cu se bi相互扩散行为及相变规律的分析word格式论文.docxVIP

phase and formed CuSe2 phase in the case of Selenium enough.For Se-Bi binary system,the powder Selenium have been alloyed completely in the process of ball milling and formed Bi2Se3 phase and BiSe phase. When the ball mill speed was 350 r/min, the grain refinement and lattice distortion was more serious.In Cu-Se-Bi ternary system of ball milling, the ball mill speed was 250 r/min and the ball milling time was 30 h, the Cu-Se-Bi ternary system alloyed completely, it generated the new phase which were Cu3Se2 phase, Bi2Se3 phase, and BiSe phase.Under the ball milling speed was 350 r/min, when the ball milling time was 40 h, the metal compounds occured amorphous transition; For Cu-Se-Bi ternary system of ball milling, the diffraction peaks of Copper and Selenium powder disappeared with the ball milling time,but the diffraction peak of Bismuth powder was always exist, and Cooper and Selemium alloyed priorly in ball milling process.Keywords: diffusion couples; the thermodynamic calculation;mechanical alloying; phase transition目录第一章 绪论 ....................................................................................................................................11.1 课题来源及意义 ................................................................................................................11.2 无铅易切削黄铜的发展与现状 .........................................................................................11.2.1 铅黄铜的易切削机理..............................................................................................11.2.2 合金元素对黄铜性能的影响 ..................................................................................21.2.3 无铅黄铜研究现状..................................................................................................21.3 扩散基本理论 ....................................................................................................................41.3.1 扩散的机制 .............................................................................................................41.3.2 扩