往复墩-挤Al2O3/2024铝基复合材料的变形机制、组织结构演变规律及强韧化机理研究

项目名称： 往复墩-挤Al2O3/2024铝基复合材料的变形机制、组织结构演变规律及强韧化机理研究

项目编号： No.51271076

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： 高文理

作者单位： 湖南大学

项目金额： 80万元

中文摘要： 非连续增强铝基复合材料作为轻量化结构材料广泛应用于航空航天、交通运输等工业领域。塑性变形是非连续增强铝基复合材料的重要成形技术，但在常规的塑性变形过程中，铝基复合材料中的颗粒增强相往往呈条带状分布，致使材料力学性能降低。金属材料大塑性变形技术具有强烈的组织细化能力，可以有效地细化晶粒和第二相，使它们在基体中均匀分布，显著提高材料强度和塑性。本项目拟采用往复镦-挤技术对Al2O3/2024铝基复合材料进行大塑性变形，研究该材料往复镦-挤的变形机制、多道次往复墩-挤复合材料组织结构演变规律及其对力学性能的影响，揭示Al2O3/2024铝基复合材料往复镦-挤变形的强化韧化机理，为利用往复镦-挤变形技术改善颗粒强相分布的均匀性，消除颗粒增强相的条带状分布，获得均匀的细晶组织，制备先进高性能Al2O3/2024铝基复合材料提供理论基础。

中文关键词： 往复镦-挤；塑性变形；铝基复合材料；强韧化机制；

英文摘要： Plastic deformation is the requisite forming technology for the practical application of non-continuous reinforced aluminium matrix composites. But during the normal deformation, The reinforced particles were distributed along the direction of the metal plastic flowing, resulting in the poor property. Severe plastic deformation technique has the ability to produce exceptional structure refinement. The grains and the second phase during SPD are effectively refined, and the refined second phases are uniformly distributed in the matrix, improving the strength and the ductility. In the present project, Al2O3/2024 aluminium matrix composites were deformed by a modified repeated upsetting and extrusion (RUE) process. The deformation mechanisms, the evolution law of the microstructure and tensile properties during multi-pass RUE process was studied, the strengthening mechanism of RUE processed composite was indicated. The purpose of this investigation lies in providing a theoretical guidance for the industrial preparation of high-performance Al2O3/2024 aluminum matrix composite with uniform particle reinforcement distribution and fined-grain microstructure.

英文关键词： Repeated upsetting and extrusion；Deformation；Aluminum matrix composite；Strengthening and toughening mechanism；