Effect of Electron-Plasma Treatment on the Microstructure of Al-11wt%Si Alloy

Abstract The analysis of structure, defect substructure, elemental and phase compounds and friction properties of Al-11wt%Si alloy surface layer of subjected to complex treatment was carried out by methods of scanning and transmission electron microscopy. Complex treatment includes the electroexplosion influence by Al-Y2O3 compound and subsequent electron beam irradiation. The surface layer ≈ 80 μm thick is formed by high-velocity crystallization cells of 0.8-1.3 μm in dimension. Interlayers 50–75 nm thick located along the cells of high-velocity crystallization are enriched by atoms of silicon and yttrium. Complex surface treatment leads to the increase by 18 times in wear resistance and decrease by 1.6 times in the friction factor of the modified layer.

摘要 本研究采用扫描电子显微镜与透射电子显微镜方法，对经复合处理后的铝-11wt%硅（Al-11wt%Si）合金表层的微观组织、缺陷亚结构、元素与相组成以及摩擦性能开展了分析。该复合处理工艺包括采用Al-Y₂O₃化合物实施电爆炸处理，以及后续的电子束辐照工序。经处理后形成的表层厚度约为80μm，其微观组织由尺寸介于0.8~1.3μm的高速结晶胞晶构成。沿高速结晶胞晶分布的厚度为50~75nm的层间结构，富含硅与钇原子。经该复合表面处理后，改性层的耐磨性提升至原有的18倍，摩擦系数降低至初始值的1/1.6。