Sm_2Fe_(17)合金的氢化-歧化过程演化  

Evolution of Sm_2Fe_(17) Alloys during Hydrogenation-Disproportion Process

作　　者：叶金文[1] 刘颖[1] 李梦[1] 高升吉[1] 涂铭旌[1] 

机构地区：[1]四川大学金属材料系,四川成都610065

出　　处：《中国稀土学报》2005年第3期303-306,共4页Journal of the Chinese Society of Rare Earths

摘　　要：通过X射线衍射(XRD)、扫描电镜(SEM)和能谱分析(EDX)等手段重点研究了Sm2Fe17合金在氢化-歧化过程中的相组成、相的变化以及微观结构的演化规律. 研究表明: 在0.1 MPa的H2气氛下, Sm2Fe17合金首先吸氢; 400 ℃时合金出现部分脱氢现象; 在T≥500 ℃逐渐开始歧化为SmHx和α-Fe, 同时生成了大量的微晶或非晶组织; 随着温度的升高, 合金中的微晶非晶逐渐晶化, 750 ℃时晶化完全, 晶粒长大至20～100 nm. 通过对Sm2Fe17合金的氢化-歧化过程研究, 建立了该过程的微观结构变化规律的物理模型.The evolution of the phase compositions, change of phase and microstructure in Sm2Fe 17 alloys during the hydrogenation-disproportion process, was systematically studied with XRD, SEM, EDX methods. Research indicates that the HD process of the Sm2Fe 17 alloys is as follows: the Sm2Fe 17 alloy absorbs hydrogen first at the atmosphere of hydrogenation at a pressure of 0.1 MPa, the disproportionation begins at a temperature of T≥500 ℃, the alloy turns into SmHx and α-Fe together with a large amount of microcrystals or amorphous structures. Along with the increase of temperature, the microcrystals or amorphous structures transform into crystal and the transformation is thoroughly completed at 750 ℃, and the grain size of crystals is about 20～100 nm. A model of the microstructure change of Sm2Fe 17 alloys in hydrogenation-disproportion process is proposed.

关 键 词：金属材料 SMFEN HDDR法 氢化 稀土 

分 类 号：TM273[一般工业技术—材料科学与工程]