In the present paper, effect of contact pressure and low sliding speed on dry sliding oxidative wear resistance of experimental alloy LM 29 (Al-17Si-1.2Cu-0.8Ni-0.6Mg) has been investigated. Experimental alloy produced by foundry technique was modified - refined by using red phosphorus and Al-5Ti-1B master alloy. Refined-modified alloy was given T_6 age hardening heat treatment. PIN-ON-DISC type friction and wear testing machine (DUCOM, INDIA) was used for wear behaviour study of as-cast, modified-refined, and heat-treated alloy. Dry sliding wear test was performed at different contact pressures (0.35, 0.7 & 1.05 MPa) and sliding speeds (0.2, 0.5 & 0.9 m/s). it was found that contact pressure has non-linear relationship with wear rate and which also is affected by sliding speed. At low sliding speed i.e. 0.2 m/s, wear rate increase linearly with the contact pressure. No major increase in wear rate was noted with increase of contact pressure at comparatively high sliding speed say 0.5 or 0.9 m/s. friction force was found to decrease with increase in sliding speed. Bulk temperature rise due to frictional heating was found higher for as-cast alloy than the refined-modified or age hardened alloy under similar sliding conditions.
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机译：本文研究了接触压力和低滑动速度对实验合金LM 29（Al-17Si-1.2Cu-0.8Ni-0.6Mg）的干滑动氧化耐磨性的影响。通过铸造技术生产的实验合金经过改性-使用红磷和Al-5Ti-1B中间合金进行精制。对精制改性合金进行T_6时效硬化热处理。 PIN-ON-DISC型摩擦磨损试验机（DUCOM，印度）用于铸造，改性精炼和热处理合金的磨损性能研究。在不同的接触压力（0.35、0.7和1.05 MPa）和滑动速度（0.2、0.5和0.9 m / s）下进行干式滑动磨损测试。结果发现，接触压力与磨损率具有非线性关系，并且还受滑动速度的影响。在低滑动速度（即0.2 m / s）下，磨损率随接触压力线性增加。在相对较高的滑动速度（例如0.5或0.9 m / s）下，随着接触压力的增加，磨损率没有明显增加。发现摩擦力随着滑动速度的增加而减小。发现在相似的滑动条件下，铸态合金由于摩擦加热而引起的体温升高高于精炼改性或时效硬化合金。
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