- Cogan, S.F. and Gayle, F.W. and Klein, J.D. and Cocks, F.H. and Shepard, M.L., Extraction and X-ray analysis of phases in aluminium alloys,
J. Mater. Sci. (UK), vol. 13 no. 12
pp. 2687 - 91 [BF00552699] .
(last updated on 2007/04/10)
The extraction of precipitates and second phase insoluble intermetallic compounds or metalloid compounds from three commercial aluminium alloys was achieved by anodic dissolution of the aluminium alloy matrix in a methanolic electrolyte containing benzoic acid, oxine and chloroform. Aluminium alloy 7075 containing principally Al-Zn-Mg-Cu, alloy 6061 containing principally Al-Si, and alloy 2011 containing principally Al-Cu were investigated. X-ray diffraction of the extracted residues using the Debye-Scherrer method, identified the compounds MnAl6, MgO and Mg2Si in the 7075 alloy in the aged condition, the insoluble phase Mn12Si7Al5 in the 6061 alloy in both the solution heat-treated and aged conditions. In the 2011 alloy the primary precipitate, CuAl2, was extracted in the aged condition and the lattice parameters for this tetragonal compound were determined to be a=6.064 Å and c=4.874 Å. Metallic bismuth also was identified in the extraction from this alloy. Several lines, believed to represent an unknown ternary or higher compound, could not be identified
ageing;aluminium alloys;anodisation;copper alloys;magnesium alloys;precipitation;silicon alloys;solution annealing;X-ray diffraction examination of materials;zinc alloys;