TY - JOUR
T1 - Regulating twin boundary mobility by annealing in magnesium and its alloys
AU - Cui, Yujie
AU - Li, Yunping
AU - Wang, Zhongchang
AU - Lei, Qian
AU - Koizumi, Yuichiro
AU - Chiba, Akihiko
N1 - Funding Information:
The authors would like to thank Yuichiro Hayasaka for the help of TEM observations. The authors appreciate the financial support from Grant-in-Aid for Young Scientists (B) (Grant No. 24686069 ) of MEXT , support from ICC-IMR, Tohoku University , and grant from the State Key Lab for Powder Metallurgy, Central South University, China .
Publisher Copyright:
© 2017 Elsevier Ltd.
PY - 2017/12
Y1 - 2017/12
N2 - We combine pre-compressive test, reverse tensile test, re-compressive test, in-situ electron back-scattered diffraction, and high-resolution transmission electron microscopy to systematically investigate the effect of annealing on the reciprocal motion of twin boundary (TB) in pure Mg and Mg alloys AZ31 and AZ91. We find that the twin boundary mobility (TBM) can be enhanced by decreasing the dislocation density and increasing the number of coherent TBs after annealing for a short time. On the other hand, after prolonged annealing in Mg alloys, TBM decreases since TBs are stabilized by segregated solute atoms and precipitates. As a result, the TBM significantly depends on both the alloying element content and the annealing time. We demonstrate, for the first time, that friction stress and back stress can be applied to clarify the variation of TBM during annealing in Mg alloys. Our findings show that the TBM can be regulated by annealing, opening up a novel avenue for developing Mg alloys with high damping capacity or enhanced mechanical properties.
AB - We combine pre-compressive test, reverse tensile test, re-compressive test, in-situ electron back-scattered diffraction, and high-resolution transmission electron microscopy to systematically investigate the effect of annealing on the reciprocal motion of twin boundary (TB) in pure Mg and Mg alloys AZ31 and AZ91. We find that the twin boundary mobility (TBM) can be enhanced by decreasing the dislocation density and increasing the number of coherent TBs after annealing for a short time. On the other hand, after prolonged annealing in Mg alloys, TBM decreases since TBs are stabilized by segregated solute atoms and precipitates. As a result, the TBM significantly depends on both the alloying element content and the annealing time. We demonstrate, for the first time, that friction stress and back stress can be applied to clarify the variation of TBM during annealing in Mg alloys. Our findings show that the TBM can be regulated by annealing, opening up a novel avenue for developing Mg alloys with high damping capacity or enhanced mechanical properties.
KW - Detwinning
KW - EBSD
KW - HRTEM
KW - Mechanical testing
KW - Microstructure
KW - Twinning
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U2 - 10.1016/j.ijplas.2017.08.002
DO - 10.1016/j.ijplas.2017.08.002
M3 - Article
AN - SCOPUS:85028399933
SN - 0749-6419
VL - 99
SP - 1
EP - 18
JO - International Journal of Plasticity
JF - International Journal of Plasticity
ER -