锻压技术

超声波能流密度对Zr基非晶合金常温塑性性能的影响

英文标题：Influence of ultrasonic energy flow density on the plastic properties of zirconium-based amorphous alloy at room temperature

作者：刘芳平刘晓娄燕

单位：深圳大学

关键词：超声波辅助振动非晶合金超声波能流密度塑性性能有限元模拟

分类号：TG139.8

出版年,卷(期):页码：2019,44(4):162-170

摘要：

采用频率为20 kHz及振幅分别为0，19，27，36和43 μm的超声辅助振动，对Zr基非晶合金进行微压缩预处理，然后进行准静态压缩断裂试验，对断口进行扫描电镜（SEM）观察，使用ABAQUS模拟该过程，并基于超声波能流密度I表征对Zr基非晶合金常温塑性性能的影响。结果表明：Zr基非晶合金变形区域发生剪切变形，以韧性断裂起主要作用；随着振幅或频率增大，弹性模量降低，等效应力分布更加均匀，应变增大，塑性变形越好，成形能力提高；当能流密度I超过9.41×108 W·m-2 左右时，非晶合金的可成形性随着超声波能流密度I的增大而降低。

Micro-compression pre-treatment of Zr-based amorphous alloy was conducted by ultrasonic-assisted vibration with the frequency of 20 kHz and the amplitudes of 0, 19, 27, 36 and 43 μm, respectively. Then, the quasi-static compression fracture test was carried out, and the fractures were observed by high-resolution scanning electron microscopy. Next, the process was simulated by ABAQUS, and the influence of ultrasonic energy flow density on the plastic properties of Zr-based amorphous alloy at room temperature was studied. The results show that the shear deformation occurs in the deformed zone of Zr-based amorphous alloy, and the ductile fracture plays a major role. With the increasing of ultrasonic amplitude and frequency, the elastic modulus decreases, the equivalent stress distribution is more uniform, the strain increases, the plastic deformation is better and the formability increases. However, it is found that the formability of amorphous alloy decreases with the increasing of ultrasonic energy flow density when the energy flow density is above 9.41×108 W·m-2 approximately.

基金项目：

国家自然科学基金资助项目（51675347）；广东省自然科学基金资助项目（2016A030313058）；深圳市科技项目（JCYJ20160308091758179）

刘芳平（1996-），男，硕士研究生 E-mail：2170295804@email.szu.edu.cn 通讯作者：娄燕（1971-），女，博士，教授 E-mail：susanlou121@163.com

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