箔-纤维-箔法制备Mof/TiAl复合材料的显微组织与性能

doi:10.13251/j.issn.0254-6051.2020.04.005

金属热处理 ›› 2020, Vol. 45 ›› Issue (4): 22-28.DOI: 10.13251/j.issn.0254-6051.2020.04.005

箔-纤维-箔法制备Mo_f/TiAl复合材料的显微组织与性能

陶桂东¹, 李恒奎¹, 徐忠宣¹, 陈志元², 孙红亮²

1. 中车青岛四方机车车辆股份有限公司, 山东青岛 266031;
2. 西南交通大学材料科学与工程学院, 四川成都 610031

收稿日期:2019-09-29 出版日期:2020-04-25 发布日期:2020-05-08
通讯作者: 孙红亮,副教授,E-mail:sunhlcd@163.com
作者简介:陶桂东(1974—),男,教授级高工,学士,主要从事动车组总体设计,E-mail:xuzhongxuan@cqsf.com
基金资助:
国家重点研发计划(2016YFB1200505)

Microstructure and properties of Mo_f/TiAl composites prepared by foil-fiber-foil method

Tao Guidong¹, Li Hengkui¹, Xu Zhongxuan¹, Chen Zhiyuan², Sun Hongliang²

1. CRRC Qingdao Sifang Co., Ltd., Qingdao Shandong 266031, China;
2. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu Sichuan 610031, China

Received:2019-09-29 Online:2020-04-25 Published:2020-05-08

摘要/Abstract

摘要： 利用箔-纤维-箔法和热压烧结成功制备出Mo_f/Ti48Al复合材料,并分析了Mo纤维对TiAl合金显微组织和力学性能的影响。结果表明,通过635 ℃,3 MPa,10 h+680 ℃,3 MPa,4 h的两步低温热压,箔材中的Al完全反应完,TiAl箔叠层材料形成致密的Ti/TiAl₃板材,合金致密基本无孔洞。再通过1200 ℃,36 h的高温退火,Ti与TiAl₃在高温下继续反应,形成γ-TiAl、α-Ti₃Al相。高温退火后的钼纤维与基体合金发生了扩散反应,形成了扩散区域,此区域内主要相组成为TiMo、AlMo₃,钼纤维与基体合金通过扩散紧密结合在一起,界面未发现孔洞和因应力形成的裂纹。相比于未添加钼纤维的合金,添加10vol%钼纤维的复合材料抗弯性能有明显的提高,钼纤维在合金中起到了强韧化作用。

关键词: 钛铝合金, 钼纤维, 箔-纤维-箔法, 热压烧结

Abstract: Mo_f/Ti48Al composite was successfully prepared by foil-fiber-foil method and hot pressing sintering, and the effects of Mo fiber on the microstructure and mechanical properties of the TiAl alloy were analyzed. The results show that through the two-step low temperature hot pressing of 635 ℃, 3 MPa for 10 h+680 ℃, 3 MPa for 4 h, the Al has fully reacted and the TiAl foil laminated material forms a dense Ti/TiAl₃ plate nearly void-free. Then in the high temperature reaction annealing at 1200 ℃ for 36 h, Ti and TiAl₃ continue to react to form γ-TiAl and α-Ti₃Al phases. The diffusion reaction of Mo fiber with matrix alloy after high temperature annealing forms a diffusion region, in which the main phases are TiMo and AlMo₃. The Mo fiber and matrix alloy are closely combined through diffusion, and there are no voids or cracks formed in the interface. Compared with the alloy without adding Mo fiber, the flexural properties of the composite with 10vol% Mo fiber are obviously improved, and the Mo fiber plays a toughening role in the alloy.

Key words: titanium aluminum alloy, molybdenum fiber, foil-fiber-foil method, hot pressing sintering

中图分类号:

陶桂东, 李恒奎, 徐忠宣, 陈志元, 孙红亮. 箔-纤维-箔法制备Mo_f/TiAl复合材料的显微组织与性能[J]. 金属热处理, 2020, 45(4): 22-28.

Tao Guidong, Li Hengkui, Xu Zhongxuan, Chen Zhiyuan, Sun Hongliang. Microstructure and properties of Mo_f/TiAl composites prepared by foil-fiber-foil method[J]. Heat Treatment of Metals, 2020, 45(4): 22-28.

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箔-纤维-箔法制备Mo_f/TiAl复合材料的显微组织与性能

Microstructure and properties of Mo_f/TiAl composites prepared by foil-fiber-foil method

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箔-纤维-箔法制备Mof/TiAl复合材料的显微组织与性能

Microstructure and properties of Mof/TiAl composites prepared by foil-fiber-foil method

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箔-纤维-箔法制备Mo_f/TiAl复合材料的显微组织与性能

Microstructure and properties of Mo_f/TiAl composites prepared by foil-fiber-foil method