多场耦合作用下制备高性能粉末冶金TiAl合金板材的基础研究

项目名称： 多场耦合作用下制备高性能粉末冶金TiAl合金板材的基础研究

项目编号： No.U1435203

项目类型： 联合基金项目

立项/批准年度： 2015

项目学科： 矿业工程

项目作者： 张国庆

作者单位： 中国航发北京航空材料研究院

项目金额： 140万元

中文摘要： TiAl合金是一种新型的轻质高温结构材料，在航空航天和汽车发动机等领域有广阔的应用前景，粉末冶金方法可以消除铸造缺陷，有望实现TiAl合金尤其是TiAl合金板材的工程化应用。本项目拟开展研究冷坩埚电磁场、温度场和流场多个物理场的耦合作用下TiAl合金液的导流与雾化行为，建立粉末冶金TiAl合金致密化过程中微缺陷形成和控制的基础理论，明确在温度场、应力场、速度场等多场耦合作用下板材轧制变形机理，突破TiAl合金纯洁熔炼、液态金属导流、雾化喷嘴结构设计、气雾化粉末氧含量和粒度控制以及高致密度大尺寸粉末冶金坯体制备和无缺陷板材轧制成形等技术关键，获得高纯低氧球形气雾化粉末和高性能粉末冶金板材的制备与加工技术基础，解决高性能大尺寸粉末冶金构件制备难题，满足以满足我国高超音速飞行器的研发用材的需求。

中文关键词： TiAl合金；粉末冶金；板材；多场耦合

英文摘要： TiAl alloy represents a new class of light-weight structural materials for high temperature, the powder metallurgy route offers an attractive alternative to the ingot rout for the preparation of TiAl alloy especially of TiAl sheet. In this project, aim at the foundation science problems about the fabrication of high performance of TiAl sheet by gas atomized prealloy powders, the delivery and atomization mechanism of TiAl alloy melt on the condition of cold crucible with electric, magnetic, temperature and flow multi- coupled fields was investigated, and the multi-phase fluid simulation was analyzed to evaluate the breakup mechanism during atomizing process. Gas atomization of prealloyed powder followedby hot isostatic pressing (HIP) to full density is viable approach for the production of forging and rolling performs, the forming and controlling mechanics of defects during the densification process for PM TiAl alloy was also studied. Through computer simulation combined with physical simulation of temperature, stress and velocity multi- coupled fields, the rolling deformation mechanism of TiAl alloy was analyzed. The subject is to break through the super refining, melt delivery, atomization nozzle design, oxygen controlling and high density hiped billets and high performance in large scale hot working technology, to supply the.foundation of development of TiAl alloy powder processing and meet the requirements of light structural materials for high-temperature applications in aerospace and other areas

英文关键词： TiAl alloy;powder metallurgy;sheet;；Multi-fields coupling