基本信息
项目批准号：51401125
申请代码：E0101
项目名称：镁合金中LPSO结构在搅拌摩擦加工过程的演变机制
项目负责人：郑飞燕
依托单位：上海交通大学
研究期限：2015-01-01 至 2017-12-31
资助经费：25.0（万元）

项目摘要
中文摘要：
长周期有序结构（LPSO）强化的镁合金已显示了优异的力学性能和显著的应用前景。但是，该类合金中存在的粗大且不均匀的晶界X相(LPSO结构)及晶内LPSO，严重限制了合金强度和韧性的进一步提高，而且这种分布形态难以采用常规的成分设计、制备或加工方法来进行有效调控。本项目选择含LPSO 结构的Mg-Gd-Zn 合金为研究对象，利用具有大塑性变形特征的搅拌摩擦加工（FSP）方法实现对合金中第二相的显著细化与均匀化，通过对FSP 合金微观结构的研究，揭示LPSO结构在FSP 过程的演变规律与机制，阐明LPSO 结构演化对合金的动态再结晶以及织构特征的影响，为高性能镁合金材料的开发与应用提供理论指导。
英文摘要：
As one of the strengthening factor in Mg alloys, LPSO(Long Period Stacking Order) structure has great potential for improving the strength and ductility of magnesium alloys，leading to excellent mechanical properties of LPSO-containing Mg-RE-Zn alloys, with great potential applications. However, in all these LPSO-containing Mg-RE alloys, the distribution of LPSO in the grains is non-uniform, and the X phase(LPSO structure) at grain boundaries are very coarse, which obviously restricts the further improvement of strength and ductility of these alloys. Meanwhile, it is much hard to modify the morphology of these phases by conventional composition adjustment, solidification and forming techniques. In this project, Mg-Gd-Zn alloy will be selected as representative research material and processed by friction stir processing (FSP). The aims of this project is to reveal the evolution rule and mechanism of LPSO structure and its effects on dynamic recrystallization behavior and texture characteristics of Mg-Gd-Zn alloy during FSP. At last, some theoretical guidelines for the design and development of high-performance Mg-RE alloys containing LPSO structure will be provided in this project by research reports.
 
 
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