利用改良座滴法研究了高真空条件下熔融6061和4043铝合金在600~700 ℃分别与TC4钛合金的润湿行为。研究表明,Al/Ti体系属于典型的反应润湿,且铺展动力学可由反应产物控制模型描述,整个润湿过程分为先非线性铺展和后线性铺展2个阶段,即：铝合金中微量的Si元素在界面上产生了明显的富集并在界面上形成了富Si的Ti7Al5Si12;铺展过程中Ti7Al5Si12的分解对应于非线性铺展阶段,Ti7Al5Si12分解的同时伴随Al3Ti形成,对应于线性铺展阶段;润湿过程中出现了明显的前驱膜并伴随着较好的最终润湿性。
In order to improve the inoxidizability of TC4 alloy at high temperatures, hot dip aluminizing process is an efficient and economical way for industrial application. In this process, the wetting of TC4 alloy by molten Al alloy is the main factor which determined the coating quality. In this work, wetting of TC4 alloys by two industrial grade Al alloys (i.e., 6061 Al and 4043 Al alloys) were studied by using the modified sessile drop method at 600~700 ℃ under high vacuum. The results show that Al/Ti system is a typical reactive wetting, and the spreading dynamics can be described by reaction product control model, further the whole wetting behavior can be divided into two stages: the first stage for the nonlinear spreading and the second stage for the linear spreading. The small amount of alloying element Si in the Al alloys can cause significantly segregation at liquid/solid interface and formation of the Si-rich phase (Ti7Al5Si12). Ti7Al5Si12 decomposition is responsible for the nonlinear spreading, and Ti7Al5Si12 decomposition and Al3Ti formation are together responsible for the linear spreading. The formation of precursor film accompanies with the good final wettability.
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