制备工艺对铝基复合材料活塞性能的影响

Effects of Preparation Process on the Properties of Aluminum Matrix Composite Piston

采用复合热处理工艺,结合水冷模具和合金超声技术,研究了复合热处理工艺与特种铸造技术对TiB颗粒增强铝基复合材料活塞力学性能的影响。结果表明,复合热处理技术可以明显改善复合材料的力学性能,并获得了较优热处理工艺;水冷模具可以提高材料的凝固速率,细化晶粒,有效提高活塞试样的力学性能,制备的活塞试样具有较好的室温和350℃高温力学性能;超声处理可以改善TiB颗粒的分布和晶相组织,与未施加超声相比,活塞的高温抗拉强度提升了16.3%。

The influence of compound heat treatment and special casting on the mechanical properties of TiBparticle reinforced aluminum-based composite was investigated by compound heat treatment process,combined with the water-cooled die and ultrasonic treatment technology.The results indicate that compound heat treatment technology can significantly improve the mechanical properties of composites,and optimal heat treatment process is presented.Water-cooled molds can raise the solidification speed of materials and refine grain,effectively improving the mechanical properties of the piston specimens,which exhibits desirable room temperature and mechanical properties at 350 ℃.Ultrasound treatment can improve the distribution of TiBparticles and crystalline phase,increasing the high-temperature tensile strength by 16.3% compared with the one without ultrasound treatment.