Al–Bi immiscible alloy is of particular interest as potential self-lubricating wear materials with a homogeneous distribution of minority phase. However, it is difficult to obtain a homogeneous microstructure by conventional casting methods due to liquid phase separation of Al–Bi immiscible alloy. We have developed a new strategy to restrain liquid phase separation and improve the properties of Al–Bi immiscible alloy by in situ phases. The in situ AlB2 phase acts as heterogeneous nucleation site to accelerate the nucleation and slow down the velocity of the Bi-rich droplet, resulting in a significant size reduction and a homogeneous microstructure of Al–Bi immiscible alloy. The self-lubricating wear resistance of Al–Bi immiscible alloy can be further enhanced by in situ Al2Cuphase.

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原位相对Al-Bi不混溶合金组织和性能的影响

Al-Bi 不混溶合金作为具有均匀分布的少数相的潜在自润滑耐磨材料特别令人感兴趣。然而，由于 Al-Bi 不混溶合金的液相分离，通过传统的铸造方法很难获得均匀的显微组织。我们开发了一种新的策略来抑制液相分离并通过原位相改善 Al-Bi 不混溶合金的性能。原位 AlB2 相作为异质成核位点，以加速成核并减慢富铋液滴的速度，从而显着减小 Al-Bi 不混溶合金的尺寸和均匀的微观结构。原位Al2Cu相可以进一步提高Al-Bi不混溶合金的自润滑耐磨性。