TiB2含量对原位自生TiB2/2219铝基复合材料组织与性能的影响

利用混合盐高温反应法制备了原位自生TiB2/2219铝基复合材料铸锭. 通过光学显微镜、扫描电镜、X射线等显微组织表征方法以及弹性模量、室温拉伸和室温摆锤冲击实验等测试手段，研究了TiB2含量对原位自生TiB2/2219铝基复合材料组织和性能的影响. 研究表明，当TiB2质量分数由0提高到5%时，TiB2颗粒尺寸和TiB2/2219铝基复合材料铸锭的平均晶粒尺寸逐渐减小，固溶时效态的TiB2/2219铝基复合材料板材的弹性模量和强度显著上升，但延伸率和冲击韧性下降. 当质量分数为5%时，TiB2/2219铝基复合材料板材的弹性模量、抗拉强度、屈服强度和延伸率分别达到88.7 GPa、（474.2±2） MPa、（400.6±1） MPa和（4.7±0.1）%.

Effect of TiB2 Content on Microstructure and Properties of In-situ TiB2/2219 Aluminum Matrix Composites

The in-situ TiB2/2219 aluminum matrix composite ingots were prepared by using the high-temperature-mixed molten salt method. The effect of TiB2 content on microstructure and properties of in-situ TiB2/2219 aluminum matrix composites is investigated by optical microscopy, scanning electron microscopy, X-Ray diffraction, combined with elastic modulus, room temperature tensile and Charpy impact test methods. The results showed that the TiB2 mass fraction increased from 0 to 5%, and the TiB2 particle size and the average grain size of TiB2/2219 aluminum composite ingots decreased. The elastic modulus, tensile strength, and yield strength of TiB2/2219 aluminum matrix composite increased significantly as TiB2 content increased, but the ductility and impact toughness decreased. The elastic modulus, tensile strength, yield strength, and ductility of 5% TiB2/2219 aluminum matrix composites plate were 88.7 GPa, (474.2±2) MPa, (400.6±1) MPa and (4.7±0.1) %, respectively.