高择优取向的单一LPSO相镁合金的制备、微观组织调控及其内耗影响机制的研究

项目名称： 高择优取向的单一LPSO相镁合金的制备、微观组织调控及其内耗影响机制的研究

项目编号： No.51271206

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 一般工业技术

项目作者： 王敬丰

作者单位： 重庆大学

项目金额： 80万元

中文摘要： 本项目针对长期困扰镁合金的阻尼性能与强度难以兼得的科学难题，基于实验中发现长周期有序相（LPSO）能同时提高镁合金阻尼性能和强度的新现象，以Mg-Zn(Ni)-Y合金和纯Mg作为研究对象，通过定向凝固制备出高择优取向的单一LPSO相和HCP相，测量其不同方向的临界分切应力、剪切模量、强度等基本特性参数；然后采用形变和热处理协同耦合技术调控得到几种具有典型单一位错型组织、孪晶型组织和晶界型组织的样品，并对比分析位错、孪晶和晶界等对LPSO相和HCP相内耗的影响规律；最后综合其内耗的应变谱、频率谱、温度谱和LPSO相的基本特性参数及层错能的第一性原理计算，澄清镁合金LPSO相的内耗影响机制。本项目为新型高强高阻尼镁合金研发提供新的思路和理论指导，也为弄清LPSO相的强韧化机制提供借鉴。

中文关键词： 镁合金；长周期堆垛有序相；内耗机制；定向凝固；微观组织调控

英文摘要： This project takes aim at an academic problem that the contradictory between the damping and mechanical properties in magnesium alloy. And it is focusing on internal friction mechanism of long-period staking ordered (LPSO) phase in magnesium alloys, based the on the new phenomemon that LPSO phase can improve the strength and damping of magnesium alloy. The Mg-Zn (Ni)-Y alloys consisted of the highly preferred orientation single LPSO phase and close-packed hexagonal phase (HCP) phase of high purity magnesium will be as the research object. To beginning with, prepared the highly preferred orientation single LPSO phase and HCP phase according to directional solidification so as to measure the basic characteristic parameters of different direction ,such as critical resolved shear stress，shear modulus，strength and strain damping；then taking the special deformation and heat treatment to get some kinds of samples which come from typical dislocation type structure、twins type structure、grain boundary type structure and also contrastive analysis the influence discipline that the dislocation、twins、grain boundary to LPSO phase and HCP phase internal friction.At last ,considered all strain spectrum、frequecy spectrum、temperature spectrum of internal friction and the first principle calculation results of LPSO phase in order t

英文关键词： Magnesium alloys；Long-period staking ordered phases；Damping capacities；Directional solidification；Deformation microstructures