Compressive deformation behavior of AZ31 alloy at 21K; An
neutron diffraction study
21KにおけるAZ31合金の圧縮変形挙動; その場中性子回折による研究
Gong, W.
; 川崎 卓郎
; Zheng, R.*; 眞山 剛*; Sun, B.*; 相澤 一也
; Harjo, S.
; 辻 伸泰*
Gong, W.; Kawasaki, Takuro; Zheng, R.*; Mayama, Tsuyoshi*; Sun, B.*; Aizawa, Kazuya; Harjo, S.; Tsuji, Nobuhiro*
Deformation behavior during uniaxial compression at 21 K and 298 K in a commercial AZ31 magnesium alloy was studied by
neutron diffraction. Decreasing the deformation temperature resulted in a slight increase in yield stress (115 MPa
139 MPa), but a remarkable enhancement in both the fracture stress (365 MPa
551 MPa) and fracture strain (12.8%
16.5%). The low temperature sensitivity of the {10
2} extension twinning which governed the macroscopic yielding led to the slight increase in yield stress. At 21K, basal slip was suppressed, while the extension twinning was promoted resulted in higher twin volume fraction. In the late stage of deformation, the {10
1}-{10
2} double twinning was suppressed, which is considered to be the reason to delay the fracture at 21 K.