Abbreviation (ISO4): Journal of Materials Engineering
Editor in chief: Xiangbao CHEN
Journal of Materials Engineering >
Effect of carbon fiber and diffusion layer thickness on tissue properties of Al-Mg-Ti laminated composites
Received date: 2023-04-04
Revised date: 2023-05-18
Online published: 2024-03-10
Carbon fiber-reinforced Al-Mg-Ti laminated composites were prepared by vacuum hot-press diffusion technique and "foil-fiber-foil" method using 1060 pure aluminum, TC4 titanium alloy, AZ31 magnesium alloy and nickel-plated carbon fiber woven fabric as raw materials. The effect of Al-Mg diffusion layer thickness on the material tissue properties was analyzed by controlling the Al-Mg holding time, and the strengthening mechanism of carbon fiber was discussed. The phase composition, element distribution and crack extension morphology of the composites were analyzed by X-ray diffraction (XRD), energy spectrum (EDS) analyzer and scanning electron microscopy (SEM), and the flexural strength and impact toughness of the composites were tested. The results show that the thickness of diffusion layer of carbon fiber-reinforced Al-Mg-Ti laminated composites increases with the increase of holding time, and the mechanical properties show a trend of increasing and then decreasing, and the carbon fiber absorbs a large amount of fracture energy through fiber debonding, fiber pull-out and fiber splitting, which plays a significant toughening effect. The mechanical properties of the composites are optimal at the hot pressing temperature of 640 ℃ for 2 h for Al-Ti and 440 ℃ for 8 h for Al-Mg, with flexural strength of 380 MPa and impact toughness of 26.2 J/cm2, which are increased by 10.8% and 30.3% respectively, relative to the matrix flexural strength and impact toughness.
Zhaoxia SUN , Qian GUO , Linggang MENG , Dong JING , Liguo GENG , Weiping ZHANG , Xingguo ZHANG . Effect of carbon fiber and diffusion layer thickness on tissue properties of Al-Mg-Ti laminated composites[J]. Journal of Materials Engineering, 2023 , 51(11) : 79 -86 . DOI: 10.11868/j.issn.1001-4381.2023.000237
表1 原材料化学成分(质量分数/%)Table 1 Chemical compositions of raw materials (mass fraction/%) |
Raw material | Ti | Al | Mg | Fe | Zn |
---|---|---|---|---|---|
TC4 | 89.42 | | 0.30 | ||
1060 | 0.03 | 99.60 | | 0.35 | 0.10 |
AZ31 | | 95.54 | 0.45 | 0.67 |
图2 碳纤维增强Al-Mg-Ti微叠层复合材料热压堆叠顺序 (a)铝-钛-碳纤维;(b)铝-钛-镁-碳纤维Fig.2 Hot pressing stacking sequence of carbon fiber-reinforced Al-Mg-Ti laminated composites (a)Al-Ti-Cf;(b)Al-Ti-Mg-Cf |
表3 试样分步热压保温时间Table 3 Holding time of two-step hot pressing of specimen |
Sample | First step of hot-press holding time/h | Second step of hot- press holding time/h |
---|---|---|
1 | 2 | |
2 | 2 | |
3 | 2 | |
4 | 2 | |
5 | 2 | 10 |
6 | 2 | 14 |
图4 不同状态碳纤维形貌图 (a)原编织碳纤维(左)和电镀镍后的编织碳纤维(右)的宏观形貌;(b)原碳纤SEM图像;(c)除胶处理后碳纤维 SEM 图像;(d)电镀镍后碳纤维 SEM 图像Fig.4 Carbon fiber morphologies in different states (a)macroscopic morphologies of the original woven Cf (left) and the woven Cf after Ni plating(right);(b)SEM image of the original Cf;(c)SEM image of the Cf after debinding treatment;(d)SEM image of the Cf after Ni plating |
图6 碳纤维增强Al-Mg-Ti微叠层复合材料显微组织形貌图(a)碳纤维增强Al-Mg-Ti微叠层复合材料典型显微组织形貌;(b)Al-Ti结合处微观组织图;(c)Al-Mg结合面EDS点分析;(d)Al-CF结合面处EDS点分析Fig.6 Microstructures of carbon fiber reinforced Al-Mg-Ti laminated composites(a)typical microstructure morphology of carbon fiber-reinforced Al-Mg-Ti laminated composites;(b)microstructure of Al-Ti bond;(c)EDS point analysis of Al-Mg bond;(d)EDS point analysis of Al-CF bond |
表4 图6中不同点EDS能谱分析结果(原子分数/%)Table 4 Results of EDS analysis at different points in Fig.6(atom fraction/%) |
Point | Al | Mg | Ni | C | Phase |
---|---|---|---|---|---|
1 | 64.32 | 35.48 | Al3Mg2 | ||
2 | 62.84 | 37.16 | Al3Mg2 | ||
3 | 46.62 | 53.38 | Al12Mg17 | ||
4 | 71.19 | 27.79 | | Al3Ni | |
5 | | | 99.63 | C |
表5 铝镁热压不同保温时间下 Al-Mg扩散层厚度Table 5 Thickness of Al-Mg diffusion layer under different holding time of Al-Mg hot pressing |
Sample | Second step of hot-press holding time/h | Thickness of AZ31 layer/μm | Thickness of Al12Mg17 layer/μm | Thickness of Al3Mg2layer/μm | Total thickness of diffusion layer/μm |
---|---|---|---|---|---|
1 | | 404.9 | 24.7 | | |
2 | | 360.0 | 46.3 | | 136.3 |
3 | | 331.6 | 57.0 | 103.7 | 160.7 |
4 | | 307.5 | 64.1 | 111.3 | 175.4 |
5 | 10 | 263.0 | 75.4 | 123.6 | 199.0 |
6 | 14 | 191.4 | 91.4 | 161.7 | 253.1 |
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