Hardness (H) is the main mechanical property which determines the wear resistance of materials. Young's modulus (E) has also been shown to influence the wear resistance. The H/E ratio is often used as an index to represent wear resistances of materials and coatings. The larger the H/E ratio, the higher the wear resistance. However, though this ratio is shown to be a measure of the wear resistance for reported cases, whether or not it can be generalized as an index of wear resistance is questionable. In this study, we investigate the wear behaviors of strain-hardened Cu and Mg, and demonstrate the H/E ratio markedly overestimates the wear resistance. Although the cold-work increases hardness, it deteriorates the material integrity with introduced lattice imperfections, which negatively influence the atomic bonding, thus decreasing the benefit of strain-hardening to the wear resistance.

硬度（H）是决定材料耐磨性的主要机械性能。杨氏模量 (E) 也已被证明会影响耐磨性。H/E 比率通常用作表示材料和涂层耐磨性的指标。H/E比越大，耐磨性越高。然而，尽管该比率被证明是报告案例的耐磨性的量度，但它是否可以概括为耐磨性的指标是值得怀疑的。在这项研究中，我们研究了应变硬化 Cu 和 Mg 的磨损行为，并证明 H/E 比明显高估了耐磨性。虽然冷加工增加了硬度，但它会因引入晶格缺陷而降低材料完整性，从而对原子键合产生负面影响，