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采用多层喷射共沉积技术制备了S iCp/7090A l复合材料锭坯,对其进行了热挤压变形,研究了固溶处理对复合材料显微组织及力学性能的影响。结果表明,挤压态S iCp/7090A l复合材料的基体合金中存在大量短棒状的MgZn2相及圆形的CuA12相颗粒,晶粒内部的MgZn2粒子长约200 nm,直径约60 nm;晶粒内的CuA l2相为直径40~420 nm的球形粒子,主要分布在晶界或近晶界区域。确定了最佳固溶温度为475℃,固溶时间为1 h。经过固溶处理后,析出相颗粒MgZn2及CuA l2粒子溶入到基体,复合材料棒材的力学性能为:σb=610 MPa,δ=2.0%。
S iCp / 7090A 1 composite ingot was prepared by multi-layer spray co-deposition technique and hot extrusion deformation was carried out. The effect of solution treatment on the microstructure and mechanical properties of the composite was studied. The results show that there are a large number of short rod-like MgZn2 phase and round CuA12 phase particles in the matrix alloy of S iCp / 7090A l in the as-extruded state. The grain size of MgZn2 particles is about 200 nm and the diameter is about 60 nm. The CuAl2 phase is a spherical particle with a diameter of 40-420 nm, which is mainly distributed in the grain boundary or the grain boundary region. The optimum solution temperature was 475 ℃ and the solution time was 1 h. After solution treatment, the precipitated phase particles MgZn2 and CuAl2 particles are dissolved into the matrix. The mechanical properties of the composite rods are: σb = 610 MPa, δ = 2.0%.