热等静压烧结制备Ti/Al3Ti金属间化合物层状复合材料的微观结构和性能

Microstructure and Properties of Ti/Al3Ti Intermetallic Layered Composites Prepared by Hot Isostatic Pressing Sintering

摘要:

Ti/Al3Ti金属间化合物层状复合材料因其本身具有高比弹性模量、低密度、高比强度、抗蠕变能力强、抗氧化能力强、耐高温等优异的性质，在航天精密零部件、装甲防弹、现代武器、汽车工业等领域广泛应用。利用热等静压烧结工艺制备了Ti/Al₃Ti金属间化合物层状复合材料，对复合材料的微观结构、显微硬度、压缩性能、拉伸性能进行了探究。结果表明：在保温700 ℃、压力为150 MPa条件下，烧结得到的复合材料无明显缺陷、界面结合良好；复合材料的硬度值呈周期性变化，Ti层在300 HV左右、Al₃Ti层在530—600 HV之间、中心线处在530—540 HV之间；Ti层的引入对复合材料整体韧性有所提升，在静态压缩测试中垂直于叠层方向的平均最大抗压强度为1 185.1 MPa、平行于叠层方向为894.6 MPa，在静态拉伸测试中最大抗拉强度为281.7 MPa。说明，采用热等静压烧结工艺制备的Ti/Al₃Ti金属间化合物层状复合材料具有优异的力学性能。

Abstract:

Ti/Al₃Ti intermetallic layered composites were prepared by hot isostatic pressing sintering. The microstructure， microhardness， compressive properties and tensile properties of composite materials were investigated. The result showed that the composite materials with no obvious defects and well-bonded interface could be obtained under the conditions that the insulation temperature kept at 700 ℃ and the pressure kept at 150 MPa. The hardness of the composite material varied at different layers. The hardness values of the Ti， Al₃Ti and centerline layers were around 300 HV， 530—600 HV， and 530—540 HV， respectively. The introduction of the Ti layer improved the overall toughness of the composite material. In the static compression test， the average maximum compressive strength perpendicular to the laminate direction was 1 185.1 MPa， and parallel to the laminate direction was 894.6 MPa. The maximum tensile strength in the static tensile test was 281.7 MPa.