氢化脱氢钕铁硼微观组织结构的变化  

Microstructure Evolution of Hydrided and Dehydrided Nd_(13)Fe_(81.5)B_(5.5)

作　　者：侯雪玲[1] 孔俊峰[1] 金红明[1] 李增峰[2] 庞薇[2] 石永金[2] 罗建军[2] 谈萍[2] 张晗亮[2] 

机构地区：[1]上海大学,上海200072 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2005年第7期1058-1060,共3页Rare Metal Materials and Engineering

摘　　要：采用SEM和XRD对Nd13Fe81.5B5.5合金氢化-歧化-脱氢过程中相结构和组织形貌的变化进行了观测分析,结果表明:非受热的Nd13Fe81.5B5.5合金的吸氢只能在富钕相的晶界上进行,吸氢的过程伴随着热量的释放.加热后的Nd13Fe81.5B5.5合金吸氢不仅沿着Nd13Fe81.5B5.5富钕相晶界进行,而且也能在其晶格内进行.合金吸氢后生成物主相为NdH2.9和α-Fe,还有微量的Fe2B和Fe2Nd,吸氢的过程伴随着大量热的释放,Nd13Fe81.5B5.5合金的吸氢温度为700℃,在730℃～800℃的范围内脱氢,在此工艺条件下,能获得高质量的氢化物.The alloy with chemical compositions of Nd13Fe81.5B5.5 has the function of hydrogen absorption in room temperature. When heated, its function of hydrogen absorbing is better. The results show that absorbing hydrogen for the nonheated Nd13Fe81.5B5.5 alloy occurs only in the crystal boundary of the rich Nd-phase accompanying the release of heat in process of absorbing hydrogen. When heated up, absorbing hydrogen for the alloy occurs not only in crystal boundary of rich Nd-phase but also in the crystal inner. After absorbing hydrogen, the main phases of the alloy are NdH2.9 and alpha-Fe with minor phases Fe2B and Fe2Nd accompanying the release of the mass heat. The hydrogen absorbing temperature for the alloy is 700 degrees C. Dehydriding occurs in the range of 730 degrees C similar to 800 degrees C. High quality of the hydride can be produced under the above-mentioned condition.

关 键 词：氢化-脱氢 钕铁硼 组织结构 

分 类 号：TF125.8[冶金工程—粉末冶金]