Effects of mean stress on ratcheting behavior of extruded AZ31B magnesium alloy

HAN Chongtao; SONG Linghui; DUAN Guosheng; WU Baolin

doi:10.7527/S1000-6893.2021.26060

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2022 , Vol. 43 >Issue 12: 426060 - 426060

DOI: https://doi.org/10.7527/S1000-6893.2021.26060

Material Engineering and Mechanical Manufacturing

Effects of mean stress on ratcheting behavior of extruded AZ31B magnesium alloy

HAN Chongtao ,
SONG Linghui ,
DUAN Guosheng ,
WU Baolin

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1. School of Safety Engineering, Shenyang Aerospace University, Shenyang 110136, China;
2. Key Laboratory for High Strength Lightweight Metallic Materials of Shandong Province, Advanced Materials Institute of Shandong Academy of Sciences, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China

Received date: 2021-07-05

Revised date: 2021-07-27

Online published: 2021-08-17

Supported by

National Natural Science Foundation of China (51901140); Natural Science Foundation of Liaoning Province (2019-ZD-0238)

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Abstract

The uniaxial ratcheting behaviors of an extruded AZ31B magnesium alloy was investigated with a series of compression-compression cyclic stress-controlled experiments at ambient temperature. Effects of different mean stresses on the ratcheting stress and its evolution were examined. The mechanism of dominant plastic deformation under mean stress and its effect on the ratcheting behavior in the process of cyclic deformation were discussed. Results show that remarkable ratcheting behavior occurs in the extruded AZ31B magnesium alloy in the process of compression-compression cycles. Instead of the dislocation slip, the twinning-detwinning mechanism plays a key role in the formation of ratcheting strain and determines the rate of ratcheting strain. When the mean stress is 0, -45, -75, -135 MPa, the ratcheting strain formed in the cyclic process increases with the increase of the compressive mean stress, and tends to be stable after a certain number of cycles. The ratcheting strain rate decreases sharply with the increase of the number of cycles until it remains unchanged.

Key words： ratcheting behavior; stress-controlled; mean stress; deformation mechanism; AZ31B

Cite this article

HAN Chongtao , SONG Linghui , DUAN Guosheng , WU Baolin . Effects of mean stress on ratcheting behavior of extruded AZ31B magnesium alloy[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022 , 43(12) : 426060 -426060 . DOI: 10.7527/S1000-6893.2021.26060

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