Abstract
The Nano-ZrO2 reinforced AZ31 alloy composites were fabricated by friction stir processing (FSP) with three multi-pass and high rotation speed. The AZ31/2.14 vol% ZrO2, AZ31/4.29 vol% ZrO2 and AZ31/6.43 vol% ZrO2 composites were designed. The fine microstructure and uniform dispersion of ZrO2 particles were observed in the AZ31/ZrO2 composites. The excellent interfacial bonding was observed between the Mg matrix and ZrO2. The hardness and tensile properties were enhanced after three cumulative FSP passes. This was attributed to grain refinement and strengthening effects of ZrO2. The tensile properties and hardness of the AZ31/ ZrO2 composite increased with the increase of volume fraction of the ZrO2 particles from 2.14 vol% to 6.43 vol%.
Highlights
Mg alloys have some advantages, such as low density, high specific strength, and high damping capacity, which have been applied in automotive and aerospace industries
The AZ31/2.14 vol% ZrO2, AZ31/4.29 vol% ZrO2, and AZ31/6.43 vol% ZrO2 composites have been successfully fabricated by friction stir processing (FSP) with one pass, two multi-passes, and three multi-passes and high rotation speed
The effects of FSP passes and ZrO2 particles on the mechanical properties were discussed; the main conclusions generated are as follows: (1) The fine microstructure was observed in the AZ31/ZrO2 composites after three multi-pass FSPs
Summary
Mg alloys have some advantages, such as low density, high specific strength, and high damping capacity, which have been applied in automotive and aerospace industries The Mg alloys and Mg-based composites with excellent mechanical properties have been developed to meet the large demand for light materials in automotive and aerospace industries (Zhang M. et al, 2017; Yu et al, 2018; Shahin et al, 2020). Fabricated by in situ synthesis process, semi-powder metallurgy, and friction stir processing (FSP) (Li et al, 2017; Meng et al, 2018; Zhang et al, 2018). Among these techniques for fabrication of Mg-based composites, FSP has attracted extensive attention, which could fabricate Mg-based composites efficiently due to frictional heating and severe plastic deformation (Del Valle et al, 2015; Liang et al, 2017). The distribution of reinforcement and the interfacial bonding between matrix and reinforcement largely determines its mechanical properties
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