Friction stir processing of thixoformed AZ91D magnesium alloy and fabrication of surface composite reinforced by SiCps

Tijun Chen; Zhanming Zhu; Ying Ma; Yuandong Li; Yuan Hao

doi:10.1007/s11595-010-2223-0

Journal of Wuhan University of Technology Materials Science Edition ›› 2010, Vol. 25 ›› Issue (2) : 223 -227. DOI: 10.1007/s11595-010-2223-0

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Friction stir processing of thixoformed AZ91D magnesium alloy and fabrication of surface composite reinforced by SiC_ps

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Abstract

The microstructural evolution characteristics of the thermomechanically affected zone (TMAZ) alloy during friction stir processing (FSP) of thixoformed (TF) AZ91D alloy were investigated. Simultaneously, a surface composite layer reinforced by SiC particles (SiC_ps) was prepared on the alloy by FSP and the corresponding tribological properties were examined. The experimental results indicate that dynamic recrystallization and mechanical separation (including splitting and fracture of the primary grains) are the main mechanisms of grain refinement for the TMAZ. A composite surface reinforced by uniformly distributed SiC_ps was prepared on the alloy. Compared with the corresponding permanent mould casting alloy and the TF alloy without composite surface, the TF alloy with composite surface has the highest wear resistance and lowest friction coefficient.

Keywords

friction stir processing / thixoforming / AZ91D alloy / microstructure evolution / composite surface / tribological properties

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Tijun Chen, Zhanming Zhu, Ying Ma, Yuandong Li, Yuan Hao. Friction stir processing of thixoformed AZ91D magnesium alloy and fabrication of surface composite reinforced by SiC_ps. Journal of Wuhan University of Technology Materials Science Edition, 2010, 25(2): 223-227 DOI:10.1007/s11595-010-2223-0

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