【摘要】 选用金属Sn为冷却介质,将Al-Si-Mg铝合金熔体浇注到预制的模型中,制备Ф10mm的棒状试样,并且对合金的组织和力学性能进行了研究。结果表明,应用Sn冷铜型方法,可以将试样的晶粒尺寸细化到5μm,与相同条件下水冷铜型得到的试样(8μm)相比,晶粒尺寸细化了37.5%;铸态组织的显微硬度提高了33.3%(Sn冷铜型:80HV0.05;水冷铜型:60HV0.05),试样的抗拉强度提高了22.9%(Sn冷铜型:220MPa;水冷铜型:179MPa)。Sn冷铜型方法可以明显细化合金组织,提高合金的力学性能,有很好的应用前景。更多还原

【Abstract】 The melt of casting Al-Si-Mg aluminum alloys was cast into the mold cooled by Sn,then bar shape samples with a diameter of 10 mm were prepared.Microstructure and mechanical properties of the alloy were studied.The results shows that,compared with water cooling copper mold,microstructure with grain size of 5 μm in diameter could be obtained by Sn-cooling copper mold technique,which was refined 37.5% than that made by water-cooling copper mold(8 μm);micro-hardness(HV) was improved 33.3%(Sn-cooling copper mold: 80 HV0.05;water-cooling copper mould: 60 HV0.05) and ultimate tensile strength(UTS) was improved 22.9%(Sn-cooling copper mold: 220 MPa;water-cooling copper mould: 179 MPa).Therefore,Sn-cooling copper mold technique could obviously refine microstructure,improve mechanical properties and have a potential prospect in practical applications.更多还原