Journal of Magnetism and Magnetic Materials
The phase transformation, structure and magnetic properties of mechanically alloyed (MA) Pr10Fe82-xVxB8, Pr10Fe76V6+yB8-y, and Pr10-zNdzFe76V13B1 alloys and their nitrides have been studied. With increasing V content, the magnetic main phase in the Pr10Fe76V6+yB8-y series changes from the Pr2Fe14B-type phase via a metastable Pr(Fe,V, B)(7) phase with TbCu7-type structure to Pr(Fe,V, B)(12) phase with ThMn12-type structure. After nitrogenation, the easy magnetization of Pr(Fe,V, B)(7) and Pr(Fe,V, B)(12) phases changes from easy in-plane to easy c-axis, and their Curie temperatures are greatly enhanced, due to the entrance of nitrogen into the interstitial sites. In the Pr10-zNdzFe76V13B1 series, the substitution of Nd for Pr gradually leads to the complete formation of (Pr, Nd)(Fe,V, B)(12) phase with ThMn12-type structure and the disappearance of alpha-Fe. The coercivity of the Pr10-zNdzFe76V13B1Ndelta alloys is drastically enhanced by Nd substitution. (C) 2003 Elsevier B.V. All rights reserved.
关键词:
permanent magnets;magnetic anisotropy;magnetic properties;remanence enhancement;fe
Journal of Magnetism and Magnetic Materials
The structure and magnetic properties of mechanically alloyed (MA) Nd10Fe76B8-xV6+x series and their nitrides have been studied. With increasing V content, the magnetic main phase of Nd10Fe76B8-xV6+x series changes from the magnetic phase of Nd2Fe14B-type structure via a metastable Nd(Fe,V)(7) phase with TbCu7 structure to Nd(Fe,V)(12) phase with ThMn12 structure, The easy in-plane magnetization of Nd(Fe,V)(7) and Nd(Fe,V)(12) phases results in rather poor permanent magnetic properties. The V-containing Nd2Fe14B-type phase is partly decomposed upon nitrogenation. Because nitrogen enters into the interstitial sites of the TbCu7-type and ThMn12-type structures, their Curie temperatures are greatly enhanced. The easy magnetization of Nd(Fe,V)(7) with TbCu7, like Nd(Fe,V)(12) with ThMn12 structure, changes from easy in-plane to easy c-axis after nitrogenation. (C) 2000 Elsevier Science B.V. All rights reserved.
关键词:
phase transformation;magnetic properties;structure;mechanical;alloying;nitrides;coercivity
黄拓
,
马忠伟
,
任金朝
,
王明林
,
张慧
钢铁钒钛
doi:10.7513/j.issn.1004-7638.2014.06.021
以国内某钢厂82B方坯连铸坯为研究对象,观察V型偏析在横、纵截面上的分布,并研究碳元素的中心偏析现象.结果表明:V型偏析产生于中心等轴晶区,在纵向上表现为多个V字上下嵌套、交织在一起,横向上表现为一组同心圆结构;通道区内碳元素偏析严重,是影响82B高碳钢线材质量的重要原因;V型偏析的产生与富集溶质液相的流动以及凝固组织有关,扩大等轴晶区、细化等轴晶粒有助于减轻V型偏析.
关键词:
82B连铸坯
,
V型偏析
,
等轴晶
王勇围
,
桂美文
,
周勇
,
马党参
,
董瀚
材料热处理学报
研究了V和V、N微合金化高碳钢82B固溶加热连续冷却和高温热变形连续冷却后的强韧性.结果表明,固溶加热连续冷却后,82B钢随钒含量的增加,强度增加、塑性降低,塑性主要受索氏体片层间距的影响.经高温热变形连续冷却后,与未热变形的相比,试验钢的强度和塑性均显著提高,索氏体团显著细化,钒氮同时加的82B钢强韧性最高,热变形连续冷却后性能提高的因为主要是索氏体团的细化和V(CN)的形变诱导析出.
关键词:
高碳钢82B
,
钒氮微合金化
,
热变形
,
索氏体团
刘政军
,
张桂清
,
刘铎
,
李永奎
,
尹奕君
,
谢宇
表面技术
doi:10.3969/j.issn.1001-3660.2006.05.002
采用碳弧堆焊方法,通过堆焊层中合金元素的设计,成功研制了一种适用于抗磨料磨损条件下的堆焊合金,合金系统为Cr-B-Ni-W-V.该堆焊合金的抗磨料磨损性能很优异.系统地研究了Cr、B、W、V等合金元素提高堆焊层抗磨料磨损的能力及其对堆焊层组织性能的影响规律和耐磨机理,并最终确定了各合金元素的最佳质量分数.
关键词:
磨料磨损
,
碳弧
,
堆焊合金
,
堆焊
倪建森
,
徐晖
,
朱明原
,
李强
,
周邦新
,
张迅
,
贾积晓
金属功能材料
doi:10.3969/j.issn.1005-8192.2002.06.003
快淬速度18m@s-1的Nd11Fe72Co8V1.5B7.5薄片经650℃×4min晶化处理后,晶粒尺寸约100nm,该快淬薄片经600℃×4min晶化处理后制成的粘结磁体的磁性能:Br=0.66T,JHc=780kA@m-1,(BH)max=69kJ@m-3.
关键词:
Nd-Fe-B
,
粘结磁体
,
磁性能
唐莒平
,
陈业新
上海金属
研究了室温下σ相对不同硼含量有序态(Fe,Ni)3 V-B合金在真空中力学性能的作用,研究结果表明:随着合金中硼含量的增加,有序态(Fe,Ni)3 V-B合金的晶粒尺寸变小;合金中σ相的含量随之增加;有序态(Fe,Ni)3 V-B合金的延伸率基本保持恒定,而合金的抗拉强度却呈增加的趋势.含σ相有序态(Fe,Ni)3 V-B合金在真空中的力学性能受合金中的硼含量、σ相的含量及其分布的共同影响.
关键词:
σ相
,
(Fe,Ni)3V-B合金
,
力学性能
,
硼含量
王治
,
何开元
,
尹君
,
张玉梅
,
张洛
,
梁志德
金属学报
研究了不同温度（530—620℃）退火后的Fe72．7Cu1Nb2V1．8Si13．5B9纳米晶合金初始磁导率μi与温度T的关系（μi-T曲线）．实验结果表明，退火温度Ta对μi－T曲线的形状有较大的影响．根据Ta可将μi－T曲线划分为三种类型，其对应的退火温度分别为（1）Ta=530—550℃，（2）Ta=560—590℃，（3）Ta600℃．分析了这三种类型的μi－T曲线对应的合金相结构，讨论了双相纳米晶合金中晶体相的晶粒尺寸、体积百分数及剩余非晶相的磁特性对μi-T曲线形状的影响．
关键词:
Fe-Cu-Nb-V-Si-B合金
,
null
,
null
Chunyan BAN
,
Wenqing GAO
,
Guiyi ZENG
,
Qixian BA
,
Hualin ZENG
材料科学技术（英文）
The magnetic properties of Fe72.5Cu1Nb2V2Si13.5B9 alloy are investigated from an amorphous to a nanocrystalline and complete crystalline state. The sample annealed at 550℃ for 0.5 h shows a homogeneous nanocrystalline structure and presents excellent soft magnetic properties. When the specimens were annealed at a temperature above 600℃, the magnetic properties are obviously deteriorated because the grain size grows up, exceeding the exchange length.
关键词:
Fe72.5Cu1Nb2V2Si13.5B9 alloy
,
null
,
null
,
null
