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本研究用三点弯曲实验测定了铝含量为43at·％～56at·％的Ti-Al二元合金的力学性能;利用光学显微镜、X射线衍射仪和透射电子显微镜研究了不同成分合金的微观组织和变形亚结构。实验结果表明:根据不同成分合金的微观组织可将其分成三类,即:γ-TiAl单相组织(52at·％～56at·％Al);双态组织(46at·％～50at·％Al)和全片层结构晶粒组织(43at·％～46at·％Al),其中以具有细晶双态组织的合金具有较好的塑性变形能力。本文从微观组织结构和变形位错组态的变化,探讨了合金成分对TiAl基有序合金塑性变形的影响机制。
In this study, the mechanical properties of Ti-Al binary alloys with aluminum content from 43 at% to 56 at% were measured by three-point bending test. The microstructures of Ti-Al binary alloys with different compositions were investigated by optical microscope, X-ray diffraction and transmission electron microscopy And deformed sub-structure. The experimental results show that the microstructures of alloys with different composition can be divided into three groups, namely γ-TiAl single phase microstructure (52at ·% ~ 56at ·% Al), binary microstructure (46at ·% -50at ·% Al) And the whole structure of the grain structure (43at ·% ~ 46at ·% Al), which has a fine crystalline binary alloys with good plastic deformation capacity. In this paper, the influence of alloy composition on the plastic deformation of TiAl-based ordered alloys was discussed from the microstructure and the dislocation dislocation configuration.