摘要
在氩气保护下用单辊熔体快淬法制备了不同Cu含量的Sm(Co0.74CuxFe0.1Zr0.04)8(x(Cu)=0,x(Cu)=0.1％,x(Cu)=0.12％,x(Cu)=0.16％)快淬带。将快淬带进行不同温度(400、500、600、700℃)回火处理。用振动样品磁强计、差热分析仪和X-射线衍射仪分别测定了样品的磁性、相变行为和相结构。研究表明,x(Cu)=0.12％的Sm(CoCuFeZr)8合金矫顽力最高,X-射线结构分析显示其对应的主要相为Cu7Tb型1:7相结构。x(Cu)=0.12％样品的快淬态与500℃回火态的衍射峰比较,其快淬态衍射峰稍有宽化,表明500℃回火后晶粒稍有长大。高温M-T磁性分析和差热分析DTA分析显不在380℃和801℃有磁相变,380℃有1:5相亚温分解,801℃是1:7相的居里点。分析表明500℃回火后矫顽力的提高是由于Cu向晶界的偏聚造成钉扎作用增强引起的。
The Sm(Co0.74CuxFe0.1Zr0.04)8(x=0,0.1, 0. 12,0. 16)ribbons with different Cu contents have been prepared by single roller melt spinning in Ar gas. The prepared ribbons are annealed at different temperature(400,500,600,700℃) for 30 min. Magnetic measurements show that the maximal coercivity can be obtained in the x = 0. 12 samples annealed at 500℃. X-ray diffraction analyses show that the as - quenched and annealed ribbons of x = 0. 12 are TbCu7 - type structure. But the diffraction peak of as quenched samples is slightly broad, which means that the grain size of samples has grown up after annealing. M-T magnetic and DTA analysis reveal that magnetic phase transformation may occur at 380℃ and 800℃. The transformation at 380℃ respon des to the spinodal decomposition and the 800 ℃ corresponds to the Curie point of phase 1: 7. The strong pinning of the walls of the network of grain boundaries in which the Cu is gathered results in the improvement of the coercivity of ribbons.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2005年第1期6-9,共4页
Ordnance Material Science and Engineering
基金
教育部科学技术重点项目资助课题
