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Data from Brunel University Provide New Insights into Metallurgy

May 27, 2014



By a News Reporter-Staff News Editor at Journal of Technology -- Investigators publish new report on Metallurgy. According to news reporting from Uxbridge, United Kingdom, by VerticalNews journalists, research stated, "Aluminum alloy 7050 is known for its superior mechanical properties, and thus finds its application in aerospace industry. Vertical direct-chill (DC) casting process is typically employed for producing such an alloy."

The news correspondents obtained a quote from the research from Brunel University, "Despite its advantages, AA7050 is considered as a 'hard-to-cast' alloy because of its propensity to cold cracking. This type of cracks occurs catastrophically and is difficult to predict. Previous research suggested that such a crack could be initiated by undeveloped hot tears (microscopic hot tear) formed during the DC casting process if they reach a certain critical size. However, validation of such a hypothesis has not been done yet. Therefore, a method to produce a hot tear with a controlled size is needed as part of the verification studies. In the current study, we demonstrate a method that has a potential to control the size of the created hot tear in a small-scale solidification process. We found that by changing two variables, cooling rate and displacement compensation rate, the size of the hot tear during solidification can be modified in a controlled way. An X-ray microtomography characterization technique is utilized to quantify the created hot tear. We suggest that feeding and strain rate during DC casting are more important compared with the exerted force on the sample for the formation of a hot tear. In addition, we show that there are four different domains of hot-tear development in the explored experimental window-compression, microscopic hot tear, macroscopic hot tear, and failure."

According to the news reporters, the research concluded: "The samples produced in the current study will be used for subsequent experiments that simulate cold-cracking conditions to confirm the earlier proposed model."

For more information on this research see: Formation of Hot Tear Under Controlled Solidification Conditions. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2014;45A(6):2855-2862. Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science can be contacted at: Springer, 233 Spring St, New York, NY 10013, USA.

Our news journalists report that additional information may be obtained by contacting T. Subroto, Brunel University, BCAST, Uxbridge UB8 3PH, Middx, United Kingdom. Additional authors for this research include A. Miroux, L. Bouffier, C. Josserond, L. Salvo, M. Suery, D.G. Eskin and L. Katgerman.

Keywords for this news article include: Europe, Uxbridge, Metallurgy, United Kingdom

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Journal of Technology


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