铸态金铂合金的成分偏析调控研究

金铂合金以高密度、高硬度、良好的导电导热性能及超低剩磁矩和磁化率在航空领域中作为验证质量得到了广泛应用，但金铂合金制备过程中存在着极为严重的成分偏析现象。本文主要针对此问题开展研究工作，采用高频感应炉和喷铸两种工艺制备金铂合金样品，通过多道次轧制并结合固溶工艺研究金铂合金的成分偏析的分布状态，结果表明，高频感应炉制备的金铂合金成分偏析较为严重，喷铸工艺成功实现对金铂合金成分偏析的调控，通过EDS能谱分析发现喷铸工艺较感应熔炼工艺可将成分偏差由20%控制为1%。随后利用Anasys fluent计算模拟得到金铂合金两种不同制备工艺下凝固过程中的温度场、流场及溶质场分布。

Study on the regulation of cast segregation of Au-Pt alloy

Au-Pt alloy has been widely used in the aviation field as verification quality with high density, high hardness, good electrical and thermal conductivity, ultra-low residual magnetic moment and magnetic susceptibility. But there is a very serious component segregation phenomenon in the preparation process of Au-Pt alloy. This paper is mainly based on this research, high frequency induction furnace and spray casting two processes are used to prepare Au-Pt alloy samples, then the distribution state of component segregation of Au-Pt alloy is studied by multi-pass rolling combined with solution process, the results show that the high frequency induction furnace prepared Au-Pt alloy composition segregation is more serious and the spraying process successfully realizes the regulation of Au-Pt alloy component segregation. Through EDS energy spectrum analysis, it is found that the composition deviation of the spraying process can be controlled from 20% to 1% compared with the induction melting process. Subsequently, the Anasys fluent calculation simulation is used to obtain the temperature, flow and solute field distribution during the solidification process under two different preparation processes of Au-Pt alloy.