| Effect of Yttrium Addition on Microstructures and Room Temperature Tensile Properties of Ti-47Al Alloy |
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| 作者姓名： | 李宝辉 孔凡涛 陈玉勇 |
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| 作者单位： | School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | The microstructures and room temperature tensile properties of a series of Ti-47Al-xY （x = 0%, 0.1%, 0.3%, 0.5%, 0.7% and 1.0%（atom fraction）） were investigated systemically. Results show that both the grain size and lamellar spacing decrease remarkably with the increase of Y content. When the content of Y is greater than 0.1%, most of the Y elements accumulate along the grain boundaries and some fine particles are uniformly dispersed within the grains in the form of YAl2 compound because of the low solubility and segregation of Y in TiAl alloys. Grain-boundary seg- regation of Y element is more prominent with the increase of Y addition. Good tensile properties are obtained when Y addition ranges from 0.3 % to 0.5 %. The refinement of grain and lamellar structures and dispersion of YAl2 within the grains contribute to the improvement of tensile properties. On the other hand, for high Y-added alloys （over 0.5% Y）, tensile properties are obviously deteriorated due to brittle cleavage fracture of the coarse YAl2 network.
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| 关 键 词： | TiAl 钛合金 稀土 钇 显微结构 室温 拉伸性能 |
| 文章编号： | 1002-0721（2006）03-0352-05 |
| 收稿时间： | 2005-06-07 |
| 修稿时间： | 2006-02-28 |
Effect of Yttrium Addition on Microstructures and Room Temperature Tensile Properties of Ti-47 Al Alloy |
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| Baohui , Fantao Kong,Yuyong Chen.Effect of Yttrium Addition on Microstructures and Room Temperature Tensile Properties of Ti-47Al Alloy[J].Journal of Rare Earths,2006,24(3):352-356. |
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| Authors: | Baohui Fantao Kong Yuyong Chen |
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| Affiliation: | aSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | The microstructures and room temperature tensile properties of a series of Ti-47Al-xY (χ = 0%, 0.1%,0.3 %, 0.5 %, 0.7 % and 1.0 % (atom fraction) ) were investigated systemically. Results show that both the grain size and lamellar spacing decrease remarkably with the increase of Y content. When the content of Y is greater than 0.1%,most of the Y elements accumulate along the grain boundaries and some fine particles are uniformly dispersed within the grains in the form of YAl2 compound because of the low solubility and segregation of Y in TiAl alloys. Grain-boundary segregation of Y element is more prominent with the increase of Y addition. Good tensile properties are obtained when Y addition ranges from 0.3 % to 0.5 %. The refinement of grain and lamellar structures and dispersion of YAl2 within the grains contribute to the improvement of tensile properties. On the other hand, for high Y-added alloys (over 0.5 % Y), tensile properties are obviously deteriorated due to brittle cleavage fracture of the coarse YAl2 network. |
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| Keywords: | TiAl alloy microstructure property yttrium rare earths |
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