熔融6061和4043铝合金在纯钛表面的反应润湿 |
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引用本文: | 钟伟强,靳鹏,李富祥,林巧力,陈剑虹. 熔融6061和4043铝合金在纯钛表面的反应润湿[J]. 材料工程, 2017, 0(12): 17-24. DOI: 10.11868/j.issn.1001-4381.2017.000684 |
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作者姓名: | 钟伟强 靳鹏 李富祥 林巧力 陈剑虹 |
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作者单位: | 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室 ,兰州,730050 |
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摘 要: | 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600,650,700℃分别与纯钛(TA2)的反应润湿行为。结果表明:Al/Ti体系属于典型的反应润湿,铝合金中微量的Si元素在界面上产生了明显富集且满足热力学条件;界面上形成了富Si的致密的层片状Ti_7Al_5Si_(12)相,致密层产生后阻碍熔体润湿母材;Ti_7Al_5Si_(12)相的分解及三相线附近疏松的粒状Al_3Ti相产生后能够破除钛表面的氧化膜,进而促进润湿;6061/TA2和4043/TA2两润湿体系铺展动力学均可由反应产物控制(Reaction Product Model)模型描述,整个润湿铺展过程分为两个阶段,即先呈指数铺展、后呈线性铺展;6061铝合金对应两个阶段的铺展活化能分别为56kJ/mol和112kJ/mol,4043铝合金以指数铺展为主,铺展活化能为47kJ/mol,Ti_7Al_5Si_(12)相的分解对应于指数铺展阶段。
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关 键 词: | 反应润湿 热浸镀 前驱膜 TA2 |
Reactive Wetting of Pure Titanium by Molten 6061 and 4043 Aluminum Alloys |
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Abstract: | The wetting of TA2 pure Ti by two industrial grade Al alloys (i .e .,6061 Al and 4043 Al al-loys) was studied by using the modified sessile drop method at 600 ,650 ,700℃ under high vacuum . The results show Al/Ti system is a typical reactive wetting ,the small amount of alloying element Si in the Al alloys can cause significant enrichment at liquid/solid interface and satisfy thermodynamic condition;the formation of the Si-rich phase (Ti7 Al5 Si12 ) strangling material exchange at triple line zone;Ti7 Al5 Si12 decomposition and Al3 Ti formation can remove the oxide film and promote wetting ;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 forthe linear spreading ;the activation energies w hich are 56kJ/mol ,47kJ/mol for nonlinear stages of 6061 Al and 4043 Al alloys ,and 112kJ/mol for linear stage of 6061 Al alloys ,respectively ,Ti7 Al5 Si12 decomposition is corresponding to the nonlinear spreading . |
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Keywords: | reactive wetting hot dip precursor film TA2 |
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