Corrosion Behavior and Hardness of Al–M (M: Mo, Si, Ti, Cr) Alloys
Corrosion Behavior and Hardness of Al–M (M: Mo, Si, Ti, Cr) Alloys
复制标题
Al-M（M：Mo、Si、Ti、Cr）合金的腐蚀行为和硬度
作者：
J. Esquivel;R. Gupta
采用动电位极化和表面分析方法，研究了铸造Al-5at.%Cr、Al-5at.%Si、Al-5at.%Mo和Al-5at.%TiAl-5合金和高能球磨后冷压固结Al-5 at.%At.%TiAl-5合金的腐蚀行为。用扫描电子显微镜、能量色散X射线能谱和X射线衍射分析对合金进行了表征。还测量了代表强度的硬度。铸态合金含有粗大的金属间化合物，耐蚀性较差。高能球磨Al-5%Al-Cr合金的耐蚀性和硬度显著提高，这主要归因于其细化到纳米级的晶粒和扩大了铬在Al中的固溶度。研究表明，高能球磨能够生产出耐蚀性和硬度均得到改善的铝合金。
The corrosion behavior of Al–5 at.% Cr, Al–5 at.% Si, Al–5 at.% Mo and Al–5 at.% Ti produced via casting and Al–5 at.% Cr produced by high-energy ball milling and subsequent consolidation by cold pressing was studied using potentiodynamic polarization and surface analysis following constant immersion tests. Alloys were characterized using a scanning electron microscope coupled with the energy-dispersive X-ray spectroscopy and X-ray diffraction analysis. Hardness, a representative of the strength, was also measured. The alloys produced by casting contained coarse intermetallics and therefore exhibited poor corrosion resistance. Al–5 at.% Cr alloy produced by high-energy ball milling exhibited a significantly improved corrosion resistance and hardness, which was attributed to the grain refinement to nanoscale and extended solid solubility of Cr in Al. The study indicated that the high-energy ball milling was capable of producing Al alloys with improved corrosion behavior and hardness.