J. Mater. Sci. Technol. ›› 2025, Vol. 229: 159-172.DOI: 10.1016/j.jmst.2024.12.045

• Research article • Previous Articles     Next Articles

Hot deformation and hot processing behavior of deformable Tip reinforced Mg-5Zn-0.5Ca composite

Yu Zhang, Kun-kun Deng*, Cui-ju Wang, Kai-bo Nie, Quan-xin Shi, Yi-jia Li   

  1. Shanxi Key Laboratory of advanced magnesium-based materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
  • Received:2024-10-25 Revised:2024-12-22 Accepted:2024-12-22 Published:2025-09-10 Online:2025-02-18
  • Contact: *E-mail address: dengkunkun@tyut.edu.cn (K.-k. Deng).

Abstract: The spherical Ti particle (Tip) reinforced Mg-5Zn-0.5Ca (Tip /ZX50) composite was prepared via the semi-solid stirring casting process and the effects of Tip on the hot deformation and hot processing behavior of matrix alloy were investigated through uniaxial hot compression testing. The results indicate that a parti-cle deformation zone (PDZ) forms around the Tip with the deformation of the Tip /ZX50 composite, which is propitious to the dynamic recrystallization (DRX) of the matrix alloy. The range of the PDZ and the promoting effect of the Tip on DRXed nucleation are inversely related to the deformation degree of the Tip. Moreover, the deformation of Tip alleviates the high stress in the matrix alloy during deformation, ex-panding the processing range and reducing the average deformation activation energy of the matrix alloy. Notably, the minimum processing temperature (493 K) of the Tip /ZX50 composite is significantly lower than that of hardened particle reinforced magnesium matrix composites. The hot deformation mechanism of the Tip /ZX50 composite is dislocation climb controlled by both lattice diffusion and pipe diffusion.

Key words: Deformable Tip, Particle deformation zone, Dynamic recrystallization, Hot deformation mechanism, Processing map