TY - JOUR

T1 - Designing Mg alloys with high strength and ductility by reducing the strength difference between the basal and non-basal slips

AU - Zhou, Shibo

AU - Liu, Tingting

AU - Tang, Aitao

AU - Huang, Yuanding

AU - Peng, Peng

AU - Zhang, Jianyue

AU - Hort, Norbert

AU - Willumeit-Römer, Regine

AU - Pan, Fusheng

N1 - This research was funded by National Natural Science Foundation of China (02110023210043, 51971042, U2167213). The authors would like to thank joint lab for electron microscopy of Chongqing University. This work was supported by Sinoma Institute of Materials Research (Guang Zhou) Co., Ltd (SIMR). The China Scholarship Council is also gratefully acknowledged for financial support for Shibo Zhou (202106050089). Publisher Copyright: © 2022 The Author(s)

PY - 2023/1/1

Y1 - 2023/1/1

N2 - The additions of alloying elements can significantly improve the mechanical properties of magnesium (Mg) alloys, mainly due to the fact that their additions change the critical shear stresses (CRSS) for dislocation slips. In this work, experimental and computational methods were used to explore the mechanisms responsible for the roles of Sm element addition in affecting the mechanical properties of Mg. The results showed that the addition of Sm obviously improves the microstructure and mechanical properties. It promotes the formation of twins and beneficially activated the non-basal slip at the initial stage of plastic deformation, resulting in a high ductility. The Visco-Plastic Self-Consistent (VPSC) and the two-beam diffraction results confirmed that the pyramidal slip and prismatic slip were activated during tensile testing. The quantitative analysis of slip traces verified that the volume of non-basal slips reached 35 % after Sm addition. The additions of Sm with solid solution increased the activities of pyramidal dislocation during deformation, which was beneficial to accommodate the c-axis strain, and finally improved the room temperature ductility of Mg. First-principle calculations demonstrate that the solute Sm atoms would reduce the stacking fault energy for basal and prismatic slips.

AB - The additions of alloying elements can significantly improve the mechanical properties of magnesium (Mg) alloys, mainly due to the fact that their additions change the critical shear stresses (CRSS) for dislocation slips. In this work, experimental and computational methods were used to explore the mechanisms responsible for the roles of Sm element addition in affecting the mechanical properties of Mg. The results showed that the addition of Sm obviously improves the microstructure and mechanical properties. It promotes the formation of twins and beneficially activated the non-basal slip at the initial stage of plastic deformation, resulting in a high ductility. The Visco-Plastic Self-Consistent (VPSC) and the two-beam diffraction results confirmed that the pyramidal slip and prismatic slip were activated during tensile testing. The quantitative analysis of slip traces verified that the volume of non-basal slips reached 35 % after Sm addition. The additions of Sm with solid solution increased the activities of pyramidal dislocation during deformation, which was beneficial to accommodate the c-axis strain, and finally improved the room temperature ductility of Mg. First-principle calculations demonstrate that the solute Sm atoms would reduce the stacking fault energy for basal and prismatic slips.

KW - Magnesium alloy

KW - Deformation mechanism

KW - Ductility

KW - <c+a> dislocation

KW - CRSS

KW - Engineering

UR - http://www.scopus.com/inward/record.url?scp=85143671999&partnerID=8YFLogxK

U2 - 10.1016/j.matdes.2022.111476

DO - 10.1016/j.matdes.2022.111476

M3 - Journal articles

VL - 225

JO - Materials and Design

JF - Materials and Design

SN - 0264-1275

M1 - 111476

ER -