Ti-45Al-8Nb-<i>x</i>Hf合金组织性能与高温氧化行为

王威

doi:10.7513/j.issn.1004-7638.2024.05.012

Ti-45Al-8Nb-xHf合金组织性能与高温氧化行为

doi: 10.7513/j.issn.1004-7638.2024.05.012

王威

黑龙江工程学院材料与化学工程学院, 黑龙江哈尔滨 150050

基金项目: 大学生创新创业训练计划项目（S202311802027）；大学生创新创业训练计划项目（202211802109）；黑龙江省高等教育学会2023年高等教育研究课题项目（23GJYBF076）。

详细信息

作者简介:
王威，1978年出生，男，黑龙江哈尔滨人，硕士，讲师，主要从事轻质合金材料制备与研究工作，E-mail：wwacme@126.com

中图分类号: TF823,TG146.4
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- 文章访问数: 293
- HTML全文浏览量: 86
- PDF下载量: 17
- 被引次数: 0
出版历程
- 收稿日期: 2024-03-28
- 网络出版日期: 2024-10-30
- 刊出日期: 2024-10-30

Microstructures, properties and high-temp oxidation behaviors of Ti-45Al-8Nb-xHf alloys

Wang Wei

College of Materials and Chemical Engineering, Heilongjiang Institute of Technology, Harbin 150050, Heilongjiang, China

摘要

摘要: 采用氩气保护真空感应熔炼工艺制备了Ti-45Al-8Nb-xHf (x=0.5、1.0、1.5、2) 合金，利用金相显微镜(OM)、扫描电镜(SEM)、能谱仪 (EDS)、X射线衍射仪(XRD)、万能试验机等研究了合金显微组织、压缩性能和抗氧化性能。结果表明，Hf元素含量的增加能够保持和细化合金显微组织，延缓高温下组织的转变，使合金抗压强度和压缩率分别提高到1923 MPa和25.7%，升幅30%以上，具有显著强化效应。合金在1000 ℃氧化时具有稳定TiO₂+Nb₂O₅的氧化亚层，以平直界面氧化生长，氧化扩散层尺寸稳定小于85 μm，氧化质量呈线性变化，氧化速率曲线下降并最终达到稳定氧化阶段。适量Hf的添加有利于强化合金的力学性能和高温抗氧化性能。
- Ti-45Al-8Nb-xHf /
- 力学性能 /
- 显微组织 /
- 抗氧化性
Abstract: Ti-45Al-8Nb-xHf (x=0.5, 1.0, 1.5, 2) alloys were prepared by argon-protected vacuum induction melting process, and the microstructure, compressive properties and antioxidant properties of the alloys were investigated by using optical microscope (OM), scanning electron microscope (SEM), energy spectrum spectrometry (EDS), X-ray diffraction (XRD) and universal testing machine. The results show that the increase of Hf element content can maintain and refine the microstructure of the alloys, delay the transformation of the tissue at high temperature, and increase the compressive strength and compression ratio of the alloys to 1923 MPa and 25.7%, respectively, with an increase of more than 30%, which has a significant strengthening effect. The alloys have a stable TiO₂+Nb₂O₅ oxide sublayer when oxidized at 1000 ℃, which grows by oxidation at a flat interface, the size of the oxide diffusion layer is stable less than 85 μm, the oxidized quality changes linearly, and the oxidation rate curve decreases and finally reaches the stable oxidation stage. The addition of appropriate amount of Hf is conducive to strengthening the mechanical properties of the alloys and high-temperature oxidation resistance.
- Ti-45Al-8Nb-xHf /
- mechanical properties /
- microstructure /
- oxidation resistance

HTML全文

图 1 Ti-45Al-8Nb-$x $Hf合金铸态显微组织

(a) Ti-45Al-8Nb-0.5Hf；(b) Ti-45Al-8Nb-1.0Hf；(c) Ti-45Al-8Nb-1.5Hf；(d) Ti-45Al-8Nb-2.0Hf

Figure 1. Microstructures of as-cast Ti-45Al-8Nb-$x $Hf alloys

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图 2 2.0% Hf合金晶界结构与不同Hf含量的XRD谱

(a) 2.0% Hf合金晶界结构；(b) XRD分析

Figure 2. 2.0% Hf alloy boundary microstructure and XRD pattern of xHf

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图 3 Ti-45A1-8Nb-$x $Hf合金1 000 ℃/25 h显微组织

(a) Ti-45Al-8Nb-0.5Hf ；(b) Ti-45Al-8Nb-1.0Hf ；(c) Ti-45Al-8Nb-1.5Hf ；(d) Ti-45Al-8Nb-2.0Hf

Figure 3. Microstructures of Ti-45A1-8Nb-$x $Hf alloys at 1 000 ℃ for 25 h

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图 4 Ti-45Al-8Nb-$x $Hf合金室温压缩性能与硬度

(a) 压缩应力-应变曲线；(b) 强度和压缩率；(c) 硬度

Figure 4. Room temperature compression properties and hardness of Ti-45Al-8Nb-$x $Hf alloys

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图 5 Ti-45Al-8Nb-xHf合金1000 ℃/75 h显微组织

(a) Ti-45Al-8Nb-0.5Hf；(b) Ti-45Al-8Nb-1.0Hf；(c) Ti-45Al-8Nb-1.5Hf；(d) Ti-45Al-8Nb-2.0Hf

Figure 5. Microstructures of Ti-45Al-8Nb-xHf alloys at 1 000 ℃ for 75 h

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图 6 1000 ℃不同时间的Ti-45Al-8Nb-2.0Hf 合金氧化截面

(a) 25 h，1 000 ℃；(b) 50 h，1 000 ℃；(a) 75 h，1 000 ℃

Figure 6. SEM images of Ti-45Al-8Nb-2.0Hf alloy with different oxidation times at 1000 ℃

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图 7 1000 ℃氧化Ti-45Al-8Nb-2.0Hf 合金氧化层截面EDS元素分布和氧化表面XRD

(a) 氧化层截面EDS元素分布；(b) 氧化表面XRD

Figure 7. Elemental distribution of oxide layer cross section and XRD of oxidized surface of Ti-45Al-8Nb-2.0Hf alloy at 1 000 ℃

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图 8 不同Hf含量合金氧化曲线

(a) 氧化动力曲线；(b) 氧化速率曲线；(c) 氧化拟合曲线

Figure 8. Oxidation curves of Ti-45Al-8Nb-xHf

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表 1 TiAl基多元合金铸锭化学成分

Table 1. Chemical composition of test alloys with different Hf contents %

Al	Nb	xHf	Ti
45.0	8.0	0.5、1.0、1.5、2.0	Bal.

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表 2 合金1000 ℃氧化动力学参数

Table 2. Kinetic parameters of oxidation at 1000 ℃

合金	n	k_n	R²	t/h
Ti-45Al-8Nb-0.5Hf	1.659	0.602	0.9963	0～100
Ti-45Al-8Nb-1.0Hf	1.640	0.609	0.9772	0～100
Ti-45Al-8Nb-1.5Hf	1.944	0.522	0.9947	0～100
Ti-45Al-8Nb-2.0Hf	1.914	0.514	0.9985	0～100

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