摘要本文研究了高温合金33Ni-32Al-28Cr-3Mo-4Ti在810℃ 和910℃空气中的高温氧化行为。通过扫描电镜和X射线衍射仪对试样表面氧化物的分析，可得试样表面较为平坦的部位为Cr2O3，Al2O3的氧化膜，其中Cr2O3含量较高，而颗粒状物为TiO2。利用所得能图谱和表面形貌照片分析研究了氧化产物的微观形貌和物质组成，并且根据实验结果和结合已有理论讨论了33Ni-32Al-28Cr-3Mo-4Ti合金的氧化产物形成原因和氧化物对基体氧化的影响。实验结果表明该合金表面生成Al2O3、Cr2O3、TiO2等氧化物，Ti的氧化物生成较快而且Ti含量少导致生成了零星的大颗粒对氧化膜的生长影响不大，而Cr、Al分别在CrMo、NiAl相区表面分别生成Cr2O3、Al2O3氧化膜，由于两种氧化物晶体之间形成晶界，氧气可以在晶界处形成短路扩散，进而与基体表面金属结合，使合金继续向内氧化。58000

毕业论文关键词：高温合金；高温氧化；氧化物；合金元素

Study on high temperature oxidation behavior of NiAl eutectic alloy

In this paper,the high temperature oxidation behavior of 33Ni-32Al-28Cr-3Mo-4Ti at 810℃ and 910℃ in air was studied.By scanning electron microscope and X ray diffraction analysis of the sample surface oxide,can get the sample surface is relatively flat parts for Al2O3,Cr2O3 oxide film,which Cr2O3 content is higher,and the granular material

is TiO2.The income can profiles and surface morphology images analysis of oxidation products of micro morphology and composition,and according to the experimental results and combined with the existing theory discussed oxidation products 33Ni-32Al-28Cr-3Mo-4Ti alloy forming reason and oxide on the substrate oxidation effect.Experimental results show that the alloy is formed on the surface of Al2O3,Cr2O3 and TiO2 oxides,titanium oxides generated faster and Ti content resulting in less generated sporadic large particles of the oxide film growth of small,and Cr,Al respectively in CrMo and NiAl phase surface area were generated Cr2O3,Al2O3 films,due to the grain boundaries formed between two kinds of oxide crystals,oxygen can form short circuit diffusion at the grain boundaries and with the metal substrate surface combined with,the alloy is inward oxidation.

Keywords: high temperature alloy; High temperature oxidation; oxide; alloying element

目录

1.绪论 1

1.1 高温合金发展背景 1

1.2 NiAl高温合金发展状况 1

1.3 NiAl高温合金的性质 2

1.3.1 NiAl 的物理性质 2

1.3.2 NiAl 合金超塑性 3

1.3.3 NiAl 合金韧脆转变 4

1.3.4 NiAl合金压缩性能 5

1.4 显微组织 5

1.5 NiAl高温合金的氧化 6

1.5.1 氧化动力学 6

1.5.2 氧化机理 8

1.5.3 氧化膜的形成 8

1.5.4 氧化膜的组成 9

1.6 课题目的与意义 10

2实验方案 11

2.1 实验方法 11

2.2 实验材料和仪器 11

2.2.1实验材料和仪器 11

2.2.2 实验主要仪器简介 11

2.3实验过程 14

2.3.1试样准备工作