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Influence of High Frequency Vibration on Deep Drawing Process of AZ31 Sheet at Room Temperature 被引量:8

Influence of High Frequency Vibration on Deep Drawing Process of AZ31 Sheet at Room Temperature
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摘要 Quasi-ultrasonic vibration with a frequency of 15 kHz and a maximum output of 2 kW was imposed on the deep drawing process of AZ31 magnesium alloy sheet at room temperature,in order to reveal the effect of high frequency vibration on deformation behavior of AZ31 during the process.From the drawn results and the observation of the microstructure within the large deformation area,high frequency vibration has a great influence on the formability,the forming load and the failure mode of AZ31 sheet during the deep drawing process;the influence is a comprehensive result of so-called "volume effect" and "surface effect",and relies on the vibrating amplitude.Total forming load decreased significantly as soon as the vibration superimposed.According to the tensile test results of AZ31 bars under ultrasonic vibration,the formability of AZ31 sheet increases firstly with the increase of stimulating energy,then decreases and finally becomes brittle.Under the combined influence of "surface effect" and the "softening" in the "volume effect" near the relative low amplitude of 25%A in the experiment(A is the maximum amplitude),the formability of AZ31 reaches the largest value,and the samples possess the same distribution trend of cracks as those added with lubricating oil.With the increase of excitation energy,the "volume effect" gradually becomes apparent,and finally the "hardening" of the "volume effect" occupies a dominant position. Quasi-ultrasonic vibration with a frequency of 15 kHz and a maximum output of 2 kW was imposed on the deep drawing process of AZ31 magnesium alloy sheet at room temperature, in order to reveal the effect of high frequency vibration on deformation behavior of AZ31 during the process. From the drawn results and the observation of the microstructure within the large deformation area, high frequency vibration has a great influence on the formability, the forming load and the failure mode of AZ31 sheet during the deep drawing process; the influence is a comprehensive result of so-called "volume effect" and "surface effect", and relies on the vibrating amplitude. Total forming load decreased significantly as soon as the vibration superimposed. According to the tensile test results of AZ31 bars under ultrasonic vibration, the formability of AZ31 sheet increases firstly with the increase of stimulating energy, then decreases and finally becomes brittle. Under the combined influence of "surface effect" and the "softening" in the "volume effect" near the relative low amplitude of 25%A in the experiment (A is the maximum amplitude), the formability of AZ31 reaches the largest value, and the samples possess the same distribution trend of cracks as those added with lubricating oil. With the increase of excitation energy, the "volume effect" gradually becomes apparent, and finally the "hardening" of the "volume effect" occupies a dominant position. Key words: magnesium alloy, high frequency vibration, deep drawing, formability
出处 《Journal of Shanghai Jiaotong university(Science)》 EI 2012年第4期456-460,共5页 上海交通大学学报(英文版)
基金 the Fundamental Research Funds for the Central Universities (No.CDJZR10110029)
关键词 magnesium alloy high frequency vibration deep drawing FORMABILITY magnesium alloy, high frequency vibration, deep drawing, formability
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