), Chen Ren-Jie (陈仁杰), Liu Jian (刘剑), Lee Don (李东), Yan A-Ru (闫阿儒) Influence of RE-rich phase distribution in initial alloy on anisotropy of HDDR powders 2015 Chin. Phys. B 24 097505

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Influence of RE-rich phase distribution in initial alloy on anisotropy of HDDR powders

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