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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of ultrasonic treatment on microstructure and tensile strength of AZ91 magnesium alloy
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Effects of ultrasonic treatment on microstructure and tensile strength of AZ91 magnesium alloy

机译：超声处理对AZ91镁合金组织和拉伸强度的影响

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摘要

In this study, the effects of ultrasonic treatment on microstructural features and tensile strength of AZ91 magnesium alloy were investigated. AZ91 melts were subjected to ultrasonic waves of different power levels for 5 min using an ultrasonic device with frequency of about 20 kHz and maximum power of 600 W and cast in sand moulds. The results showed that ultrasonic treatment of the melt prior to casting had a significant effect on the size and sphericity of á-Mg dendrites as well as on the size, continuity, sphericity and distribution of intermetallic particles formed during cooling and solidification of the alloy. Increasing the applied ultrasonic power resulted in smaller, more rounded and better distributed grains and particles. The microstructural effects were mainly attributed to the cavitation and streaming phenomena which took place during ultrasonic treatment in the melt. Tensile strength of the alloy was significantly improved by ultrasonic treatment of the melt. Discontinuity and refinement of Mg_(17)Al_(12) particles in the ultrasonically treated samples is thought to be the main reason for this improvement. The paper also examines different possible mechanisms responsible for microstructural modification of different phases under ultrasonic treatment conditions.
机译：在这项研究中，研究了超声波处理对AZ91镁合金的组织特征和拉伸强度的影响。使用频率大约为20 kHz，最大功率为600 W的超声波设备，对AZ91熔体施加不同功率水平的超声波5分钟，然后浇铸在砂模中。结果表明，浇铸前对熔体进行超声处理对á-Mg枝晶的尺寸和球形度以及对合金冷却和凝固过程中形成的金属间颗粒的尺寸，连续性，球形度和分布都有显着影响。增加施加的超声波功率会导致更小的，更圆的和更好的分布的颗粒。微观结构效应主要归因于在熔体中进行超声处理期间发生的空化和流动现象。通过对熔体进行超声波处理，可以显着提高合金的拉伸强度。超声处理样品中Mg_（17）Al_（12）颗粒的不连续性和细化被认为是这种改进的主要原因。本文还研究了在超声处理条件下负责不同相微结构改性的不同可能机理。

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