熔融6061/4043铝合金在TC4钛合金表面的反应润湿

doi:10.11900/0412.1961.2016.00289

金属学报

2017, Vol. 53

Issue (4): 479-486 DOI: 10.11900/0412.1961.2016.00289

本期目录 | 过刊浏览

熔融6061/4043铝合金在TC4钛合金表面的反应润湿

靳鹏¹,隋然²,李富祥¹,俞伟元¹,林巧力¹(

)

1 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
2 兰州工业学院材料工程学院兰州 730050

Reactive Wetting of TC4 Titanium Alloy by Molten 6061 Al and 4043 Al Alloys

Peng JIN¹,Ran SUI²,Fuxiang LI¹,Weiyuan YU¹,Qiaoli LIN¹(

)

1 State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metal, Lanzhou University of Technology, Lanzhou 730050, China
2 School of Materials Engineering, Lanzhou Institute of Technology, Lanzhou 730050, China

引用本文:

靳鹏,隋然,李富祥,俞伟元,林巧力. 熔融6061/4043铝合金在TC4钛合金表面的反应润湿[J]. 金属学报, 2017, 53(4): 479-486.
Peng JIN, Ran SUI, Fuxiang LI, Weiyuan YU, Qiaoli LIN. Reactive Wetting of TC4 Titanium Alloy by Molten 6061 Al and 4043 Al Alloys[J]. Acta Metall Sin, 2017, 53(4): 479-486.

全文: PDF(5282 KB) HTML

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600~700 ℃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。

关键词 ：前驱膜, Ti-6Al-4V, 界面反应

Abstract：

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.

Key words： precursor film Ti-6Al-4V interfacial reaction

收稿日期: 2016-07-07

基金资助:国家自然科学基金项目Nos.51665031和51465032

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https://www.ams.org.cn/CN/10.11900/0412.1961.2016.00289 或 https://www.ams.org.cn/CN/Y2017/V53/I4/479

图1 润湿实验装置示意图

表1 实验材料的名义化学成分

图2 熔融6061、4043铝合金分别在TC4钛合金基板上接触角和归一化接触半径随时间的变化

图3 6061铝合金与TC4钛合金在600 ℃润湿后的SEM像

图4 4043铝合金与TC4钛合金在600 ℃润湿后的SEM像

图5 4043铝合金与TC4钛合金在650 ℃润湿后的SEM像

图6 铝合金与TC4钛合金润湿后样品由NaOH溶液去除凝固的Al后的宏观形貌及SEM像

图7 6061和4043铝合金与TC4钛合金润湿后前驱膜的XRD谱、界面XRD谱及原始TC4钛合金XRD谱

图8 动力学常数k1、k2的Arrhenius曲线

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