| 箔-纤维-箔法制备Mof/TiAl复合材料的显微组织与性能 |
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| 引用本文： | 陶桂东,李恒奎,徐忠宣,陈志元,孙红亮.箔-纤维-箔法制备Mof/TiAl复合材料的显微组织与性能[J].金属热处理,2020,45(4):22-28. |
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| 作者姓名： | 陶桂东 李恒奎 徐忠宣 陈志元 孙红亮 |
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| 作者单位： | 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 |
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| 摘 要： | 利用箔-纤维-箔法和热压烧结成功制备出Mof/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。
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| 关 键 词： | 钛铝合金 钼纤维 箔-纤维-箔法 热压烧结 |
| 收稿时间： | 2019-09-29 |
Microstructure and properties of Mof/TiAl composites prepared by foil-fiber-foil method |
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| Tao Guidong,Li Hengkui,Xu Zhongxuan,Chen Zhiyuan,Sun Hongliang.Microstructure and properties of Mof/TiAl composites prepared by foil-fiber-foil method[J].Heat Treatment of Metals,2020,45(4):22-28. |
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| Authors: | Tao Guidong Li Hengkui Xu Zhongxuan Chen Zhiyuan Sun Hongliang |
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| Affiliation: | 1. CRRC Qingdao Sifang Co., Ltd., Qingdao Shandong 266031, China; 2. School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu Sichuan 610031, China |
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| Abstract: | Mof/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. |
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| Keywords: | titanium aluminum alloy molybdenum fiber foil-fiber-foil method hot pressing sintering |
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