We study a quasicrystalline cast alloy and a film coating obtained by the improved method of threeelectrode ion-plasma sputtering of assembled targets with the following nominal composition: Al60Cu28Fe12 . The structure of the specimens was studied by the methods of quantitative metallography, X-ray diffraction analysis, X-ray energy-dispersive spectrometry, and transmission and scanning electron microscopies. The thermal stability of sputtered films was estimated with regard for the results of measurements of the electric resistance within the temperature range 293–1000°K. The corrosion properties in a 5% aqueous solution of NaCl (pH 6.9–7.1) were determined by the potentiodynamic method. It was discovered that a quasicrystalline icosahedral i -phase in the structure of Al–Cu–Fe cast alloy coexists with λ -Al13Fe4 , β -AlFe(Cu), τ -AlCu(Fe), η-AlCu, and θ-Al2Cu crystalline phases and occupies ∼ 56% of the volume. The Al–Cu–Fe film coating contains a dispersed quasicrystalline i -phase ∼ 3 nm in size, which is stable up to a temperature of 723°K. The polarization experiments reveal a higher corrosion resistance of the Al–Cu–Fe film coating in salt solutions of sodium chloride as compared with the corrosion resistance of cast alloy. The corrosion process has the character of pitting and runs according to the electrochemical mechanism with oxygen depolarization.

中文翻译：

---

准晶铸造合金和 Al-Cu-Fe 薄膜涂层的结构和腐蚀

我们研究了一种准晶铸造合金和通过三电极离子等离子体溅射的改进方法获得的具有以下标称成分的组装靶材的薄膜涂层：Al60Cu28Fe12。采用定量金相、X射线衍射分析、X射线能谱、透射和扫描电子显微镜等方法对试样的结构进行了研究。溅射薄膜的热稳定性是根据 293-1000°K 温度范围内电阻的测量结果来估计的。在 5% NaCl 水溶液（pH 6.9-7.1）中的腐蚀性能由动电位法测定。发现Al-Cu-Fe铸造合金结构中的准晶二十面体i相与λ-Al13Fe4、β-AlFe(Cu)、τ-AlCu(Fe)共存，η-AlCu 和 θ-Al2Cu 晶相占体积的 56%。Al-Cu-Fe 薄膜涂层含有分散的准晶 i 相，尺寸约为 3 nm，在 723°K 的温度下仍保持稳定。极化实验表明，与铸造合金的耐腐蚀性相比，Al-Cu-Fe 薄膜涂层在氯化钠盐溶液中具有更高的耐腐蚀性。腐蚀过程具有点蚀特征，按照氧去极化的电化学机制进行。极化实验表明，与铸造合金的耐腐蚀性相比，Al-Cu-Fe 薄膜涂层在氯化钠盐溶液中具有更高的耐腐蚀性。腐蚀过程具有点蚀特征，按照氧去极化的电化学机制进行。极化实验表明，与铸造合金的耐腐蚀性相比，Al-Cu-Fe 薄膜涂层在氯化钠盐溶液中具有更高的耐腐蚀性。腐蚀过程具有点蚀特征，按照氧去极化的电化学机制进行。