Ti/Ti-Al大尺寸微叠层材料的制备与性能研究

采用大功率电子束物理气相沉积(EB-PVD)技术制备了层厚比为1:1的Ti/Ti-Al微叠层复合材料薄板,用XRD和SEM对材料的微观结构进行了表征,对其室温及高温拉伸性能进行了测试.结果表明:材料由Ti,α2-Ti3Al和γ-TiAl相组成,层状结构对提高材料的室温塑性有利;尽管未经致密化处理的材料存在着较多微孔,但在金属间化合物层的反常强化及层间界面对裂纹的钝化作用下,材料仍具有较高的抗高温拉伸强度和良好的高温延迟断裂特性.

Preparation and Performance of Large-Sized Ti/Ti-Al Microlaminated Composite

Ti/Ti-Al microlaminated composite thin sheet with layered thickness ratio of 1:1 was prepared by high-powerful EB-PVD technology. The microstructure was characterized by XRD and SEM, and the tensile behavior of samples at room temperature and high temperature was tested. The experiment results show that the material is composed of Ti and a2-Ti3Al and γ-TiAl phases, the lamellar structure can increase the room temperature plasticity of the composite. Although there are more micro pores in undensified microlaminate composite, it still has a higher tensile strength and a good characteristic of delayed fracture at high temperature due to the anomalous strengthening behavior of intermetallic layers and the crack bluting induced by micro-layer interfaces.