その場中性子回折によるZ6マグネシウム合金の析出強化の考察

In-situ neutron diffraction study of precipitation hardening in Z6 Mg alloy

Gong, W.   ; Zheng, R.*; Harjo, S.   ; 川崎 卓郎   ; 辻 伸泰*

Gong, W.; Zheng, R.*; Harjo, S.; Kawasaki, Takuro; Tsuji, Nobuhiro*

Precipitation hardening in magnesium (Mg) alloys is generally due to the interactions between the precipitates and deformation modes. The precipitates formed in Mg alloys with rod-shaped or plate-shaped always keep a specific crystallographic orientation relationship with the HCP matrix. As a result, the rod-shaped or plated-shaped precipitates exhibit different interactions with the deformation modes depending on the geometric relationships between the precipitates and dislocation glide or twinning shear directions in the surrounding HCP lattices. Even many efforts have been devoted to clarify this phenomenon, the quantitative contributions of precipitation hardening on various deformation modes are still not fully understood. In-situ neutron diffraction can provide the bulk averaged crystallographic information such as lattice strains, dislocation density and texture for interpretating macroscopic deformation behavior. The Elastic-Plastic Self-Consistent (EPSC) polycrystal model is suitable to account for the deformation behavior in Mg alloys. In present study, the combination of in-situ neutron diffraction and EPSC modeling was employed to investigate the precipitation hardening behavior in a Z6 Mg alloy.