Research and development of exchange spring magnet by means of micro-alloying technique

微合金化技术交换弹簧磁体的研制

• 批准号: 07555189
• 负责人: MATSUURA Makoto
• 金额: $ 2.94万
• 依托单位: MIYAGI NATIONAL COLLEGE OF THCNOLOGY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555189/
• 关键词: HDDR; Hydrogenation; magnetic anisotropy; Nd_2Fe_<14>B; fluorescence XAFS; dilute additives; local structure; 蛍光XAFS; マイクロアロイング; 結晶制御; スプリング磁石; 液体急冷; XAFS

The main purpose of this study is to reveal the roles of small amount of additives in the exchange spring magnets. Small additives sometimes drastically reduce grain size of crystallites in the crystallization from amorphous states. Here we have mainly investigated the changes of local structures of small additives by fluorescence XAFS during crystallization from amorphous states and during hydrogenation. It has been found that Ga in Fe_<73>Ga_4Nb_3Si_<11>B_9 moves toward interface of precipitated alpha-Fe at an early stage of crystallization, and then included into alpha-Fe with the crystallization being proceeded. We also studied the local structure changes of Ga and Zr in Nd_<13.6>Fe_<68.2>Co_<10.8>Ga_<1.0>Zr_<0.1>B_<6.9> before and after hydrogenation. Before hydrogenation Ga is included in Nd_2Fe_<14>B and after hydrogenation it moves into alpha-Fe. On the other hand Zr makes selective bonding to hydrogen and forms ZrH_2 after the hydrogenation.At the present stage how such behaviors of Ga and Zr in HDDR are related with the crystalline memory effects are not yet clear. Further investigations are needed to reveal it.

本研究的主要目的是揭示少量添加剂在交换弹簧磁体中的作用。在非晶态结晶过程中，少量添加剂有时会极大地减小微晶的尺寸。本文主要用荧光XAFS研究了小分子添加剂在非晶态晶化和氢化过程中的局域结构变化。结果表明，在晶化初期，Fe_(73)&Gt；Ga_4Nb_3Si_(11)&Gt；B_9中的Ga向析出的α-Fe界面移动，随着晶化的进行，Ga进入α-Fe。我们还研究了氢化前后Nd_&lt；13.6&gt；Fe_&lt；68.2&gt；Co_&lt；10.8&gt；Ga_&lt；1.0&gt；Zr_&lt；0.1&gt；B_&lt；6.9&gt；中Ga和Zr的局域结构变化。在氢化前，Ga主要存在于Nd2Fe；14&Gt；B中，氢化后进入α-Fe。另一方面，Zr与氢发生选择性键合，氢化后生成ZrH_2。目前，Ga、Zr在HDDR中的这种行为与晶体记忆效应之间的关系尚不清楚。需要进一步的调查才能揭示这一点。

项目成果

M.Matsuura: "Amorphous Fe clusters imbedded in FCC La for melt-quenched La-Fe" J.de Physique. (to be published). (1997)

M.Matsuura：“将非晶态 Fe 簇嵌入 FCC La 中，用于熔融淬火 La-Fe”J.de Physique。

M.Matsuura: "Behaviors of Ga during Crystallization of Amorphous Nd_<4.5>Fe_<73>Ga_1Co_3B_<18.5>" Physica. B208&209. 360-362 (1995)

M.Matsuura：“非晶态 Nd_<4.5>Fe_<73>Ga_1Co_3B_<18.5> 结晶过程中 Ga 的行为”物理学。

R.Imada: "Structure and giant magneto resistance effect of FeCoNi/Cu multilayer" J.Applied Physics. (to be published). (1997)

R.Imada：“FeCoNi/Cu多层结构和巨磁阻效应”J.应用物理学。

M.Matsuura: "On the role of small additives for nanocrystalline formatiopn from amorphous matrix" Materials Science and Engineering. A217/218. 397-400 (1996)

M.Matsuura：“论小添加剂对非晶基质纳米晶形成的作用”材料科学与工程。

M.Matsuura: "On the role of small additives for nanocrystalline formation from amorphous matrix" Materials Science and Engineering. A217/218. 397-400 (1996)

M.Matsuura：“关于小添加剂对非晶基质形成纳米晶体的作用”材料科学与工程。