TY - JOUR
T1 - Localized dislocation interactions within slip bands and crack initiation in Mg-10Gd-3Y-0.3Zr alloy
AU - He, Chao
AU - Li, Xue
AU - Liu, Yongjie
AU - Wang, Chong
AU - Zhang, Hong
AU - Li, Lang
AU - Wang, Qingyuan
AU - Shao, Xiaohong
AU - Chen, Qiang
N1 - Funding Information:
This work was financially supported by the National Natural Science Foundation of China (Nos. 12072212 and 11832007), National Key Research and Development Program of China (No. 2018YFE0307104), and Sichuan University & ZiGong government Support Program (No. 2019-CDZG-4). Special thanks for the microstructural characterization at the ultramicroscopy research center of Kyushu University in Japan.
Funding Information:
This work was financially supported by the National Natural Science Foundation of China (Nos. 12072212 and 11832007 ), National Key Research and Development Program of China (No. 2018YFE0307104 ), and Sichuan University & ZiGong government Support Program (No. 2019-CDZG-4). Special thanks for the microstructural characterization at the ultramicroscopy research center of Kyushu University in Japan.
Publisher Copyright:
© 2021
PY - 2021/9
Y1 - 2021/9
N2 - The underlying low-stress cyclic deformation and associated dislocation activities within the slip bands (SBs) in a rare earth-containing magnesium (RE-Mg) alloy were characterized. The results show that basal slip is the predominant deformation at grain scale, but the gliding of 〈c + a〉 dislocation is also visible near grain boundaries to accommodate localized inhomogeneous deformation. The interaction between basal 〈a〉 dislocations and non-basal 〈c + a〉 dislocations results in the nucleation of dislocation intensity zones (DIZs), which subsequently hinders the development of the basal slip bands. Therefore, it is suggested that the DIZs contributed to the enhanced high cycle fatigue resistance of RE-Mg alloys.
AB - The underlying low-stress cyclic deformation and associated dislocation activities within the slip bands (SBs) in a rare earth-containing magnesium (RE-Mg) alloy were characterized. The results show that basal slip is the predominant deformation at grain scale, but the gliding of 〈c + a〉 dislocation is also visible near grain boundaries to accommodate localized inhomogeneous deformation. The interaction between basal 〈a〉 dislocations and non-basal 〈c + a〉 dislocations results in the nucleation of dislocation intensity zones (DIZs), which subsequently hinders the development of the basal slip bands. Therefore, it is suggested that the DIZs contributed to the enhanced high cycle fatigue resistance of RE-Mg alloys.
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U2 - 10.1016/j.ijfatigue.2021.106302
DO - 10.1016/j.ijfatigue.2021.106302
M3 - Article
AN - SCOPUS:85106641117
SN - 0142-1123
VL - 150
JO - International Journal of Fatigue
JF - International Journal of Fatigue
M1 - 106302
ER -