Abstract

In the present study, effects of Mn content on microstructure, hardness, tensile and dry sliding wear properties of eutectic Al–Si–Cu alloy in as cast-state were investigated. Mn addition to the eutectic alloy results in the formation of α-Al₁₅Mn₃Si₂ phase in its microstructure. It was found that hardness of eutectic alloy increases continuously with increasing Mn content while its tensile strength and percentage elongation values decrease. It was also found that the friction coefficient and volume loss of eutectic alloy decrease as Mn content increases. Amongst the alloys, the lowest friction coefficient is obtained with Al–12Si–3Cu–2Mn alloy yet the Al–12Si–3Cu–1Mn alloy exhibits the highest wear resistance. Formation of adhesion layer, its oxidation and delamination were observed to be main wear mechanisms of Al–12Si–3Cu–(0–2)Mn alloys. These findings are explained in terms of formation of α-Al₁₅Mn₃Si₂ phase, and its cracking tendency effect.

Graphic abstract

中文翻译：

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锰含量对共晶Al-Si-Cu合金组织，机械和干滑动磨损性能的影响

抽象的

在本研究中，研究了锰含量对铸造态共晶Al-Si-Cu合金的组织，硬度，拉伸强度和干滑动磨损性能的影响。锰除了共晶合金导致的α-Al的形成₁₅的Mn ₃的Si ₂相的微观结构。发现共晶合金的硬度随着Mn含量的增加而连续增加，而其抗拉强度和延伸率百分比降低。还发现，随着Mn含量的增加，共晶合金的摩擦系数和体积损失减小。在这些合金中，Al-12Si-3Cu-3Mn合金的摩擦系数最低，而Al-12Si-3Cu-1Mn合金则具有最高的耐磨性。观察到粘附层的形成，其氧化和分层是Al-12Si-3Cu-（0-2）Mn合金的主要磨损机理。这些发现在形成的α-Al的来解释₁₅的Mn ₃的Si ₂相，其开裂倾向的效果。

图形摘要