B. Alili

Grain growth in AZ31 alloy after uniaxial compression

The grain growth morphology, kinetics and texture change after uniaxial compression at 430 °C of an extruded AZ31 alloy were studied. The samples were loaded following two routes insuring two initial textures of the samples with compression direction parallel and normal to the extrusion direction. For both initial textures, a stable grain size is attained upon isothermal annealing and the grain growth kinetics can be described by: dn = dnR + kt with an n value of around 15. The annealing texture with grown grains is a retained hot deformation texture without emerging or strengthening other components. Abnormal grain growth is not observed for annealing time up to 10 000 h at 450 °C.

X-ray diffraction analysis of cold-worked Cu-Ni-Si and Cu-Ni-Si-Cr alloys by Rietveld method

Abstract Cold worked and annealed supersaturated Cu-2.65Ni-0.6Si and Cu-2.35Ni-0.6Si-0.6Cr alloys were studied. The microstructural parameters evolution, including crystallite size, root mean square strain and dislocation density was analyzed using Materials Analysis Using Diffraction software (MAUD). The parameters for both alloys have typical values of cold deformed and subsequently annealed copper based alloy. A net change of the crystallite size, root mean square strain and dislocation density values of the alloys aged at 450 °C for 2.5–3 h seems corresponding to the recovery and recrystallization processes. Addition of Cr as quaternary element did not lead to any drastic changes of post deformation or ageing microstructural parameters and hence of recovery-recrystallization kinetics.

X-ray peak profile analysis of dislocation type, density and crystallite size distribution in cold deformed Pb-Ca-Sn alloys

Abstract The density, nature of the dislocations and distribution of the domain sizes in cold-deformed Pb-Ca-Sn solid solution were determined by X-ray diffraction profile analysis. The dislocation densities are of the order of 10 10 cm −2 . The strain broadening of diffraction profiles was accounted for by dislocation contrast factor. The coherent domain size was determined by the recently developed PM2K software package. Assuming that the domain size distribution is log-normal, the distribution function (median μ and variance σ) was calculated from the size parameters determined from X-ray diffraction profile analysis.

DSC analysis of commercial Cu–Cr–Zr alloy processed by equal channel angular pressing

Abstract Samples of a commercial Cu–1Cr–0.1Zr (mass fraction, %) alloy were subjected to equal channel angular pressing (ECAP) up to 16 passes at room temperature following route Bc. Differential scanning calorimetry (DSC) was used to highlight the precipitation sequence and to calculate the stored energy, recrystallization temperature and activation energy after each ECAP pass. On another hand, electrical properties were correlated with the dislocation density. Results show that the stored energy increases upon increasing ECAP pass numbers, while the recrystallization temperature decreases significantly.

Deformation and recrystallization texture,microstructure and kinetics of Pb-Ca-Sn alloy

A Pb-0.08Ca-2Sn alloy was subjected to rolling at room temperature to different final thicknesses. Annealing treatments at temperature ranging from 80 to 120 °C led to recrystallization of the samples as shown by resistivity and micro-hardness measurements. The deformation texture determined through X-ray diffraction is qualitatively the Brass type. The measured Lankford anisotropy parameter R and its evolution are close to the determined one using a self consistent approach. The R value evolution with angle to rolling direction shows the presence of planar anisotropy and poor drawability. The recrystallization in annealing at 80−120 °C is achieved within time period up to 3×10 4 s. The recrystallization texture is a retained deformation texture with an emerging