郭俊波,钟宏,刘振鹏,杨鲁岩,李双明.纤维尺寸和界面形态对定向凝固NiAl-Mo共晶合金电化学腐蚀性能的影响[J].稀有金属材料与工程,2019,48(4):1116~1123.[Guo Junbo,Zhong Hong,Liu Zhenpeng,Yang Luyan,Li Shuangming.Influence of fiber size and interface morphology on the electrochemical corrosion resistance of directionally solidified NiAl-9Mo eutectic alloy[J].Rare Metal Materials and Engineering,2019,48(4):1116~1123.]
纤维尺寸和界面形态对定向凝固NiAl-Mo共晶合金电化学腐蚀性能的影响
投稿时间:2017-11-06  修订日期:2018-02-26
中文关键词:  定向凝固  NiAl-Mo共晶  界面形态  电化学腐蚀
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:
      由于凝固组织对腐蚀有着重要的影响,本文主要目地获取最优组织形态和电化学参数生产钼纳米丝。研究表明NiAl-Mo共晶合金定向凝固下,组织由基体NiAl相和纤维Mo相共生耦合生长。随着抽拉速率从10 μm/s增大到40 μm/s时,纤维尺寸从800 nm减小到300 nm,界面形态也从平界面变化成胞界面。同时在0.1 M HCl电解液下测量其极化曲线,发现凝固速率为20 μm/s时耐腐蚀性能最好。对于NiAl-Mo共晶合金,影响电化学腐蚀性能不仅仅是纤维尺寸,而且还取决于界面形貌。为了更进一步研究界面形态对腐蚀的影响,本文设计了跃迁变速实验,实验表明定向凝固组织形貌会随着变速比的增大从平界面变成胞界面最后变成枝界面,然而最后的纤维尺寸和变速比无关,和恒速抽拉相同。极化曲线表明平界面有着最好的耐腐蚀性能。
Influence of fiber size and interface morphology on the electrochemical corrosion resistance of directionally solidified NiAl-9Mo eutectic alloy
英文关键词:directional solidification  NiAl-Mo eutectic alloy  interface morphology  corrosion resistance
英文摘要:
      As the solidified microstructures have a significant influence on the corrosion behavior, our aim is to derive the optimum microstructures and electrochemical conditions for producing Mo nanowires. Eutectic microstructures showing coupling growth of NiAl phase and Mo fibers were obtained at growth rates from 10 to 40 μm/s. The fiber size varies from 800 nm to 300 nm, and decreases with the increase of solidification rate. Potentiodynamic polarization studies indicated that NiAl-Mo alloy at a growth rate of 20 μm/s has a better corrosion resistance in 0.1 M HCl solution at room temperature. The electrochemical corrosion behavior of directionally solidfied NiAl-Mo alloys not only depends on fiber size, but also related to the interface morphology. To further analyze the influence of interface morphology on the corrosion behavior, velocity suddenly change experiments were carried out. The microstructure of directionally solidified NiAl-Mo alloy transformed from planar to cellular and dendritic structures as the value of V/V1 increased. The results of potentiodynamic polarization curves revealed that the planar structure has the highest corrosion resistance compared to other mophologies with the same fiber size of Mo-nanowires.
作者单位E-mail
郭俊波 西北工业大学 guojunbo@mail.nwpu.edu.cn 
钟宏 西北工业大学凝固技术国家重点实验室 zhonghong123@nwpu.edu.cn 
刘振鹏 西北工业大学  
杨鲁岩 西北工业大学  
李双明 西北工业大学  
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