We put forward a method of fabricating Aluminum(Al)/carbon fibers(CFs) composite sheets by the accumulative roll bonding(ARB) method. The finished Al/CFs composite sheet has CFs and pure Al sheets as sandwich and surf...We put forward a method of fabricating Aluminum(Al)/carbon fibers(CFs) composite sheets by the accumulative roll bonding(ARB) method. The finished Al/CFs composite sheet has CFs and pure Al sheets as sandwich and surface layers. After cross-section observation of the Al/CFs composite sheet, we found that the CFs discretely distributed within the sandwich layer. Besides, the tensile test showed that the contribution of the sandwich CFs layer to tensile strength was less than 11% compared with annealed pure Al sheet. With ex-situ observation of the CFs breakage evolution with-16%,-32%, and-45% rolling reduction during the ARB process, the plastic instability of the Al layer was found to bring shear damages to the CFs. At last, the bridging strengthening mechanism introduced by CFs was sacrificed. We provide new insight into and instruction on Al/CFs composite sheet preparation method and processing parameters.展开更多
In order to improve the wettability and bonding performance of the interface between carbon fiber and aluminum matrix,nickel-and copper-coated carbon fiber-reinforced aluminum matrix composites were fabricated by the ...In order to improve the wettability and bonding performance of the interface between carbon fiber and aluminum matrix,nickel-and copper-coated carbon fiber-reinforced aluminum matrix composites were fabricated by the squeeze melt infiltration technique.The interface wettability,microstructure and mechanical properties of the composites were compared and investigated.Compared with the uncoated fiber-reinforced aluminum matrix composite,the microstructure analysis indicated that the coatings significantly improved the wettability and effectively inhibited the interface reaction between carbon fiber and aluminum matrix during the process.Under the same processing condition,aluminum melt was easy to infiltrate into the copper-coated fiber bundles.Furthermore,the inhibited interface reaction was more conducive to maintain the original strength of fiber and improve the fiber−matrix interface bonding performance.The mechanical properties were evaluated by uniaxial tensile test.The yield strength,ultimate tensile strength and elastic modulus of the copper-coated carbon fiber-reinforced aluminum matrix composite were about 124 MPa,140 MPa and 82 GPa,respectively.In the case of nickel-coated carbon fiber-reinforced aluminum matrix composite,the yield strength,ultimate tensile strength and elastic modulus were about 60 MPa,70 MPa and 79 GPa,respectively.The excellent mechanical properties for copper-coated fiber-reinforced composites are attributed to better compactness of the matrix and better fiber−matrix interface bonding,which favor the load transfer ability from aluminam matrix to carbon fiber under the loading state,giving full play to the bearing role of carbon fiber.展开更多
采用真空压力浸渗法制备体积分数为50% 的2.5D浅交直联Cf/Al复合材料,研究复合材料的显微组织以及室温、高温下弯曲和剪切性能,分析复合材料弯曲和剪切性能的破坏失效机理.结果表明:2.5D浅交直联Cf/Al复合材料经向、纬向显微组织均存在...采用真空压力浸渗法制备体积分数为50% 的2.5D浅交直联Cf/Al复合材料,研究复合材料的显微组织以及室温、高温下弯曲和剪切性能,分析复合材料弯曲和剪切性能的破坏失效机理.结果表明:2.5D浅交直联Cf/Al复合材料经向、纬向显微组织均存在一定的微孔、纤维丝偏聚等缺陷.室温的弯曲强度、弯曲模量、剪切强度分别为268.4 M Pa,75.2 GPa和41.0 M Pa,350℃的弯曲强度、弯曲模量、剪切强度分别为139 M Pa,70.9 GPa和39.2 M Pa,400℃的弯曲强度、弯曲模量、剪切强度分别为97.6 M Pa,68.5 GPa和29.9 M Pa;其中,弯曲失效主要由于内侧面受压导致经向纤维束在压应力作用下被压断,纬向纤维束产生挤压变形;外侧面受拉处随测试温度升高复合材料拉伸破坏现象不明显;而剪切破坏首先出现在基体与纤维束界面损伤处,室温下纤维束被拔出,断口不平齐,350,400℃时纤维束断口呈现45°破坏;经向纤维束屈曲与纬向纤维束挤压变形程度随测试温度升高越来越严重.展开更多
基金Supported by Innovation and Technology Fund (No.ITP/045/19AP)Commercial Research&Development (CRD) Funding Supported by Hong Kong Productivity Council (No.10008787)。
文摘We put forward a method of fabricating Aluminum(Al)/carbon fibers(CFs) composite sheets by the accumulative roll bonding(ARB) method. The finished Al/CFs composite sheet has CFs and pure Al sheets as sandwich and surface layers. After cross-section observation of the Al/CFs composite sheet, we found that the CFs discretely distributed within the sandwich layer. Besides, the tensile test showed that the contribution of the sandwich CFs layer to tensile strength was less than 11% compared with annealed pure Al sheet. With ex-situ observation of the CFs breakage evolution with-16%,-32%, and-45% rolling reduction during the ARB process, the plastic instability of the Al layer was found to bring shear damages to the CFs. At last, the bridging strengthening mechanism introduced by CFs was sacrificed. We provide new insight into and instruction on Al/CFs composite sheet preparation method and processing parameters.
基金The authors are grateful for the financial supports from Joint Fund of the National Natural Science Foundation of China and the China Academy of Engineering Physics(U1630129).
文摘In order to improve the wettability and bonding performance of the interface between carbon fiber and aluminum matrix,nickel-and copper-coated carbon fiber-reinforced aluminum matrix composites were fabricated by the squeeze melt infiltration technique.The interface wettability,microstructure and mechanical properties of the composites were compared and investigated.Compared with the uncoated fiber-reinforced aluminum matrix composite,the microstructure analysis indicated that the coatings significantly improved the wettability and effectively inhibited the interface reaction between carbon fiber and aluminum matrix during the process.Under the same processing condition,aluminum melt was easy to infiltrate into the copper-coated fiber bundles.Furthermore,the inhibited interface reaction was more conducive to maintain the original strength of fiber and improve the fiber−matrix interface bonding performance.The mechanical properties were evaluated by uniaxial tensile test.The yield strength,ultimate tensile strength and elastic modulus of the copper-coated carbon fiber-reinforced aluminum matrix composite were about 124 MPa,140 MPa and 82 GPa,respectively.In the case of nickel-coated carbon fiber-reinforced aluminum matrix composite,the yield strength,ultimate tensile strength and elastic modulus were about 60 MPa,70 MPa and 79 GPa,respectively.The excellent mechanical properties for copper-coated fiber-reinforced composites are attributed to better compactness of the matrix and better fiber−matrix interface bonding,which favor the load transfer ability from aluminam matrix to carbon fiber under the loading state,giving full play to the bearing role of carbon fiber.
文摘采用真空压力浸渗法制备体积分数为50% 的2.5D浅交直联Cf/Al复合材料,研究复合材料的显微组织以及室温、高温下弯曲和剪切性能,分析复合材料弯曲和剪切性能的破坏失效机理.结果表明:2.5D浅交直联Cf/Al复合材料经向、纬向显微组织均存在一定的微孔、纤维丝偏聚等缺陷.室温的弯曲强度、弯曲模量、剪切强度分别为268.4 M Pa,75.2 GPa和41.0 M Pa,350℃的弯曲强度、弯曲模量、剪切强度分别为139 M Pa,70.9 GPa和39.2 M Pa,400℃的弯曲强度、弯曲模量、剪切强度分别为97.6 M Pa,68.5 GPa和29.9 M Pa;其中,弯曲失效主要由于内侧面受压导致经向纤维束在压应力作用下被压断,纬向纤维束产生挤压变形;外侧面受拉处随测试温度升高复合材料拉伸破坏现象不明显;而剪切破坏首先出现在基体与纤维束界面损伤处,室温下纤维束被拔出,断口不平齐,350,400℃时纤维束断口呈现45°破坏;经向纤维束屈曲与纬向纤维束挤压变形程度随测试温度升高越来越严重.
