Hardness and corrosion behavior of an Al-2Mn alloy with both microstructural and chemical gradients
Hardness and corrosion behavior of an Al-2Mn alloy with both microstructural and chemical gradients
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具有微观结构和化学梯度的 Al-2Mn 合金的硬度和腐蚀行为
DOI：
10.1038/s41529-022-00274-w
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发表时间：
2022-08-02
影响因子：
5.1
通讯作者：
Wang，Shuai
中科院分区：
文献类型：
--
作者：
Sun，Qingqing;He，Jing;Wang，Shuai
通过结合表面机械处理和后时效处理，制备了一种在其表面附近具有梯度微观结构和化学性质的Al-2Mn二元合金。 TEM结果表明最表面层的最小晶粒尺寸低于100nm。 SIMS结果显示，Mn在厚度~2μm的表层中被耗尽，这是由于沿晶界和位错管的“短路”扩散所致。显微硬度和腐蚀测试结果表明，采用这种梯度设计，硬度和耐腐蚀性能均显着提高。 XPS 和 Mott-Schottky 结果表明，梯度 Al-Mn 合金的氧化膜比粗晶样品的氧化膜更薄、更致密。我们的设计方法获得金属表面附近的微观结构和化学成分的梯度分布，为克服 3000 系列铝合金的强度和腐蚀等性能之间的权衡提供了一条途径。
An Al–2Mn binary alloy with gradient microstructure and chemistry near its surface was fabricated by combining surface mechanical treatment and post-ageing treatment. TEM results indicate that the minimum grain size of the topmost surface layer is below 100 nm. As revealed by SIMS results, Mn is depleted in the surface layer with ~2 μm in thickness, which is due to the “short-circuit” diffusion along grain boundaries and dislocation pipes. Microhardness and corrosion testing results revealed that both hardness and corrosion resistance increase substantially with this gradient design. XPS and Mott–Schottky results demonstrate that the oxide film of the gradient Al–Mn alloy is thinner and denser than that of the coarse-grained sample. Our design method of obtaining gradient distribution both in microstructure and chemistry near metal surface lights a pathway for overcoming the trade-off between properties such as strength and corrosion in 3000 series Al alloys.