Abstract
In areas close to the cutting tool the workpieces being dry machined could be heated up to 350°C and they may be impact loaded. Therefore it is of interest to study mechanical properties of corresponding materials at elevated temperatures. Free-machining alloys of Al-Cu and Al-Mg-Si systems containing Pb, Bi and Sn additions (AA2011, AA2111B, AA6262, and AA6023) were subjected to Charpy U notch impact test at the temperatures ranging from 20 to 350°C. The tested alloys show a sharp drop in notch impact strength KU at different temperatures. This drop of KU is caused by liquid metal embrittlement due to the melting of low-melting point dispersed phases which is documented by differential scanning calorimetry. Fracture surfaces of the specimens were observed using a scanning electron microscope. At room temperature, the fractures of all studied alloys exhibited similar ductile dimple fracture micromorphology, at elevated temperatures, numerous secondary intergranular cracks were observed.
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© 2012 TMS (The Minerals, Metals & Materials Society)
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Faltus, J., Karlík, M., Haušild, P. (2012). Properties of Free-Machining Aluminum Alloys at Elevated Temperatures. In: Weiland, H., Rollett, A.D., Cassada, W.A. (eds) ICAA13 Pittsburgh. Springer, Cham. https://doi.org/10.1007/978-3-319-48761-8_130
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DOI: https://doi.org/10.1007/978-3-319-48761-8_130
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48225-5
Online ISBN: 978-3-319-48761-8
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