In situ neutron diffraction study of compression behavior in LPSO-type Mg alloys

その場中性子回折によるLPSO型Mg合金の圧縮変形挙動の検討

Gong, W.; 相澤 一也  ; Harjo, S.   ; 阿部 淳*; 岩橋 孝明; 神山 崇*

Gong, W.; Aizawa, Kazuya; Harjo, S.; Abe, Jun*; Iwahashi, Takaaki; Kamiyama, Takashi*

Recently, a new series of magnesium alloys with the microstructure consist of long-period stacking ordered (LPSO) structure and HCP-Mg phase have been attracted considerable attention due to the excellent mechanical properties. In the present work, LPSO-type alloys were studied by in situ neutron diffraction during compression by using the engineering neutron diffractometer, TAKUMI at J-PARC. A LPSO single phase alloy MgZnY (at%) and a LPSO and HCP-Mg dual phases alloy MgZnY were investigated to estimate grain-orientation-dependent stress and phase stress under uniaxial compression. The remarkable plastic anisotropy was found in the LPSO phase. Along compression direction, the a-axis grain families started to yield via kink deformation. In the LPSO and HCP-Mg dual phases alloy. The basal slip of HCP-Mg was generated at a low applied stress before the yielding of LPSO phase. The LPSO phase acts as the strengthening phase during compression deformation in the alloy.