Properties of Free-Machining Aluminum Alloys at Elevated Temperatures

Autor:	Jiří Faltus, Miroslav Karlík, Petr Haušild
Rok vydání:	2012
Předmět:	Differential scanning calorimetry Materials science Scanning electron microscope Liquid metal embrittlement Charpy impact test Izod impact strength test Fractography Composite material Intergranular corrosion Embrittlement
Zdroj:	ICAA13 Pittsburgh ISBN: 9783319482255 ICAA13: 13th International Conference on Aluminum Alloys
DOI:	10.1007/978-3-319-48761-8_130
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e6e52c86a2b9c4c3bd3a634e9ca45b0d https://doi.org/10.1007/978-3-319-48761-8_130 Zobrazit plný text záznamu