应变对大变形铜磨损率的影响
Strain effects on the wear rate of severely deformed copper
摘要：
已经开发了多种剧烈塑性形变（SPD）技术以将材料加工到高应变并赋予微观结构细化。高压扭转（HPT）是一种将不均匀应变施加到加工盘的技术，其中在中心处具有低应变并且在外边缘处具有高应变。在文献中，当表征HPT后的磨损性能时，这种不均匀性通常被忽略。在这项工作中，通过在盘上的几个明智的位置进行干滑动往复磨损试验，HPT加工的纯铜盘的磨损率进行了表征。仅从两个圆盘中，就可以获得许多应变范围内的耐磨性。这些测量与文献中的其他SPD过程在不同的应变。磨损率下降，并在约25%的未处理状态下，当处理过去的等效应变约15，之后，显微组织和显微硬度饱和也已观察到。还观察到施加的SPD剪切的方向和滑动磨损方向之间的关系的一些迹象。增量显微组织，显微硬度，和耐磨性演变过去的等效应变约15表明，对于高纯度铜，这些属性没有收到明显的好处，从更高的SPD应变。
英文摘要：
A variety of severe plastic deformation (SPD) techniques have been developed to process materials to high strains and impart microstructural refinement. High pressure torsion (HPT) is one technique that imparts inhomogeneous strain to process discs with low strain in the center and high strain at the outer edge. In the literature, this inhomogeneity is typically ignored when characterizing wear properties after HPT. In this work, the wear rate of pure copper discs processed by HPT was characterized by conducting dry sliding reciprocating wear tests at a few judicious locations on the discs. From only two discs, the wear resistance across many ranges of strains was captured. These measurements agreed with the literature for other SPD processes at varying strains. Wear rates dropped and plateaued at about 25% that of the unprocessed state when processing past equivalent strains of around 15, after which microstructural and microhardness saturation has also been observed. Some indication of a relationship between the direction of the imposed SPD shearing and the sliding wear direction was also observed. The incremental microstructure, microhardness, and wear resistance evolution past equivalent strains of ~15 indicate that for high purity copper these properties receive no clear benefit from higher SPD strains.
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