TY - JOUR
T1 - Effect of microstructure on small fatigue crack initiation and early propagation behavior in Mg-10Gd-3Y-0.3Zr alloy
AU - He, Chao
AU - Wu, Yujuan
AU - Peng, Liming
AU - Su, Ning
AU - Chen, Qiang
AU - Yuan, Shucheng
AU - Liu, Yongjie
AU - Wang, Qingyuan
N1 - Funding Information:
This research was financially supported by the National Key Research and Development Program of China (No. 2016YFB0701201 ), the National Natural Science Foundation of China (Nos. 11602038 , 51771113 , 51671128 , 11772209 and 11572057 ), the United Fund of National Department of Education and Equipment Development (No. 6141A02033213 ), and the 111 Project (No. B16032 ). Shanghai Jiaotong University and Chengdu University are co-first units of this work. The support of Grant-in-Aid for JSPS Research Fellow (No. P16809 ) is very much appreciated. Special thanks to the Ultramicroscopy Research Center (URC) in Kyushu University for the EBSD analysis.
Funding Information:
This research was financially supported by the National Key Research and Development Program of China (No. 2016YFB0701201), the National Natural Science Foundation of China (Nos. 11602038, 51771113, 51671128, 11772209 and 11572057), the United Fund of National Department of Education and Equipment Development (No. 6141A02033213), and the 111 Project (No. B16032). Shanghai Jiaotong University and Chengdu University are co-first units of this work. The support of Grant-in-Aid for JSPS Research Fellow (No. P16809) is very much appreciated. Special thanks to the Ultramicroscopy Research Center (URC) in Kyushu University for the EBSD analysis.
Publisher Copyright:
© 2018
PY - 2019/2/1
Y1 - 2019/2/1
N2 - Microstructural cyclic deformation mechanisms and their relation to small fatigue crack initiation and early propagation behavior were experimentally investigated in a rare earth-containing magnesium alloy (Mg-Gd-Y-Zr). The results indicate that basal slip is the dominant deformation mechanism, especially in coarse grains, and eventually leads to fatigue crack initiation. Early crack propagation behavior was strongly influenced by local microstructural heterogeneities in grain size and orientation. Three kinds of microstructures—favorably-oriented coarse grains, fine grain clusters and unfavorably-oriented coarse grains—are discussed in terms of their deformation mechanisms and resistance to crack propagation. These microstructural effects caused highly variable crack propagation rates within the first ∼200 μm of cracks.
AB - Microstructural cyclic deformation mechanisms and their relation to small fatigue crack initiation and early propagation behavior were experimentally investigated in a rare earth-containing magnesium alloy (Mg-Gd-Y-Zr). The results indicate that basal slip is the dominant deformation mechanism, especially in coarse grains, and eventually leads to fatigue crack initiation. Early crack propagation behavior was strongly influenced by local microstructural heterogeneities in grain size and orientation. Three kinds of microstructures—favorably-oriented coarse grains, fine grain clusters and unfavorably-oriented coarse grains—are discussed in terms of their deformation mechanisms and resistance to crack propagation. These microstructural effects caused highly variable crack propagation rates within the first ∼200 μm of cracks.
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U2 - 10.1016/j.ijfatigue.2018.10.002
DO - 10.1016/j.ijfatigue.2018.10.002
M3 - Article
AN - SCOPUS:85055183336
SN - 0142-1123
VL - 119
SP - 311
EP - 319
JO - International Journal of Fatigue
JF - International Journal of Fatigue
ER -