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Deformation mechanisms of AZ31 alloy at cryogenic temperature investigated by in-situ neutron diffraction

その場中性子回折によるAZ31合金の極低温変形メカニズムの考察

Gong, W.   ; Harjo, S.   ; 眞山 剛*; 川崎 卓郎  ; 相澤 一也  ; Sun, B.*; 辻 伸泰*

Gong, W.; Harjo, S.; Mayama, Tsuyoshi*; Kawasaki, Takuro; Aizawa, Kazuya; Sun, B.*; Tsuji, Nobuhiro*

その場中性子回折による極低温圧縮変形中のAZ31マグネシウム合金の変形挙動と変形メカニズムを調べた。21Kでの応力-ひずみ曲線は、室温よりわずかに高い降伏応力を示したが、破断応力と破断ひずみが大幅に高くなったこと分かった。極低温でのc軸引張双晶の促進とc軸圧縮双晶の抑制が、AZ31合金の引張強さ・破断伸びともに向上させる理由であることが明らかにした。

In situ neutron diffraction experiments at cryogenic temperature was performed to investigate the temperature dependence of deformation behavior and corresponding activities of deformation mechanisms in a commercial AZ31 Mg alloy. The stress-strain curve at 21K showed slightly higher macroscopic yield stress but remarkably higher fracture stress and strain than that of room temperature. The enhancement of extension twinning and suppression of contraction twinning at cryogenic temperature are considered to be the reasons for improving the corresponding macroscopic strength and ductility in the commercial AZ31 alloy.

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