Abstract

Aluminum matrix composites are widely used in many structural application due to properties like high specific strength, wear resistance, lightweight and fatigue properties. The aim of the current work is to investigate the effect of the addition of nanosize $\mathrm{Ti}{\mathrm{O}}_2$ participles to AA6063-T₄ aluminum alloy on the electrical conductivity, magnetic and fatigue properties of composites produced by stir casting method. It was revealed that the AA6063-T₄/$\mathrm{Ti}{\mathrm{O}}_2$ composites were successfully prepared with 3 wt%, 5 wt% and 7 wt% TiO₂ using a stir casting technique with electrical conductivity increasing with increasing amount of $\mathrm{Ti}{\mathrm{O}}_2.$ Also it was found that the electrical conductivity of all composites was higher than the base metal matrix and the conductivity was proportion to the frequency for both matrix and composites. The magnetic studies revealed an improvement of the nanocomposites in comparison with the base metal. The fatigue life and fatigue strength of 7 wt% TiO₂ composite was found to be higher than that of other composites and base matrix.

摘要

铝基复合材料由于诸如高比强度，耐磨性，轻质和疲劳性能等特性而被广泛用于许多结构应用中。当前工作的目的是研究添加纳米尺寸的影响$\mathrm{钛}{\mathrm{Ø}}_2$AA6063-T ₄铝合金是通过搅拌铸造法制备的复合材料的电导率，磁性能和疲劳性能的代表。据透露，AA6063-T ₄ /$\mathrm{钛}{\mathrm{Ø}}_2$使用搅拌铸造技术成功地制备了3 wt％，5 wt％和7 wt％TiO _2的复合材料，其电导率随添加量的增加而增加。$\mathrm{钛}{\mathrm{Ø}}_2。$还发现，所有复合材料的电导率均高于贱金属基体，并且电导率与基体和复合体的频率均成比例。磁性研究表明，与贱金属相比，纳米复合材料得到了改善。发现7wt％的TiO ₂复合材料的疲劳寿命和疲劳强度高于其他复合材料和基础基质的疲劳寿命和疲劳强度。