【摘要】 对钪在Al-Si活塞合金中的应用进行了研究,通过添加微量的钪,合金中的共晶Si分布更弥散,基体α-Al变细,初晶Si尺寸有所减小,合金室温拉伸强度得到提高。此外,分析发现一部分钪存在于合金中的AlNiCu热强相中,增强了该化合相的热强化作用,从而明显提高了合金的高温强度。更多还原

【Abstract】 The study on scandium’s role in Al-Si piston alloy was performed. It has been found that the distribution of eutectic Si becomes more evenly and that the α-Al matrix becomes refined after addition of trace Sc. The size of primary Si was also reduced. All of these result in that the ambient temperature tensile strength of the alloy is increased. It is also found that some scandium lies in a kind of AlNiCu intermetallic compound and thus reinforces the phase, which can help to increase the elevated temperature tensile strength of the alloy.更多还原