Preparation and mechanical properties of graphene reinforced-Al7075 composite by semi-solid sintering
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摘要: 通过球磨混粉+半固态烧结法成功制备出质量分数为0.5%的石墨烯/7075铝基复合材料，通过扫描电子显微镜、能谱分析仪和室温拉伸力学性能测试等手段，对石墨烯/7075铝基复合材料的显微组织及力学性能进行了研究。结果表明：复合材料中的石墨烯纳米片均匀的分散在7075铝合金基体中，相比于未添加石墨烯的7075铝合金基体，复合材料的密度有所下降，维式硬度和抗拉强度则分别提高了14%和32%，延伸率无明显变化。Abstract: Graphene reinforced-Al7075 composite was successfully prepared through ball milling mixing powder and semi solid sintering method. The influences of graphene on the microstructures and mechanical properties of Al7075 composite were investigated by scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and static tensile tests. The results show that, the graphene nanoflakes are well dispersed in Al7075 matrix. Compared to the Al7075 matrix without the addition of graphene, the density of graphene reinforced-Al7075 composite decreases, the Vickers hardness and tensile strength increase by 14% and 32%, respectively, and the elongation shows a slight drop.
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Key words:
- aluminum matrix composite /
- semi-solid sintering /
- graphene /
- mechanical properties
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图 1 7075铝合金粉体（a）和石墨烯纳米片（b）的扫描电子显微组织形貌
Figure 1. SEM images of 7075Al alloy powders (a) and grapheme nanoflakes (b)
图 2 半固态烧结7075铝基复合材料显微组织形貌与能谱分析：（a）未添加石墨烯Al7075铝合金；（b）添加质量分数0.5%石墨烯/7075铝基复合材料（低倍）；（c）添加质量分数0.5%石墨烯/7075铝基复合材料（高倍）；（d）A点处能谱分析
Figure 2. SEM images and energy dispersive spectrometer (EDS) analysis of graphene reinforced-Al7075 composite by semi-solid sintering: (a) Al7075 composite without graphene; (b) Al7075 composite with 0.5% graphene by mass (low magnification); (c) Al7075 composite with 0.5% graphene by mass (high magnification); (d) EDS analysis at point A
图 3 未添加石墨烯Al7075铝合金和添加质量分数0.5%石墨烯/7075铝基复合材料的压实密度
Figure 3. Density of Al7075 alloy without graphene and Al7075 composite with 0.5% graphene by mass
图 4 未添加石墨烯Al7075铝合金和添加质量分数0.5%石墨烯/7075铝基复合材料的维氏硬度
Figure 4. Vickers hardness of Al7075 alloy without graphene and Al7075 composite with 0.5% graphene by mass
图 5 未添加石墨烯Al7075铝合金和添加质量分数0.5%石墨烯/7075铝基复合材料的抗拉强度与延伸率
Figure 5. Tensile strength and elongation of Al7075 alloy without graphene and Al7075 composite with 0.5% graphene by mass
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