Abstract The poor wear resistance has been a main challenge for extensive application of Mg alloy. The method of coupling porous flexible Mg alloy-substrate and hard Al alloy-coating was studied in this paper to improve the wear resistance. Nano-indentation and scratch tests were performed on pure Mg, coating deposited on porous substrate for 2 h (Po-Mg-Al-2 h), coating deposited on substrate for 2 h (Mg-Al-2 h) and 4 h (Mg-Al-4 h) to make a direct comparison. Po-Mg-Al-2 h exhibited the highest hardness and elastic modulus, followed by Mg-Al-2 h, Mg-Al-4 h and Mg. Corresponding Coefficients of Friction (COFs) from scratch tests of aforementioned specimens were 0.224, 0.232, 0.234 and 0.308, respectively. Additionally, the scratched morphologies of Po-Mg-Al-2 h showed a relatively smooth groove and short residual scratch without debris and flakes observed in other specimens. A better capability of wear resistance, significantly enhanced hardness and modulus were obtained through coupling porous substrate and Al coating.

中文翻译：

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通过耦合多孔基体和铝涂层提高镁合金的表面性能

摘要 耐磨性差一直是镁合金广泛应用的主要挑战。本文研究了多孔柔性镁合金基体与硬质铝合金涂层的偶联方法，以提高耐磨性。在纯镁上进行纳米压痕和划痕测试，涂层在多孔基材上沉积 2 小时（Po-Mg-Al-2 h），涂层在基材上沉积 2 小时（Mg-Al-2 h）和 4 小时（ Mg-Al-4 h) 进行直接比较。Po-Mg-Al-2 h 表现出最高的硬度和弹性模量，其次是 Mg-Al-2 h、Mg-Al-4 h 和 Mg。来自上述样品的划痕测试的相应摩擦系数 (COF) 分别为 0.224、0.232、0.234 和 0.308。此外，Po-Mg-Al-2 h 的划痕形貌显示出相对光滑的凹槽和较短的残留划痕，没有在其他样品中观察到碎片和薄片。通过将多孔基体与铝涂层结合，获得了更好的耐磨性、显着提高的硬度和模量。