TiAl基金属间化合物合金电致塑性轧制变形行为与软化机制研究

TiAl alloy sheet has promising prospect in aviation and aerospace fields, but the application of TiAl alloy sheet is limitied by its poor plasticity and hard rolling performance. In order to improve the plasticity and decrease deformation resistance, electropulsing is intend to using in the progress of TiAl alloy sheet rolling. According to the special bonding and crystal structure, different microstrucutre component, and by comparing with the plane strain compression experiment, the dislocation movement and the plastic deformation behavior of γ phase are researched systematically. Based on the influence of electropulsing, the behaviour of DRX and DRV are analyzed, and the deformation mechanism of electroplastic rolling is illustrated. The MDRX, SRX and the evolution of microstructure and mechanical properties of electroplastic rolling TiAl sheet are illustrated, and the dynamic and static recrystallization mechanism of TiAl alloy electroplastic rolling is revealed in the end. The research of this project will not only promote the rolling of TiAl alloy, but also improve the electroplastic manufacture theoretical system.

轻质、耐热TiAl合金板材在航空航天领域具有广泛的应用前景，但TiAl合金塑性差，板材轧制困难，制约了TiAl合金板材的应用。本项目将高能脉冲电流应用于TiAl合金板材轧制过程中，提高其塑性、减小变形抗力。针对TiAl合金特殊键合方式、晶体结构以及组织结构的特点，对比平面应变压缩模拟实验，系统研究脉冲电流对γ相位错运动及γ相塑性变形行为的影响规律。基于脉冲电流的影响，分析DRX、DRV等动态软化行为，阐明脉冲电流作用下轧制变形行为。阐明TiAl合金电致塑性轧制板材MDRX和SRX行为及组织性能演变规律，并最终揭示电致塑性轧制TiAl合金动静态再结晶机制。通过本项目的研究，将促进TiAl合金板材轧制，并完善电致塑性加工理论。

轻质、耐热TiAl合金板材在航空航天领域具有广泛的应用前景，但TiAl合金塑性差，板材轧制困难，制约了TiAl合金板材的应用。高能脉冲电流在钛合金和镁合金板材制备上表现出良好的辅助性能。因此开展电致塑性轧制和高温包套轧制，制备TiAl合金板材，分析高温变形行为和力学性能。研究结果表明，由于较小的变形窗口，无包套电致塑性轧制不能有效改善TiAl合金轧制性能，而高温包套轧制成功制备出性能优异的TiAl合金板材。