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Microstructural evolution and high-temperature compressive properties of an extruded Mg–Dy–Zn alloy sheet

  • Guangli Bi , Yuxiang Han , Jing Jiang , Xiaomei Luo , Chunhong Jiang , Xiaofeng Huang , Chi Cao , Yuandong Li and Ying Ma
Published/Copyright: August 30, 2018
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Abstract

Microstructural evolution and compressive properties of an extruded Mg-2Dy-0.5Zn (at.%) alloy sheet at 350°C were investigated. As the compressive strain increased, the volume fraction of dynamic recrystallization increased, the fine lamellar 14H long period stacking ordered phase precipitated in the dynamic recrystallization grain, and the Mg12ZnDy phase with an 18R long period stacking ordered structure gradually bent. These secondary phases not only acted as nucleation sites to promote dynamic recrystallization but also restrained grain growth by inhibiting dislocation movement and grain boundary sliding. The compressive yield strength, ultimate compressive strength, and compressive strain of the alloy sheet were 161 MPa, 212 MPa, and 12.4% at 350°C, respectively. The high compressive strengths were mainly attributed to grain refinement, kink band strengthening of the 18R long period stacking ordered phase and precipitation strengthening of the fine lamellar 14H long period stacking ordered phase in the dynamic recrystallization grain.


*Correspondence address, Prof. Guangli Bi, State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Qilihe District Langongping Road 287#, 730050, Lanzhou, P. R. China, Tel.: +86-931-2973564, E-mail: (G.L.B.)

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Received: 2017-12-23
Accepted: 2018-04-05
Published Online: 2018-08-30
Published in Print: 2018-09-14

© 2018, Carl Hanser Verlag, München

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