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 trace additions of Ag to binary Al-Mg alloys promote precipitation of a phase in theunder-aged condition. The structure of the phase in an Al-10Mg-0.5Ag (mass%) alloy have beencharacterised using transmission electron microscopy and electron microdiffraction. An icosahedralquasicrystalline phase, which is identified by the electron microdiffraction patterns, has been foundin the Al-10Mg-0.5Ag (mass%) alloy after solution treatment, water quenched and then aged duringthe time between 20 and 40 min. at 513K. The orientation relationship between the quasicrystallinephase and the a - Al matrix is as follows; i5 // 〈011〉a and i3 // 〈111〉a. A uniform distribution offiner-scale (typically 20 nm), faceted precipitate icosahedral quasicrystalline particles was observedwithin the core of the grains, but the precipitates became coarser (60-80 nm) approaching the grainboundary precipitate-free zone. The quasicrystalline particles contain elements of Al, Mg and Ag.The quasicrystalline precipitate particles, which are the metastable phase, appear to be the primarystrengthening phase in the Al-10Mg-0.5Ag (mass%) alloy aged at 513K
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.561.pdf
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