喷射成形2124铝合金的热轧致密化与力学性能

摘要

2124 aluminum alloy was prepared by spray forming technology. Its densification mechanism during hot rolling was investigated. The effects of deformation rates and deforming temperature on microstructures and mechanical properties were also studied. The results show that the optimum deforming temperature is 450 ℃, and at this temperature the deposit maintains a fine grain microstructure and a relatively high strength after hot rolling. The densification rate is high when the total deformation extent is less than 30%, however, when the total deformation extent is up to 40% the fully dense alloy can be fabricated. At the temperature of 450℃ and deformation extent of 80%, the tensile strength of the spray formed and rolled alloy is superior to those of as-cast and rolled ones. After T6 heat treatment, the tensile strength of spray formed and rolled strip is enhanced. Its tensile strength is 502.2 MPa and elongation is 12.23%.%　　采用喷射成形方法制备2124铝合金坯，探索其热轧致密化工艺，并研究热轧变形量和变形温度对材料显微组织和力学性能的影响。结果表明，材料最佳的热轧温度为450℃，在该温度下热轧可以保持喷射成形工艺制备的2124铝合金获得细小晶粒组织的优势，且轧件可以获得较佳的力学性能。热轧过程中，当总变形量小于30%时，材料的致密化速度较快；当总变形量达到40%时，材料基本完成致密化。当热轧温度为450℃，变形量为80%时，喷射成形+轧制后材料的拉伸性能高于铸造+轧制的材料。对喷射成形+热轧材料进行 T6处理，材料强度可较大提高，抗拉强度达到502.2MPa，伸长率为12.23%。