Effect of extrusion ratio in hot-extrusion on kink deformation during compressive deformation in an Mg/LPSO dual-phase magnesium alloy monitored by neutron diffraction

その場中性子回折でモニタリングしたMg/LPSO二相マグネシウム合金の圧縮変形時のキンク変形に及ぼす熱間押出成形の押出比の影響

Harjo, S.   ; Gong, W.   ; 相澤 一也  ; 川崎 卓郎   ; 山崎 倫昭*; 眞山 剛*; 河村 能人*

Harjo, S.; Gong, W.; Aizawa, Kazuya; Kawasaki, Takuro; Yamasaki, Michiaki*; Mayama, Tsuyoshi*; Kawamura, Yoshihito*

To elucidate the effect of extrusion ratio in hot-extrusion on the deformation behavior during compression of MgZnY alloy containing about 25-vol% long-period stacking ordered phase (LPSO) in the HCP structured matrix (Mg), neutron diffraction measurements were performed under compressive loading using four types of samples: as-cast and after hot extrusion at 623 K with extrusion ratios of 5.0, 7.5 and 12.5. The macroscopic yielding was observed to appear by the occurrence of basal slip of Mg in the as-cast sample and at the onset of twinning in the hot extruded samples. The applied stress to initiate slip, twinning, and kinking increased by hot extrusion and then decreased with increasing extrusion ratio. LPSO shared higher stress than Mg and the ratio to the strength increased as the extrusion ratio increased.