Abstract Al matrix composites reinforced with Cu-coated pitch-based carbon fibres (Al/Cu-CFs) were fabricated, using a novel combination of rheocasting and equal channel angular extrusion (ECAE) techniques, in order to exploit the thermal conductivity (K) of the material. Rheocasting allowed the introduction and dispersion of Cu-CFs within the Al3Mg matrix. The subsequent ECAE processing reduced the porosity of the composites from 3 to 0.03% and induced a high degree of fibre alignment within the matrix, although considerable damage to the fibres occurred during this processing step. After 6 ECAE passes, in which the billet orientation remained constant, the composite with the highest degree of fibre alignment show a thermal conductivity (K) improvement of ~20% with respect to the rheocast composite. The improvement is due to porosity reduction, improved fibre alignment and forced intimate contact of clean CF surfaces with the matrix.

中文翻译：

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碳纤维增强铝金属基复合材料的加工、结构与热导率相关性

摘要 使用流变铸造和等通道角挤压 (ECAE) 技术的新组合制造了用 Cu 涂层沥青基碳纤维 (Al/Cu-CFs) 增强的铝基复合材料，以利用热导率 (K)的材料。流变铸造允许在 Al3Mg 基体中引入和分散 Cu-CF。随后的 ECAE 加工将复合材料的孔隙率从 3% 降低到 0.03%，并在基体中引起了高度的纤维排列，尽管在此加工步骤中对纤维造成了相当大的损坏。经过 6 次 ECAE 后，其中坯料取向保持不变，具有最高纤维排列度的复合材料的热导率 (K) 相对于流变浇铸复合材料提高了约 20%。改善是由于孔隙率降低，