Abdelali Hayoune

• Dr
• Teacher Researcher at Ecole Nationale Polytechnique de Constantine

This study examines the microstructural evolution, phase transformation, and corrosion behavior of 304L stainless steel after 50% cold rolling and annealing within a temperature range of 400–850 °C. X‐ray diffraction, scanning electron microscopy, and cyclic potentiodynamic polarization in 0.6 M NaCl are employed for analysis. Cold rolling induces...

Phase transformations in cold-rolled (CR) 304L austenitic stainless steel were studied using different techniques, including dilatometry, X-ray diffraction and scanning electron microscopy. During continuous annealing, the dilatometric measurements indicated that the evolution of the deformed microstructures led to an important anomaly constituted...

This study aims to identify internal friction (IF) peaks and to understand IF sensitivity to thermomechanical treatments in an Al alloy. The used commercial Al-Mg-Si alloy (AA6060) is subjected to two different thermomechanical cycles. The obtained results demonstrate that thermomechanical treatments have a significant effect on IF behavior. IF cur...

In this study the effect of plastic deformation on internal friction peaks in Al based alloy is discussed. For that, an Al-Mg-Si alloy (AA6060) is subjected to cold rolling with a ratio ε = 80%. For both samples (water quenched and water quenched then cold rolled), the results revealed the appearance of a peak P1 at medium temperature (∼463 K), whic...

The sequence of structural changes produced in two deformed microstructures of austenitic stainless steel elaborated by a multipass unidirectional cold rolling (CR) and a two‐step one, to a 75% thickness reduction, is followed by dilatometric experiments. The two materials show different dilatometric behaviors. X‐ray diffraction and microhardness m...

Despite the large number of studies on the development of multilayered composites using accumulative roll bonding method (ARB), there are not enough available details concerning the effect of the temperature variation on the constituent layer microstructure and the nature and kinetics of the developed intermetallic compounds. The present work aims...

The influence of thermomechanical cycles on ageing behaviour, precipitation kinetics and mechanical properties of Al6060 has been studied quantitatively and qualitatively using differential scanning calorimetry (DSC), dilatometry, X-ray diffraction (XRD) and microhardness measurements. The obtained results revealed a significant hardness increase d...

In contrast to isothermal aging, few reports document the non-isothermal aging of deformed Al–Mg–Si alloys. The knowledge of non-isothermal aging of pre-deformed Al–Mg–Si alloys is of primary importance to understand the thermal stability as well as to control the microstructure of the final product during industrial processing. Therefore, the pres...

In the present paper, the precipitation sequences that take place in an Al–Cu–Mg–Si alloy have been identified by means of dilatometry and differential scanning calorimetry (DSC). While the dilatometric curves shows nine dilatometric anomalies, the DSC scans present seven effects. By comparing these two methods, the dilatometric anomalies have been...

The effects of cold deformation and low temperature aging on the microstructural stability of a peak aged (PA) Al 6061 alloy were investigated by means of DSC and microhardness measurements. During aging at a relatively low temperature (100 °C) of the PA material, a small increasing of the mechanical properties was detected, which was explained by...

The precipitation phenomena and the related hardening in an Al–Cu–Mg–Si alloy were studied by calorimetry, X-ray diffraction analysis and microhardness measurements. The main calorimetric peaks were identified to be due to β′′, θ′ and Q′ phases precipitation. The hardening during aging at room temperature and 160°C, was respectively, explained by a...

The effect of cold deformation on the interaction between precipitation, recovery and recrystallization reactions in an Al–12wt.% Mg alloy was studied by dilatometry and high-temperature X-ray diffraction. During continuous heating of cold deformed samples, the dilatometric curves present new dilatometric anomalies which change with increasing prio...

Non-isothermal ageing of an Al–4, 5% Cu alloy has been studied by using differential dilatometry, differential scanning calorimetry (DSC) and high-temperature X-ray diffraction (HTXRD). Six anomalies have been detected on the differential thermodilatometry curve (DTD). The GP zones formation and dissolution are traduced by two small contractions fo...

The aim of the present work is to study order-disorder transformation in some alloys of the Fe-Al system (with 9.8, 21.5 and 25 at.% Al). The synthesis and the analysis of numerous and interesting results obtained by dilatometric and calorimetric analysis have allowed us to assert that the ordering reaction is a rapid process and that long ageing a...