Ti基非晶/纳米晶复合材料冷静液机械压制变形机理及光化学性能

项目名称： Ti基非晶/纳米晶复合材料冷静液机械压制变形机理及光化学性能

项目编号： No.51204062

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 冶金与矿业学科

项目作者： 王东君

作者单位： 哈尔滨工业大学

项目金额： 25万元

中文摘要： Ti基非晶合金因比强度高、耐腐蚀性能好等优势而备受关注，而玻璃形成能力有限及室温塑性较小制约了其进一步工程化应用。采用粉末固结方法制备Ti基大块非晶合金复合材料，可以达到增大尺寸并提高单一材料力学性能的目的。另外，探索Ti基大块非晶合金复合材料先进的光化学性能，可以拓宽其功能化应用范围。本项目拟深入研究气雾化内生Ti基非晶/纳米晶复合粉末在冷静液机械压制过程中的变形致密化机理，揭示内生纳米晶及非晶/纳米晶界面对复合粉末变形过程的影响规律，表征大块非晶/纳米晶复合材料的力学及光化学性能，从原子尺度上阐明大块复合材料的变形机理及退合金化机制，从而建立变形致密化－组织结构－力学行为及光化学性能之间的本构关系，为新型Ti基非晶合金复合材料的开发提供理论指导依据，并进一步推动其在高新技术产业中的应用。

中文关键词： 非晶合金；粉末冶金；致密化；变形行为；退合金化

英文摘要： Ti-based bulk metallic glasses (BMGs) are a class of advanced materials which have drawn extensive attention due to their high specific strength and superior corrosion resistance. However, the widespread engineering applications of Ti-based BMGs are severely hindered by the size limitation and lack of ductile deformation at room temperature. To overcome these restrictions, various powder-consolidation methods have been employed to obtain large-sized BMGs and their composites with enhanced mechanical properties. Moreover, the developing of advanced photochemical properties further contributes to offer opportunities for the functional applications of Ti-based BMG composites. In this project, large-sized Ti-based BMG composites will be fabricated using the cold hydro-mechanical pressing technique and the deforming densification mechanism of the gas atomized Ti-based metallic glassy/nanocrystalline composite powders will be comprehensively studied. We will systematically reveal the effect of the in-situ formed nanocrystals, as well as the interfaces between the glassy matrix and the nanocrystals, on the densification behavior of the composite powders during pressing. In addition, the mechanical and photochemical properties of the sintered bulk composites will be also investigated, leading to intrinsic understanding

英文关键词： Amorphous alloy；Powder metallurgy；Densification；Deforming behavior；Dealloying