Effect of Pre-Strain on the Fatigue Behavior of Extruded AZ31 Alloys

International Conference on Materials Sciences and Nanomaterials

材料科学;物理学

Wu, Yanjun^1

Department of Mechanical Engineering, Nanjing Communications Institute of Technology, Nanjing, China^1

关键词: Axial fatigue tests;    AZ31 magnesium alloy;    Fatigue behavior;    Fatigue deformation;    Hysteresis energies;    Low cycle fatigues;    Plastic deformation mechanisms;    Tensile loading;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/230/1/012005/pdf
DOI  :  10.1088/1757-899X/230/1/012005

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

An attempt is made to rationalize the effect of pre-strain history on fatigue behaviors of AZ31 magnesium alloy. Axial fatigue tests were conducted in the extruded and pre-compressioned AZ31 alloy under low cycle total strain control fatigue conditions. The pre-strain process influences the plastic deformation mechanism activated during fatigue deformation, especially during tensile loading, by enhancing the activity of detwinning mechanism. The low-cycle fatigue lifetime of extruded AZ31 alloy can be enhanced by the pre-compression process. And the hysteresis energy was successfully used to predict the low-cycle fatigue lifetime.