元素Nb、Hf、Zr对γ-TiAl合金抗氧化性能的影响

材料导报

2021, Vol. 35

Issue (Z1): 374-377

金属与金属基复合材料

元素Nb、Hf、Zr对γ-TiAl合金抗氧化性能的影响

赖旭平¹, 李天方¹, 刘瑞², 孙红亮²

1 海军装备部,成都 610036
2 西南交通大学材料科学与工程学院,成都 610031

Effect of Nb, Hf and Zr on Oxidation Resistance of γ-TiAl Alloy

LAI Xuping¹, LI Tianfang¹, LIU Rui², SUN Hongliang²

1 Naval Equipment Department, Chengdu 610036, China
2 School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China

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摘要在等原子比的γ-TiAl基金属间化合物的基础上添加Nb、Hf、Zr元素,熔炼了3种合金,研究了这3种合金在静止空气中的1 600 ℃高温升温过程和700 ℃、800 ℃、850 ℃低温下恒温20 h的氧化行为。结果表明:合金4Nb-4Zr、合金4Nb-4Hf和合金8Nb在1 600 ℃升温氧化过程中都存在一个孕育期,温度上升至1 000 ℃以上才开始出现急速氧化的趋势。而700 ℃、800 ℃和850 ℃恒温氧化过程中不存在孕育期,氧化曲线呈现抛物线型。计算和修正了三种合金分别在700 ℃、800 ℃和850 ℃下氧化抛物线常数K_p值。三种合金氧化后氧化膜主要由致密的Al₂O₃和疏松的TiO₂组成。合金元素主要通过影响氧化膜中致密的Al₂O₃的量来控制合金的抗氧化性。元素Hf对提高TiAl合金中Al的活度作用明显,合金氧化膜中Al₂O₃量最多,合金抗氧化性最佳。元素Nb次之,元素Zr最差。

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关键词: Nb Hf Zr TiAl合金高温氧化抗氧化性

Abstract: Three kinds of alloys were melted by adding Nb, Hf and Zr elements on the basis of equal atomic ratio γ-TiAl based intermetallic compounds. The oxidation behavior of the three alloys in still air at 1 600 ℃ and at 700 ℃, 800 ℃ and 850 ℃ for 20 h was studied. The results show that there is an incubation period in the oxidation process of 4Nb-4Zr, 4Nb-4Hf and 8Nb at 1 600 ℃, and the rapid oxidation begins when the temperature rises above 1 000 ℃. However, there is no incubation period in the isothermal oxidation process at 700 ℃, 800 ℃ and 850 ℃, and the oxidation curve is parabolic. The parabolic constants K_p of the three alloys at 700 ℃, 800 ℃ and 850 ℃ were calculated and corrected. The oxide films of the three alloys are mainly composed of dense Al₂O₃ and loose TiO₂. Alloying elements control the oxidation resistance of the alloy mainly by affecting the amount of dense Al₂O₃ in the oxide film. Hf plays an important role in improving the activity of Al in TiAl alloy. The amount of Al₂O₃ in the oxide film is the most, and the oxidation resistance of the alloy is the best. Nb is the second, Zr is the worst.

Key words: Nb Hf Zr TiAl alloy high temperature oxidation oxidation resistance

发布日期: 2021-07-16

ZTFLH:

TG146

基金资助: 国家重点研发计划(2016YFB1200505)

通讯作者: sunhlcd@163.com

作者简介: 孙红亮,男,博士,副教授。主要从事钛铝合金的基础研究,热等静压、热压等粉末冶金的工艺研究工作。先后主持多项相关领域的国家自然科学基金,国家重点研发项目及横向项目。以第一作者或者通讯作者在Journal of Alloys and Compounds, Materials Research Innovations,Rare Me-tals, Materials & Manufacturing Processes等国际期刊发30余篇表论文,并担任多项国际期刊同行审阅人。申请专利近10项。赖旭平,海装西安局工程师,1998 年9月至2002年7月在哈尔滨工程大学获得材料科学与工程专业学士学位,毕业后一直从事核动力工程项目管理和质量监督工作,参与多项国家重点项目研发,特别是涉核领域系统设计、设备研制、材料研发等方面,发表文章10余篇,获国防科技进步奖三等奖一项,立三等功一次,多次享受高新工程津贴。

引用本文:

赖旭平, 李天方, 刘瑞, 孙红亮. 元素Nb、Hf、Zr对γ-TiAl合金抗氧化性能的影响[J]. 材料导报, 2021, 35(Z1): 374-377.
LAI Xuping, LI Tianfang, LIU Rui, SUN Hongliang. Effect of Nb, Hf and Zr on Oxidation Resistance of γ-TiAl Alloy. Materials Reports, 2021, 35(Z1): 374-377.

链接本文:

http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2021/V35/IZ1/374

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