Effects of ultrasonic vibration on microstructure evolution and elevated-temperature mechanical properties of hot-extruded Mg-6Al-0.8Zn-2.0Sm wrought magnesium alloys

Hu, Zhi; Li, Xiao; Yan, Hong; Wu, Xiaoquan; Qun, Hua; Lin, Jingwu

doi:10.1016/j.jallcom.2016.05.210

Cited by 29 publications

(11 citation statements)

References 19 publications

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“…This shows that TiB 2 particles are pulled out of the matrix under the action of external loading in the region where the interface binding capacity is weak, which is a typical case when the particles separate from the matrix interface. Besides, the presence of these particles will affect the morphology and size of the dimples and cleavage surfaces, and ultimately affect the tensile strength of the composites [28]. Fractured particles exist in dimples or near tearing edges, which indicates that after UVT for 120 s, the particles are bonded tightly with the matrix.…”

Section: Resultsmentioning

confidence: 99%

Effects of High-Intensity Ultrasound on Microstructure and Mechanical Property of In situ TiB2/2A14 Composites

Huang

Jiang

et al. 2019

Metals

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In situ TiB2/2A14 composites with a 3% volume fraction were prepared by mixing salt reaction and high energy ultrasound. The effects of high-intensity ultrasonic on the microstructure and mechanical properties of TiB2/2A14 composites were systematically investigated. The microstructures of the composites were analyzed using scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD). The phase composition was examined by X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS). The results showed that after introducing ultrasonic vibration into the melt, due to the cavitation and acoustic streaming effect, the particle agglomerations were significantly reduced and particles of different sizes were evenly dispersed in the matrix. With ultrasonic vibration treatment of 120 s, the agglomerations were basically eliminated, and the particles were uniformly distributed to the most. The yield strength, tensile strength and elongation of the composites were increased by 53%, 21% and 30%, respectively, compared with that without ultrasonic vibration treatment (UVT).

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Section: Resultsmentioning

confidence: 99%

Effects of High-Intensity Ultrasound on Microstructure and Mechanical Property of In situ TiB2/2A14 Composites

Huang

Jiang

et al. 2019

Metals

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“…This is because many Al 2 Sm particles with size of ~200 nm dispersed in the matrix were too small to measure, as shown in Figure 5b, resulting in an apparent decrease in the Al 2 Sm particle volume fraction. Previous research [23] revealed that the maximum pressure caused by transient cavitation was far greater than the shear strength of the Al 2 Sm phase, causing the coarse petal-shaped Al 2 Sm phase to break apart from the roots of the petals and form finer polygonal particles in the alloy melts. The volume fraction and average diameter of the Al 2 Sm phase in the alloy after ultrasound treatment were obviously decreased.…”

Section: Resultsmentioning

confidence: 99%

Effect of Samarium on the Microstructure and Corrosion Resistance of AZ91 Magnesium Alloy Treated by Ultrasonic Vibration

et al. 2018

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The effects of samarium (Sm) on the microstructure and corrosion behavior of AZ91 magnesium alloy treated by ultrasonic vibration were investigated by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and electrochemical measurements. The results showed that the addition of Sm resulted in the formation of Al2Sm, which reduced the volume fraction of the β-Mg17Al12 phase and changed its morphology to fine granular. The AZ91–Sm alloys treated by ultrasonic vibration revealed relatively lower weight loss, hydrogen evolution, and corrosion current density values compared to the ultrasonic-treated AZ91 alloy prepared without Sm. Locally, a coarse β phase in the ultrasonic-treated AZ91 alloy accelerated the possibility of micro-galvanic corrosion growing into the matrix. In the prepared AZ91–Sm alloys treated by ultrasonic vibration, the fine β and Al2Sm phases reduced the probability of micro-galvanic corrosion growth and, therefore, formed a uniform corrosion layer on the surface of the alloys.

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“…The results showed that the conventional weld of Q345 steel has a distinct micro-hardness gradient and columnar grains, while ultrasonic impact-treated weld was characterized by a uniform micro-hardness and equiaxed grains [ 16 ]. Hu et al [ 17 ] reported the influences of ultrasonic treatment on elevated-temperature tensile strength and the microstructure evolution of hot-extruded Mg–6Al–0.8Zn–2.0Sm wrought Mg alloy. The experimental results revealed that the morphology of Al 2 Sm phase was fine granular after ultrasonic vibration treatment.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Strengthening Mechanism of Galvanized Steel/Mg Alloy Joint Obtained by Ultrasonic Vibration-Assisted Welding Process

Yang

Liu

2021

Materials

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A novel ultrasonic vibration-assisted welding (UVAW) process was used to achieve reliable joining of galvanized steel and Mg alloy. The effects of the UVAW technique on the microstructure and mechanical properties of galvanized steel/Mg alloy weldment were studied in detail. The introduction of ultrasonic vibration can ameliorate the wetting of welds and eliminate porosity defects. A refined microstructure of the fusion welding zone with an average grain size of 39 ± 1.7 μm was obtained and attributed to cavitation and acoustic streaming caused by the UVAW process. The grain refinement led to an increase in the microhardness and joining strength of the galvanized steel/Mg alloy weldment. Under the ultrasonic power of 0.9 kW and a current of 65 A, the maximum joining strength of the ultrasound-treated galvanized steel/Mg alloy joint was 251 ± 4.1 MPa, which was a 14.6% increase over the joint without ultrasonic treatment.

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Effects of ultrasonic vibration on microstructure evolution and elevated-temperature mechanical properties of hot-extruded Mg-6Al-0.8Zn-2.0Sm wrought magnesium alloys

Cited by 29 publications

References 19 publications

Effects of High-Intensity Ultrasound on Microstructure and Mechanical Property of In situ TiB2/2A14 Composites

Effects of High-Intensity Ultrasound on Microstructure and Mechanical Property of In situ TiB2/2A14 Composites

Effect of Samarium on the Microstructure and Corrosion Resistance of AZ91 Magnesium Alloy Treated by Ultrasonic Vibration

Microstructure Evolution and Strengthening Mechanism of Galvanized Steel/Mg Alloy Joint Obtained by Ultrasonic Vibration-Assisted Welding Process

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