| Effects of yttrium on microstructures and properties of Ti- 17Al-27Nb alloy |
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| 作者姓名： | 陈玉勇 司玉锋 孔凡涛 刘志光 李军文 |
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| 作者单位： | School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China，School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China，School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China，School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China，Department of Materials and Chemistry Liaoning Institute of Technology Jinzhou 121001 China |
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| 摘 要： | 1 Introduction With the rapid development in aerospace technology, the aero engine components have to endure larger force and higher temperature due to speed increase of aero-craft. Therefore, more requisitions have to be presented when selecting material…
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| 关 键 词： | Ti-17Al-27Nb 钛合金 显微结构 性能 钇 |
| 收稿时间： | 2005-06-03 |
| 修稿时间： | 2005-12-30 |
Effects of yttrium on microstructures and properties of Ti-17Al-27Nb alloy |
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| CHEN Yu-yong,SI Yu-feng,KONG Fan-tao,LIU Zhi-guang,LI Jun-wen.Effects of yttrium on microstructures and properties of Ti- 17Al-27Nb alloy[J].Transactions of Nonferrous Metals Society of China,2006,16(2):316-320. |
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| Authors: | CHEN Yu-yong SI Yu-feng KONG Fan-tao LIU Zhi-guang LI Jun-wen |
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| Affiliation: | 1. Materials Genome Institute, Shanghai University, 333 Nanchen Rd, Shanghai 200444, China;2. State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin 300354, China |
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| Abstract: | The effects of rare earth yttrium on the microstructures and mechanical properties of Ti-17Al-27Nb alloy were studied. The as-cast microstructures of Ti-17Al-27Nb alloy with 0.85%Y(mole fraction) addition were refined and the tensile elongation also increased. Yttrium in the alloy exists as Y2Al according to the EPMA, XRD analysis and electronegativity differences. Y2Al distributes mainly on the grain boundary. Yttrium is found to improve the tensile strength of Ti-17Al-27Nb alloy due to the grain boundary strengthening. Furthermore, Y2Al distributing in the grain boundary leads to grain refinement by pinning grain growth. This fracture mode has been changed from intergranular fracture for Ti-17Al-27Nb alloy to a mixture of intergranular fracture and transgranular fracture for Ti-17Al-27Nb-0.85Y alloy. The dimples were observed distinctly. Therefore, this yttrium containing alloy shows an excellent plasticity. |
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| Keywords: | Ti-17Al-27Nb alloy yttrium intergranular fracture trangranular fracture microstructure mechanical properties |
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