ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The atomic bonding of the segregated cell of Al-Li alloy in earlier ageing condition wascalculated according to the empirical electron theory (EET) in solid. The results showed that thestrongest covalent bond was the Al-Al bond in the segregated cell without vacancy, while thestrongest covalent bond was the Al-Li bond in the cell containing vacancy. Since the difference ofelectronagativity between the Al and Li atoms was obvious, it was inclined to form the Al-Lisegregated cell of short range order structure in the condition of vacancy joining. The short rangeorder structure with vacancy was probably the embryo or precursor structure of the metastable phase' δ (Al3Li). As the ' δ (Al3Li) was coherence with matrix, the bond net strength was enhanced by theprecipitation of ' δ (Al3Li) and hence the alloy was strengthened
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.819.pdf
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