Nd-Fe-B纳米双相组织的XRD表征【毕业设计】.doc

- PAGE I - （20 届） 本科毕业设计 Nd-Fe-B纳米双相组织的XRD表征 XRD characterizations of Nd-Fe-B nanocomposite structure 所在学院 专业班级 应用化学 学生姓名 学号 指导教师 职称 完成日期 年 月 Nd-Fe-B纳米双相组织的XRD表征 PAGE 16 PAGE 17 摘要 【摘要】：采用热压/热变形工艺制备纳米复合Nd9Fe84.5Co1B5.5永磁体，采用XRD表征磁体微观结构，利用MAUD软件计算分析得出XRD的表征：磁体的物相、晶格参数、晶格畸变量、磁体晶粒尺寸和微观应变量，结果表明，变形量从54% 升高到74%，纳米复合磁体Nd9Fe84.5Co1B5.5物相含量不变，双相晶胞参数都有所增加，晶格畸变量有所减小，平均晶粒尺寸明显减小，热变形变形量的增加有效地改善了磁体的微观结构。 【关键词】：纳米双相；热变形；晶粒尺寸；微观应变量 XRD characterizations of Nd-Fe-B nanocomposite structure [Abstract]：Nanocomposite Nd9Fe84.5Co1B5.5 magnets were prepared by hot pressed/die-upset process.Magnets microstructure was characterized by XRD.XRD characterizations were analysed by MAUD software, which are phase、cell parameters、lattice distortion、grain size and microstrain. The results show that the average grain size reduced significantly and the grain size of main phaze is effectively refined, with the increase of deformation ratio from 54% to 74% in nanocomposite Nd9Fe84.5Co1B5.5 magnets. Phase contents keep the same, and both two-phase cell parameters increased, the amount of lattice distortion decreased. And the grain size decreased obviously.So the microstructure is developmented by the increased height reduction ratio. [Keyword]：nanocomposite magnets；hot-deformation；grain size；microstrain。 目　录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc293080273 1 资料综述 PAGEREF _Toc293080273 \h 1 HYPERLINK \l _Toc293080274 1.1 稀土永磁材料发展历程 PAGEREF _Toc293080274 \h 1 HYPERLINK \l _Toc293080275 1.2 纳米晶双相复合稀土永磁材料 PAGEREF _Toc293080275 \h 1 HYPERLINK \l _Toc293080276 1.2.1 纳米晶双相复合稀土永磁材料的分类 PAGEREF _Toc293080276 \h 1 HYPERLINK \l _Toc293080277 1.2.2 纳米晶双相复合稀土永磁材料的特点 PAGEREF _Toc293080277 \h 1 HYPERLINK \l _Toc293080278 1.2.3 纳米晶双相复合稀土永磁材料的发展历程 PAGEREF _Toc293080278 \h 2 HYPERLINK \l _Toc293080279 1.2.4 提高纳米晶双相复合稀土永磁材料的磁性能 P