Effect of hydrogen pressure on hydrogenation and pulverization behavior of Sm(CoFeCuZr)z ingot and strip casting flake

被引：11

作者：

Yang, Jianjun ^{[1
,2
]}

Zhang, Dongtao ^{[1
]}

Zhang, Hongguo ^{[1
]}

Shang, Zhifeng ^{[1
]}

Wang, Hong ^{[1
]}

Meng, Chengzhen ^{[1
]}

Liu, Weiqiang ^{[1
]}

Yue, Ming ^{[1
]}

机构：

[1] Beijing Univ Technol, Fac Mat & Mfg, Key Lab Adv Funct Mat, Minist Educ China, Beijing 100124, Peoples R China

[2] Anyang Inst Technol, Sch Mech Engn, Anyang 455000, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2023年 / 930卷

基金：

中国国家自然科学基金;

关键词：

Sm(CoFeCuZr)z magnets; Hydrogen pressure; Hydrogenation behavior; Pulverization behavior; Hydrogenation mechanism; Alignment characteristics; DECREPITATION; MAGNETS; NANOSTRUCTURES; COMBINATION;

D O I：

10.1016/j.jallcom.2022.167427

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Effect of hydrogen pressure on hydrogenation and pulverization behavior of Sm(CoFeCuZr)7.6 alloy prepared by plate mold (PM) and strip casting (SC) has been systematically investigated. Increasing hydrogen pres-sure can improve the hydrogenation ability. Both the PM and SC have the similar hydrogen absorption process, which can be divided into two stages. The first stage follows the Sieverts' law (1-5 MPa) while the second one deviates from the Sieverts' law (5-10 MPa). Rietveld refinement shows that the hydrogen ab-sorption causes different lattice distortion of different phases without changing the phase structure. The internal stress caused by such lattice distortion is the primary reason that accelerates the pulverization of the alloys, and increasing hydrogen pressure can lead to the decrease of particle size of the PM and SC alloys. The hydrogen decrepitation (HD) process are studied in detail based on these results. The hydrogen ab-sorption mechanism of Sm(CoFeCuZr)7.6 alloy can be regarded as a hydrogen dissolution process without phase transformation. In addition, the existence of a large amount of fine grains in the SC has an adverse effect on the alignment, which can be optimized by taking effective methods to reduce the overcooling rate. This work proves that the SC, HD and jet milling process can be a promising new approach to powder preparation for high-performance Sm(CoFeCuZr)z sintered magnets.(c) 2022 Elsevier B.V. All rights reserved.

引用

页数：8

共 31 条

[1] Effect of sintering in a hydrogen atmosphere on the density and coercivity of (Sm,Zr)(Co,Cu,Fe)z permanent magnets [J].