In Situ Study of Role of Microstructure on Antiwear Tribofilm Formation on AZ91 Magnesium Alloy under Zinc Dialkyldithiophosphate Containing Lubricant,Advanced Engineering Materials

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In Situ Study of Role of Microstructure on Antiwear Tribofilm Formation on AZ91 Magnesium Alloy under Zinc Dialkyldithiophosphate Containing Lubricant
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-06-03 , DOI: 10.1002/adem.202000335
Deepak Kumar ₁ , Jayant Jain ₁ , Nitya Nand Gosvami ₁

Affiliation

Herein, role of microstructure on friction and wear properties of as‐cast and aged AZ91 alloy is investigated using atomic force microscopy (AFM) in lubricated conditions. The lubricant contains commercial antiwear additive zinc dialkyldithiophosphate (ZDDP), which reduces wear via sliding‐induced antiwear tribofilm. The tribofilm growth is found to be highly sensitive to the local microstructure of the alloy. For the case of as‐cast AZ91 alloy, the tribofilm readily forms on large Mg₁₇Al₁₂ precipitates, whereas α‐Mg matrix shows wear and absence of any tribofilm growth. Interestingly, for the aged alloy, the tribofilm formation on continuous precipitate (CP) and discontinuous precipitate (DP) regions is not observed. The stable sliding contact offered by large precipitates in the as‐cast microstructure is found to be critical for the tribofilm formation. Moreover, the results show a considerable difference in coefficient of friction (COF) for Mg₁₇Al₁₂ in the as‐cast microstructure as compared with that in the aged alloy.

中文翻译：

含润滑剂二烷基二硫代磷酸锌的微结构对AZ91镁合金抗磨摩擦膜形成的原位研究

本文中，在润滑条件下使用原子力显微镜（AFM）研究了显微组织对铸态和时效AZ91合金的摩擦磨损性能的作用。该润滑剂包含商业抗磨添加剂二烷基二硫代磷酸锌（ZDDP），可通过滑动诱导的抗磨摩擦膜减少磨损。发现摩擦膜的生长对合金的局部微观结构高度敏感。对于铸态AZ91合金，很容易在较大的Mg ₁₇ Al ₁₂上形成摩擦膜。沉淀，而α-Mg基质显示磨损且无摩擦膜生长。有趣的是，对于时效合金，未观察到在连续沉淀物（CP）和不连续沉淀物（DP）区域上形成摩擦膜。铸态微观结构中大量沉淀物提供的稳定滑动接触被发现对于摩擦膜的形成至关重要。此外，结果表明，与时效合金相比，Mg ₁₇ Al ₁₂在铸态组织中的摩擦系数（COF）有很大差异。

更新日期：2020-06-03

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