Y和Mn含量优化对MgZnYMn球形准晶形成的影响  

Effect of Yttrium and Manganese Content on Formation of MgZnYMn Spherical Quasi-Crystal

作　　者：张金山[1] 王晓明 杜二玲[1] 严杰[1] 许春香[1] 

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]南车集团戚墅堰机车车辆工艺研究所,江苏常州213011

出　　处：《铸造》2009年第1期24-27,共4页Foundry

基　　金：国家自然科学基金(50571073);山西省自然科学基金(20051052,2007011067);太原市大学生专项(07010713)

摘　　要：研究了Mn和Y含量对准晶尺寸、数量及圆整度的影响，结果表明，Y含量对准晶数量有主要影响，随Y含量增加，准晶数量大幅度增加；Mn在一定范围内促进准晶的生成，当Mn含量超过一定量时，又反过来抑制准晶形成。Mn、Y含量二者交互作用对准晶尺寸起很大决定性作用，当Y含量较高时，Mn含量如相对较低，那么Mn作为准晶生长核心的作用较突出，球化作用不足，得到准晶数量多，但圆整度差。当Mn元素相对含量较高时，造成界面不稳定，促使准晶向花瓣状生长，使尺寸变大。为获得圆整，数量多的准晶，最优异成分搭配（质量）为Y约4．0．％，Mn约3．9％-4．3％，若同时适当降低Mn和Y的含量也可获得圆整度较高球形准晶，但准晶数量减少。为此可根据需要，合理调整Mn和Y含量。从而获得不同形貌的准晶相。In this study, the influence of Mn and Y content on the number, grain size, roundness, and the amount of quasi-crystals is investigated. The results show that the Y content has a major impact on the quasi-crystals amount. With the increase of Y the number of quasi-crystals substantially-increases; in a certain range Mn accelerate the spherical quasi-crystals＇ formation, while when exceeds a certain amount, conversely it inhibits the formation of quasi-crystals. Mn, Y content and the interaction of the two play a great role on the size of quasi-crystal. When the Y is at a high level while Mn content is relatively low, Mn as the growth nucleus of the quasi-crystal is much more prominent than the role of spheroidization. Although the amount of quasi-crystals is increases the roundness becomes poor. When Mn content is at a relatively high level, it causes instability of the interface, and results in the growth of large petal-shaped quasi-crystals. To obtain a large number of round quasi-crystals, the optimal composition is Y 4.0%, Mn 3.9%-4.3%. An appropriate reduction of the content of both Mn and Y at the same time can also lead to spherical quasi-crystal, while the number of quasi-crystals decreases. Hence, the content of Mn and Y can be optimized according to the need to get quasi-crystal phase with different morphology.

关 键 词：Y和Mn 成分优化 球形准晶 镁合金 

分 类 号：TG113.12[金属学及工艺—物理冶金] TG146.22[金属学及工艺—金属学]