Electrodeposition of supersaturated aluminum-based solid solutions for maximizing strength and corrosion resistance

α-Al基体中存在较大的金属间颗粒（IMPs），使经变形或时效强化的铝（Al）具有强度与耐蚀性之间的矛盾。因此，提出了具有均匀微观结构的过饱和固溶体来克服这种冲突。在本研究的第一阶段，采用典型的1-乙基-3-甲基咪唑氯([EMIm]Cl)-氯化铝（AlCl3）离子液体（ILs）获得了Al（Fe）过饱和固溶体，并通过光谱和从头计算澄清了溶解Fe2+的配位。TEM和XRD分析表明，Fe (1.5 ~ 14.1 at。%)能完全溶解于α-Al基体中，其含量受溶液中氯化铁（FeCl2）浓度控制。特别是，根据纳米压痕和循环极化曲线，这些具有较高铁固溶度的Al（Fe）合金在硬度和抗点蚀性能方面都得到了提高。此外，我们新开发的季系磷基il （[p14,6,6,6]Cl-AlCl3）可以使Al(Si, 3-6 at。（%）室温下的过饱和固溶体，而其性能包括硬度和耐腐蚀性需要进一步研究。

Aluminum (Al) strengthened through alloying followed by the deformation and/or aging is inherently subject to the conflict between strength and corrosion resistance due to coarse intermetallic particles (IMPs) in α-Al matrix. Accordingly, supersaturated solid solutions with a homogenous microstructure are proposed to defeat that conflict.In the first stage of this research, the Al(Fe) supersaturated solid solutions have been obtained using typical 1-ethyl-3-methylimidazolium chloride ([EMIm]Cl)－aluminum chloride (AlCl3) ionic liquids (ILs), where the coordination of dissolving Fe2+ have been clarified by spectroscopies together with ab initio calculation. The TEM and XRD demonstrated that Fe (1.5－14.1 at.%) could completely dissolve into α-Al matrix, and its contents were controlled via iron(II) chloride (FeCl2) concentrations in baths. Especially, these Al(Fe) alloys with higher Fe solid solubility prove to attain a simultaneous improvement in hardness and pitting corrosion resistance based on nanoindentation and cyclic polarization curves respectively.In addition, our newly developed quaternary phosphonium-based ILs ([P14,6,6,6]Cl－AlCl3) could give Al(Si, 3－6 at.%) supersaturated solid solutions at room temperature, while their properties including hardness and corrosion resistance require further studies.