揭示铁磁材料中摩擦磁化的起源,ACS Applied Materials & Interfaces

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揭示铁磁材料中摩擦磁化的起源
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-10-26 , DOI: 10.1021/acsami.0c15044
F. Gao _{1,

2} , J. Fan ₁ , L. Zhang ₁ , B. Chen ₂

Affiliation

摩擦磁化是数十年来已知的自然现象，如今已在许多工程应用中使用。但是，其内在来源仍然存在争议，并且尚未开发出基于机械的模型来预测摩擦磁化行为。在这项工作中，通过实验和建模方法研究了摩擦磁化的起源。首次将表面塑性变形扩展到次表层（即位错应变梯度），并结合了界面的摩擦学特性。通过在块对块接触配置中进行往复滑动实验，跟踪了在不同磨损方式下的摩擦磁化演变，测量了在地下产生的几何上必要的位错（GND），揭示了特征磁畴的形成。在具有接地应力的滑动诱发塑性变形机制的基础上，提出了摩擦磁化模型，将摩擦学模型与经典摩擦学和铁磁学联系起来。该模型表明，表面塑性应变和磨损痕迹的宽度是确定表面磁场变化的两个关键因素。我们认为，摩擦磁化作用是由磁变形引起的，伴随着地下GND的发展。我们的假设得到模型预测和实验观察之间良好一致性的支持。将经典摩擦学和铁磁学联系起来。该模型表明，表面塑性应变和磨损痕迹的宽度是确定表面磁场变化的两个关键因素。我们认为，摩擦磁化作用是由磁变形引起的，伴随着地下GND的发展。我们的假设得到模型预测和实验观察之间良好一致性的支持。将经典摩擦学和铁磁学联系起来。该模型表明，表面塑性应变和磨损痕迹的宽度是确定表面磁场变化的两个关键因素。我们认为，摩擦磁化作用是由磁变形引起的，伴随着地下GND的发展。我们的假设得到模型预测和实验观察之间良好一致性的支持。

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Unraveling the Origin of Tribomagnetization in Ferromagnetic Materials

Tribomagnetization, a natural phenomenon known for decades, has many engineering applications today. However, its intrinsic origin remains controversial and the mechanistic-based model has not yet been developed to predict the tribomagnetization behavior. In this work, the origin of tribomagnetization is investigated via both the experimental and modeling approaches. For the first time, the expansion of surface plastic deformation to the subsurface layer (i.e., dislocation strain gradient) is characterized in conjunction with the tribological behavior of the interface. By performing the reciprocating sliding experiment in a pin-on-block contact configuration, the tribomagnetization evolution in different wear regimes is followed, the geometrically necessary dislocations (GNDs) developed in the subsurface are measured, and the formation of characteristic magnetic domains is revealed. A tribomagnetization model is proposed on the basis of the sliding-induced plastic deformation mechanism with GNDs, bringing the missing link with classical tribology and ferromagnetism. The model reveals that the surface plastic strain and width of a wear scar are two crucial factors in determining the surface magnetic field changes. We believe that the tribomagnetization originates from the magnetic distortion accompanied by the progression of GNDs in the subsurface. Our hypothesis is supported by the good agreement between the model prediction and experimental observation.

更新日期：2020-11-04

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