Search results for: H.R. Ammar

Items from 1 to 7 out of 7 results

article

Friction stir welding of similar and dissimilar AA7075 and AA5083

M.M.Z. Ahmed, Sabbah Ataya, M.M. El-Sayed Seleman, H.R. Ammar, more

Journal of Materials Processing Technology > 2017 > 242 > C > 77-91

Aluminum alloys AA7075-T6 and AA5083-H111 were friction stir welded at constant rotation rate of 300rpm and different traverse speeds of 50,100, 150, and 200mm/min in similar and dissimilar joints. The microstructures and crystallographic textures of base materials (BM) and the welds were investigated using electron backscatter diffraction (EBSD) technique. The mechanical properties were evaluated...

article

On the impact toughness of Al-15 vol.% B4C metal matrix composites

M.F. Ibrahim, H.R. Ammar, A.M. Samuel, M.S. Soliman, more

Composites Part B: Engineering > 2015 > 79 > C > 83-94

The present work was performed on ten metal matrix composites (MMCs) produced using the new powder injection technique. These MMCs were divided into two series in which pure aluminum was the matrix for one series, while an experimental 6063 alloy was the matrix for the second series. Small amounts of Ti, Zr and Sc were added to those composites, either individually or combined. In all cases the volume...

article

Effects of aging parameters on the quality of 413-type commercial alloys

H.R. Ammar, C. Moreau, A.M. Samuel, F.H. Samuel, more

Materials and Design > 2009 > 30 > 4 > 1014-1025

The use of quality indices and charts to determine the quality of aluminum alloys in terms of their mechanical properties has gained prominence in recent times, although studies reported in the literature have concentrated mainly on Al–Si–Mg and Al–Si–Mg–Cu systems. Eutectic Al–Si alloys such as the 413 alloys investigated in this study are another important class of aluminum alloys used in industrial...

article

Influences of alloying elements, solution treatment time and quenching media on quality indices of 413-type Al–Si casting alloys

H.R. Ammar, C. Moreau, A.M. Samuel, F.H. Samuel, more

Materials Science & Engineering A > 2008 > 489 > 1-2 > 426-438

Quality charts were generated using four models of quality indices in order to evaluate the mechanical properties and quality of T4-treated 413-type Al–Si casting alloys. The purpose of this study is to investigate the influence of a number of parameters on the mechanical properties and quality of 413-type alloys. These parameters are the addition of the alloying elements Sr, Mg, Cu, Ag, Zn, La, Ce...

article

Porosity and the fatigue behavior of hypoeutectic and hypereutectic aluminum–silicon casting alloys

H.R. Ammar, A.M. Samuel, F.H. Samuel

International Journal of Fatigue > 2008 > 30 > 6 > 1024-1035

The fatigue behavior of five Al–Si casting alloys under the influence of microstructural heterogeneities was investigated for the present study. The silicon content of these alloys ranged from 7 to 17%, and includes hypoeutectic LP PM319-F, A356-T6 and C354-T6 alloys and hypereutectic AE425 and PM390 alloys, as used extensively in automotive applications. Compression–tension fatigue tests were carried...

article

Effect of casting imperfections on the fatigue life of 319-F and A356-T6 Al–Si casting alloys

H.R. Ammar, A.M. Samuel, F.H. Samuel

Materials Science & Engineering A > 2008 > 473 > 1-2 > 65-75

Casting imperfections, such as porosity, in cast aluminum components greatly influence their fatigue properties. The effect of porosity on the fatigue life of 319-F and A356-T6 aluminum alloys was studied, where the porosity characteristics on the fracture surfaces of fatigue-tested samples were examined using SEM and image analysis. The results show that porosity has the greatest detrimental effect...

article

Effects of surface porosity on the fatigue strength of AE425 and PM390 hypereutectic Al–Si casting alloys at medium and elevated temperatures

H.R. Ammar, A.M. Samuel, F.H. Samuel

Materials Science & Engineering A > 2008 > 473 > 1-2 > 58-64

The effects of surface porosity on the fatigue life of AE425 and PM390 hypereutectic Al–Si casting alloys were investigated at medium and elevated temperatures (150°C and 300°C, respectively) for the purposes of the present study. Surface porosity was found to be the most critical casting defect which influenced the fatigue life of hypereutectic alloys at medium and elevated temperatures. The most...

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Keywords

MECHANICAL PROPERTIES (3)
413-TYPE AL–SI CASTINGS (2)
ALLOYING ELEMENTS (2)
FATIGUE (2)
POROSITY (2)
QUALITY INDICES (2)
A. METAL-MATRIX COMPOSITES (MMCS) (1)
AE425 AND PM390 HYPEREUTECTIC AL–SI CASTING ALLOYS (1)
AGING PARAMETERS (1)
ALUMINUM ALLOYS (1)
ALUMINUM–SILICON CASTINGS (1)
AL–SI CASTING ALLOYS (1)
B. FRACTURE TOUGHNESS (1)
B. MICROSTRUCTURES (1)
CRYSTALLOGRAPHIC TEXTURE (1)
D. FRACTOGRAPHY (1)
E. CASTING (1)
EBSD (1)
FATIGUE STRENGTH (1)
FRICTION STIR WELDING (1)
GRAIN STRUCTURE (1)
HYPEREUTECTIC (1)
HYPOEUTECTIC (1)
INTERMETALLIC PHASES (1)
MODIFICATION (1)
QUALITY CHARTS (1)
QUALITY MAPS (1)
QUENCHING MEDIA (1)
SLIP-BANDS (1)
SOLUTIONZING TIME (1)
SURFACE POROSITY (1)
T6-TEMPER (1)
TESTING TEMPERATURE (1)
more

Journal

Materials Science & Engineering A (3)
Composites Part B: Engineering (1)
International Journal of Fatigue (1)
Journal of Materials Processing Technology (1)
Materials and Design (1)

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Search results for: H.R. Ammar

Friction stir welding of similar and dissimilar AA7075 and AA5083

On the impact toughness of Al-15 vol.% B4C metal matrix composites

Effects of aging parameters on the quality of 413-type commercial alloys

Influences of alloying elements, solution treatment time and quenching media on quality indices of 413-type Al–Si casting alloys

Porosity and the fatigue behavior of hypoeutectic and hypereutectic aluminum–silicon casting alloys

Effect of casting imperfections on the fatigue life of 319-F and A356-T6 Al–Si casting alloys

Effects of surface porosity on the fatigue strength of AE425 and PM390 hypereutectic Al–Si casting alloys at medium and elevated temperatures

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