| 定向凝固TiAl-Nb合金的显微组织控制与力学性能(英文) |
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| 引用本文： | 丁贤飞,张来启,林均品,何建平,尹佳,陈国良.定向凝固TiAl-Nb合金的显微组织控制与力学性能(英文)[J].中国有色金属学会会刊,2012,22(4):747-753. |
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| 作者姓名： | 丁贤飞 张来启 林均品 何建平 尹佳 陈国良 |
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| 作者单位： | 北京科技大学国家材料服役安全科学中心;北京科技大学新金属材料国家重点实验室 |
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| 基金项目： | Project (2011CB605500) supported by the National Basic Research Program of China;Project (FRF-MP-10-005B) supported by the Fundamental Research Funds for the Central Universities,China |
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| 摘 要： | 合金的片层组织。由于合金定向凝固过程中发生完全包晶转变,在枝晶固液生长界面条件下,即可获得片层方向与生长方向成0°或45°夹角的多孪晶合成晶体(PST)。在适当的生长条件下,当片层方向与生长方向平行的片层团在二次定向凝固过程中发生籽晶作用时,可以控制PST晶体内部的片层方向仅与生长方向平行。合金中低含量B的加入会导致非包晶α相的生长,从而不利于控制片层方向。定向凝固TiAl-Nb合金中存在较大的氧化钇颗粒与条状硼化物颗粒,导致其室温拉伸延伸率仅接近2%。
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| 关 键 词： | TiAl合金 定向凝固 包晶转变 片层方向 多孪晶合成晶体 力学性能 |
| 收稿时间： | 9 September 2011 |
Microstructure control and mechanical properties of directionally solidified TiAl-Nb alloys |
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| DING Xian-fei,ZHANG Lai-qi,LIN Jun-pin,HE Jian-ping,YIN Jia,CHEN Guo-liang.Microstructure control and mechanical properties of directionally solidified TiAl-Nb alloys[J].Transactions of Nonferrous Metals Society of China,2012,22(4):747-753. |
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| Authors: | DING Xian-fei ZHANG Lai-qi LIN Jun-pin HE Jian-ping YIN Jia CHEN Guo-liang |
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| Affiliation: | 1.National Center for Materials Service Safety,University of Science and Technology Beijing,Beijing 100083,China;2.State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China |
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| Abstract: | The double directional solidification(DS) technique was developed to control the lamellar microstructures in primary β TiAl-Nb alloys.Polysynthetically twinned(PST) crystals with lamellar boundaries parallel to or inclined 45o to the growth direction were achieved due to the complete peritectic transformation during directional solidification of the alloys with the dendritic solid/liquid interface.The PST crystals with aligned lamellar boundaries only parallel to the growth direction were produced when lamellar grains with lamellar boundaries in the same orientation were seeded by themselves under appropriate growth conditions.Low boron addition is harmful to align the lamellar orientation because of the growth of non-peritectic α phase.Due to the larger yttria particles and boride ribbons in the directionally solidified TiAl-Nb alloys,the tensile plastic elongations of the alloys are only close to 2%. |
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| Keywords: | titanium aluminides directional solidification peritectic transformation lamellar orientation polysynthetically twinned crystals mechanical properties |
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