Marking Oxide Films on the Section of Al-XSi Alloys by Ultrasonic-vibration Treatment

Chen, Yeong Jern; Huang, Li; Shih, Teng Shih

doi:10.2320/matertrans.44.1190

Cited by 8 publications

(12 citation statements)

References 17 publications

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“…Comparison of diagnosing oxide films in cast aluminum and magnesium alloys The description of diagnosing oxide films in cast aluminum alloys proposed by Huang 8) and Chen et al 9,10) that associated with previous results are summarized in Table 2. Cavitation bubbles are readily at the sites neighboring with oxide film, such as the interface of different oxides where the bubbles readily collapse.…”

Section: 6mentioning

confidence: 99%

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Diagnosis and Analysis of Oxide Films in Cast Magnesium Alloys by Ultrasonic-Vibration Treatment

Chen

Wei

2007

Mater. Trans.

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Magnesium alloys with low density are important light metals, widely used in the aerospace and automotive industries and in the manufacture of communication devices, consumer-electronics appliances and computers products in recent years. However magnesium and magnesium alloys are the most reactive metals so that oxide films easily form on them during the melting or pouring process. These films are difficult to observe by optical micrograph. In this study we propose a simple method to observe oxide films entrapped in cast magnesium alloys. The oxide films are fractured as a result of cavitation erosion on the sample surface that occurs during ultrasonic-vibration treatment. The eroded areas become visible as differently shaped foggy marks. This method of observing and identifying foggy marks is shown to be useful in the diagnosis of oxide films in cast magnesium alloys. In addition, the presented method in the diagnosis of oxide films that formed on magnesium and aluminum alloys are also compared.

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Section: 6mentioning

confidence: 99%

“…Oxide films are relatively difficult to identify based on optical-microscope observations. Huang 8) and Chen 9,10) et al proposed an ultrasonic-vibration method for the diagnosis of oxide films entrapped in cast aluminum alloys. The principles of the method are based on the phenomena of acoustic cavitation.…”

Section: Introductionmentioning

confidence: 99%

Diagnosis and Analysis of Oxide Films in Cast Magnesium Alloys by Ultrasonic-Vibration Treatment

Chen

Wei

2007

Mater. Trans.

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“…Ultrasonic-vibration treatment was used to diagnose the oxide films entrapped in the sample. 6,20) A polished specimen was set on the bottom of the vessel. The vessel was filled with distilled water to a volume of 500 to 600 ml.…”

Section: Methodsmentioning

confidence: 99%

Ultrasonic Evaluation of the Quality of A356.2 Alloy by Fluxing Treatment

Chen

2010

Mater. Trans.

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Aluminum alloys are often contaminated with non-metallic inclusion particles that react easily with oxygen or moisture, oxidizing to form oxide films. These inclusions and oxides can lead to the formation of porosity as well as significantly reduce the corrosion resistance and mechanical properties of aluminum alloy castings. Fluxing treatment is one of the conventional methods for removing inclusions and oxides from the melt to enhance the quality of aluminum alloy castings.In this study, we use four covering fluxes in fluxing treatments and investigate the quality of A356.2 alloy. The percentage of porosity is an accepted way to quantitatively evaluate the quality of aluminum alloy castings. In this study, the relative porosity, as represented by the percentage of porosity in A356.2 alloy is evaluated. Nondestructive ultrasonic techniques are adopted to investigate the relative porosity of A356.2 alloy samples produced by the various flux treatments. The relationship between the relative porosity and ultrasonic characteristics, including the ultrasonic velocity and the attenuation coefficient, are determined and compared, and the pore formation and oxide film distribution in the alloy are also discussed.

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“…[16][17][18] A polished specimen was set on the bottom of the vessel. The vessel was filled with distilled water to a volume of 500 to 600 ml.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Ultrasonic Treatment on Microstructural and Mechanical Properties of Cast Magnesium Alloys

2009

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Magnesium alloys are important light metals. In recent years, they have been widely applied in the aerospace and automotive industries, and in the manufacture of communication devices, consumer-electronics appliances and computer products. However, cast magnesium and magnesium alloys are subject to problems due to gas pores, inclusion particles, oxide films, and so on. How to reduce the harm caused by these defects and refine the structure to improve casting quality has become an important topic. In this study, we evaluate the effect on casting quality of an ultrasonic method for treating the melt. The method is based on the generation of cavitation bubbles from ultrasonic treatment of the melt, which induces dispersion and degassing action. Analysis of the microstructure and determination of the mechanical properties of the resultant castings are the basis for identifying the quality of the magnesium and magnesium alloys. The microstructure was evaluated using an optical microscope and scanning electron microscopy (SEM). The elemental constituents of the inclusion particles and oxide films were identified using scanning electron microscopy in conjunction with an X-ray energy dispersive spectrometer and electron probe microanalyzer (EPMA). Finally, the mechanical properties of the magnesium and magnesium alloys, including the tensile strength, the elongation and the hardness, were also determined and discussed. In addition, variations in mechanical properties of cast aluminum and magnesium alloys by ultrasonic treatment are also discussed.

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Marking Oxide Films on the Section of Al-XSi Alloys by Ultrasonic-vibration Treatment

Cited by 8 publications

References 17 publications

Diagnosis and Analysis of Oxide Films in Cast Magnesium Alloys by Ultrasonic-Vibration Treatment

Diagnosis and Analysis of Oxide Films in Cast Magnesium Alloys by Ultrasonic-Vibration Treatment

Ultrasonic Evaluation of the Quality of A356.2 Alloy by Fluxing Treatment

The Effect of Ultrasonic Treatment on Microstructural and Mechanical Properties of Cast Magnesium Alloys

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