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<p>Multi-direction forging (MDF) was used for the preparation of fine-grained AZ31 magnesium alloy. The uniaxial ratcheting behaviors were studied by conducting stress-controlled cyclic experiments under various loading conditions in ambient air. When elastic strain dominates ratcheting deformation, ratcheting strain keeps constant during cycling and is sensitive to mean stress. When dislocation slipping dominates, ratcheting deformation is similar to that of other metals. And MDF alloy shows high ratcheting strain than extruded counterpart due to significant dislocation activity at the same normalized loading conditions. When twinning involved, it can decrease the ratcheting strain, but aggravate fatigue lifetime due to increased accumulated cyclic damage and prior crack initiation sites. In addition, a modified energy-based model, which takes account for both the effects of tensile and compressive strain energy, was proposed to well predict the ratcheting lifetime of the AZ31 alloys.</p>

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Ratcheting Deformation and Fatigue of Mg-3Al-1Zn Magnesium Alloy Processed by Multi-direction Forging

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Shun He,
  • Ying Zhong,
  • Yanjun Wu,
  • Rong Zhu

摘要

Multi-direction forging (MDF) was used for the preparation of fine-grained AZ31 magnesium alloy. The uniaxial ratcheting behaviors were studied by conducting stress-controlled cyclic experiments under various loading conditions in ambient air. When elastic strain dominates ratcheting deformation, ratcheting strain keeps constant during cycling and is sensitive to mean stress. When dislocation slipping dominates, ratcheting deformation is similar to that of other metals. And MDF alloy shows high ratcheting strain than extruded counterpart due to significant dislocation activity at the same normalized loading conditions. When twinning involved, it can decrease the ratcheting strain, but aggravate fatigue lifetime due to increased accumulated cyclic damage and prior crack initiation sites. In addition, a modified energy-based model, which takes account for both the effects of tensile and compressive strain energy, was proposed to well predict the ratcheting lifetime of the AZ31 alloys.