ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Effect of texture on fatigue properties of AZ31B under stress-controlled conditions
Received date: 2024-10-15
Revised date: 2024-11-08
Accepted date: 2025-01-07
Online published: 2025-01-16
Supported by
National Natural Science Foundation of China(51901140)
Extruded magnesium alloys have been widely used as structural components in aerospace industry， within which the texture has a significant effect on the safety and reliability of magnesium alloys in the process of application. Under stress-controlled cyclic loading conditions， the ｛0001｝ basal texture has a significant effect on the deformation mechanism， ratcheting strain and fatigue life during cyclic deformation.Samples with two kinds of textures were prepared parallel to the Extrusion Direction （ED） and Perpendicular to the Extrusion Direction （TD）， respectively， and selected for comparative experiments at different stress levels. The results show that the texture has a significant effect on the cyclic deformation process and fatigue process of extruded magnesium alloys. At the early stage of cycling， the dominant deformation mechanism of ED samples is twinning mechanism， while the TD samples are dominated by dislocation slip， and the ratcheting strain generated in ED is large. As the cycling progresses， the dominant deformation mechanism of both ED and TD samples is transformed into dislocation deformation mechanism， and the hindering effect of residual twins on dislocations leads to more pronounced cyclic hardening in ED samples relative to TD samples. The random distribution for c-axis of TD samples on the TD surface determines that more dislocations and twins can be initiated in TD samples relative to ED samples. As a result， the TD samples exhibit greater ratchet strain， plastic strain amplitude， and plastic strain energy density compared to the ED samples which ultimately leads to shorter fatigue life.
Key words： stress-controlled; texture; ratchet; deformation mechanism; fatigue life
Rongxiang CHENG , Guosheng DUAN , Yueying ZHANG , Heyu WEI , Baolin WU . Effect of texture on fatigue properties of AZ31B under stress-controlled conditions[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2025 , 46(12) : 431401 -431401 . DOI: 10.7527/S1000-6893.2024.31401
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