Faiz Haj Hasan - Academia.edu (original) (raw)

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Papers by Faiz Haj Hasan

The distribution, morphology, chemistry, and crystallography of the precipitates formed during ag... more The distribution, morphology, chemistry, and crystallography of the precipitates formed during aging of an Al-Cu-Zn-Mg-Ag alloy have been studied using analytical transmission electron microscopy. The first precipitates to appear during aging at 150°C were thin hexagonalshaped plate-like precipitates which formed on the {lll}Al planes. These precipitates had a facecentred orthorhombic crystal structure and their composition was essentially CuA1, although they contained a trace of silver. At peak hardness the microstructure consisted of the plate-like precipitates on {lll}Al planes and 0' precipitates on {lOO}A1 planes. Overaging resulted in the precipitation of equilibrium 8, CuAl,, which exhibited a lath morphology and a n orientation-relationship with the matrix (210)Al 1 I (llOIy; (OO1)A1 misoriented from (OOl), by-6". Prolonged overaging at 250°C resulted in the formation of cuboid-shaped Al,(Cu,Zn),Mg, precipitates which had a cubic crystal structure and a cube:cube orientation-relationship with the matrix.

The distribution, morphology, chemistry, and crystallography of the precipitates formed during ag... more The distribution, morphology, chemistry, and crystallography of the precipitates formed during aging of an Al-Cu-Zn-Mg-Ag alloy have been studied using analytical transmission electron microscopy. The first precipitates to appear during aging at 150°C were thin hexagonalshaped plate-like precipitates which formed on the {lll}Al planes. These precipitates had a facecentred orthorhombic crystal structure and their composition was essentially CuA1, although they contained a trace of silver. At peak hardness the microstructure consisted of the plate-like precipitates on {lll}Al planes and 0' precipitates on {lOO}A1 planes. Overaging resulted in the precipitation of equilibrium 8, CuAl,, which exhibited a lath morphology and a n orientation-relationship with the matrix (210)Al 1 I (llOIy; (OO1)A1 misoriented from (OOl), by-6". Prolonged overaging at 250°C resulted in the formation of cuboid-shaped Al,(Cu,Zn),Mg, precipitates which had a cubic crystal structure and a cube:cube orientation-relationship with the matrix.

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