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。
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.
出处
《铸造》
EI
CAS
CSCD
北大核心
2007年第1期14-17,共4页
Foundry
关键词
Sn冷铜型
晶粒尺寸
冷却速度
显微硬度
抗拉强度
Sn-cooling copper mold
grain size
cooling rate
micro-hardness
tensile strength