定向凝固<strong>Ti-(43-48)Al-2Cr-2Nb</strong>合金的显微组织和性能

doi:10.11901/1005.3093.2020.028

材料研究学报

2020, Vol. 34

Issue (7): 554-560 DOI: 10.11901/1005.3093.2020.028

研究论文

本期目录 | 过刊浏览

定向凝固Ti-(43-48)Al-2Cr-2Nb合金的显微组织和性能

郭俊杰¹, 王国田²(

), 孟凡英¹

1.张家口职业技术学院张家口 075000
2.黑龙江工程学院哈尔滨 150050

Microstructure and Properties of Ti-(43-48)Al-2Cr-2Nb Alloy Prepared by Directional Solidification

GUO Junjie¹, WANG Guotian²(

), MENG Fanying¹

1.Zhangjiakou Vocational and Technical College, Zhangjiakou 075000, China
2.Heilongjiang Institute of Technology, Harbin 150050, China

引用本文:

郭俊杰, 王国田, 孟凡英. 定向凝固Ti-(43-48)Al-2Cr-2Nb合金的显微组织和性能[J]. 材料研究学报, 2020, 34(7): 554-560.
Junjie GUO, Guotian WANG, Fanying MENG. Microstructure and Properties of Ti-(43-48)Al-2Cr-2Nb Alloy Prepared by Directional Solidification[J]. Chinese Journal of Materials Research, 2020, 34(7): 554-560.

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摘要:

研究了Al含量对冷坩埚定向凝固Ti-(43-48)Al-2Cr-2Nb合金的显微组织和力学性能的影响。结果表明，Ti-(43-48)Al-2Cr-2Nb合金的定向凝固组织主要由α₂相和γ相组成，随着Al含量的提高α₂相逐渐减少而γ相含量提高，且其显微组织片层由以平行片层和45°片层为主的混合片层向垂直混合片层转变；Al含量(48%，原子分数)较高的Ti-(43-48)Al-2Cr-2Nb合金其片层取向与应力方向垂直，具有较高的抗压强度和较低的塑性；Al含量(45%，原子分数)适中的合金其片层取向与应力方向平行，具有较高的强度、室温延伸率和综合性能。

关键词 ：金属材料, TiAl合金, 定向凝固, 显微组织, 片层方向, 力学性能

Abstract：

The effect of Al content on the microstructure and mechanical properties of directionally solidified Ti-(43-48)Al-2Cr-2Nb alloy prepared by cold crucible was investigated. The results show that the directional solidification structure is mainly composed of α₂-phase and γ-phase. With the increase of Al content, the α₂-phase decreases and the γ-phase content increases, while the direction of microstructural lamellae changed from parallel lamellae and 45° lamellae to vertical lamellae; For the alloy with 48%Al (atomic fraction), the orientation of lamellae is perpendicular to the direction of stress, its compressive strength is high, but plasticity is low; For the alloy with 45%Al (atomic fraction), the orientation of lamellae is parallel to the direction of stress, while maintaining high strength, the room temperature elongation is also high, in other word, the comprehensive properties are good.

Key words： metallic materials TiAl alloy directional solidification microstructure lamellar direction mechanical property

收稿日期: 2020-01-18

ZTFLH:

TG244.3

基金资助:国家自然科学基金(51471062);黑龙江工程学院博士基金(2019BJ03)

作者简介: 郭俊杰，女，1981年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.028 或 https://www.cjmr.org/CN/Y2020/V34/I7/554

图1 电磁冷坩埚定向凝固的原理图[22]

图2 二元TiAl合金相图的高温部分

图3 定向凝固Ti-(43-48)Al-2Cr-2Nb合金的X射线衍射谱

图4 抽拉速度为0.6 mm/min的Ti-(43-48)Al-2Cr-2Nb合金定向凝固区的宏观形貌

图5 抽拉速度为0.6 mm/min的Ti-(43-48)Al-2Cr-2Nb合金定向凝固纵剖面的显微组织

图6 Ti-48Al-2Cr-2Nb 合金的界面响应函数示意图

图7 Al含量对抽拉速度为0.6 mm/min的合金片层取向的影响

图8 定向凝固TiAl合金的背散射电子图像

图9 定向凝固Ti-(43-48)Al-2Cr-2Nb合金的压缩试样片层与加载方向的关系示意图

图10 不同Al含量定向凝固Ti-(43-48)Al-2Cr-2Nb合金的压缩应力-应变曲线

表1 抽拉速度为0.6 mm/min的定向凝固Ti-(43-48)Al-2Cr-2Nb合金的压缩性能

图11 Al含量对Ti-(43-48)Al-2Cr-2Nb合金压缩性能的影响

图12 抽拉速度为0.6 mm/min的定向凝固Ti-45Al-2Cr-2Nb合金的压缩试样断口形貌

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