Shen Bao-gen, Yang Lin-yuan, Zhang Jun-xian, Zhao Jian-gao
{"title":"Influence of quenching rate and heat treatment on the magnetic properties and phase components of rapidly quenched Fe77.5Nd4B18.5 alloy","authors":"Shen Bao-gen, Yang Lin-yuan, Zhang Jun-xian, Zhao Jian-gao","doi":"10.1016/0022-5088(91)90004-N","DOIUrl":null,"url":null,"abstract":"<div><p>The magnetic properties and phase components of rapidly quenched Fe<sub>77.5</sub>Nd<sub>4</sub>B<sub>18.5</sub> alloy as a function of quenching rate and heat treatment were studied. X-ray diffraction and thermomagnetic measurements show that the Fe<sub>77.5</sub>Nd<sub>4</sub>B<sub>18.5</sub> ingot consists of Nd<sub>2</sub>Fe<sub>14</sub>B, Fe<sub>2</sub>B and α-Fe. The X-ray diffraction patterns of optimally annealed samples show only metastable Fe<sub>3</sub>B phase which decomposes into Fe<sub>2</sub>B and α-Fe at <em>T</em><sub><em>a</em></sub> > 850 °C, but the thermomagnetic curves show the presence of the Nd<sub>2</sub>Fe<sub>14</sub>B phase. In the sample annealed at 950 °C for 60 min, Nd<sub>1.1</sub>Fe<sub>4</sub>B<sub>4</sub> appears in coexistence with Nd<sub>2</sub>Fe<sub>14</sub>B, Fe<sub>2</sub>B and α-Fe. The Fe<sub>77.5</sub>Nd<sub>4</sub>B<sub>18.5</sub> alloy is found to have very good glass-forming ability. Samples prepared at quenching rates <em>v</em><sub><em>s</em></sub> ⩾ 6.6 m s<sup>−1</sup> are amorphous and magnetically soft. Annealing at about 650–670 °C gives the highest coercive field, which is nearly independent of quenching rate.</p></div>","PeriodicalId":17534,"journal":{"name":"Journal of The Less Common Metals","volume":"175 2","pages":"Pages 199-204"},"PeriodicalIF":0.0000,"publicationDate":"1991-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0022-5088(91)90004-N","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of The Less Common Metals","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/002250889190004N","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
Abstract
The magnetic properties and phase components of rapidly quenched Fe77.5Nd4B18.5 alloy as a function of quenching rate and heat treatment were studied. X-ray diffraction and thermomagnetic measurements show that the Fe77.5Nd4B18.5 ingot consists of Nd2Fe14B, Fe2B and α-Fe. The X-ray diffraction patterns of optimally annealed samples show only metastable Fe3B phase which decomposes into Fe2B and α-Fe at Ta > 850 °C, but the thermomagnetic curves show the presence of the Nd2Fe14B phase. In the sample annealed at 950 °C for 60 min, Nd1.1Fe4B4 appears in coexistence with Nd2Fe14B, Fe2B and α-Fe. The Fe77.5Nd4B18.5 alloy is found to have very good glass-forming ability. Samples prepared at quenching rates vs ⩾ 6.6 m s−1 are amorphous and magnetically soft. Annealing at about 650–670 °C gives the highest coercive field, which is nearly independent of quenching rate.
研究了快速淬火Fe77.5Nd4B18.5合金的磁性能和相组成随淬火速度和热处理的变化。X射线衍射和热磁测量表明,Fe77.5Nd4B18.5铸锭由Nd2Fe14B、Fe2B和α-Fe组成。最佳退火样品的X射线衍射图仅显示亚稳的Fe3B相,其在Ta>;850°C,但热磁曲线显示Nd2Fe14B相的存在。在950°C退火60min的样品中,Nd1.1Fe4B4与Nd2Fe14B、Fe2B和α-Fe共存。发现Fe77.5Nd4B18.5合金具有很好的玻璃形成能力。在淬火速率vs⩾6.6 m s−1下制备的样品是无定形的且磁软的。在约650–670°C下退火可产生最高的矫顽场,这几乎与淬火速率无关。