ABSTRACT In this paper, in situ centrifugal casting was proposed to fabricate Al-26 wt.% Cu-7.8 wt.% Si FG pipe with the density of 3.5 g/cm3 and also the wear resistance of 0.0241g/mm2. The casting mould is preheated to approximately 200°C to avoid chilling effects, segregation, porosity and compensation of the shrinkage of the alloy during the casting. The microstructure results show that the Al2Cu content smoothly decreases from the outer layer to inner layer. Vickers hardness, coefficient of thermal expansion (CTE) and mechanical properties of the present FG pipe are measured to show the significant dependence of the microstructure. Furthermore, the heat treatment of the samples are conducted in boiling water (100°C) for 4.5 h to promote the formations of new Al2Cu particles into the α–Al phase and consequently improve the hardness and CTE of the FG pipe.

中文翻译：

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热处理对AlCu26Si8性能的影响

摘要 在本文中，提出了原位离心铸造制造密度为 3.5 g/cm3，耐磨性为 0.0241g/mm2 的 Al-26 wt.% Cu-7.8 wt.% Si FG 管。铸模预热到大约 200°C，以避免在铸造过程中出现激冷效应、偏析、气孔和补偿合金的收缩。显微组织结果表明Al2Cu含量从外层向内层平滑降低。测量本 FG 管的维氏硬度、热膨胀系数 (CTE) 和机械性能以显示显微结构的显着依赖性。此外，样品的热处理在沸水（100°C）中进行 4 次。