Influence of nanodispersions on strength–ductility properties of semisolid cast A356 Al alloy

El-Mahallawi, I.; Eigenfeld, K.; Mahmoud, T. S.; Ragaie, R. M.; Shash, Ahmed Y.; Saeed, Muhammad

doi:10.1179/174328409x441229

Cited by 31 publications

(22 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Prospects of using nanoparticles as refining and reinforcement agents to gain improved performance of Al-Si cast alloys by adding Al2O3 and TiO2 particles have gained significant interest recently [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that enhanced as-cast properties of Al-Si alloys are obtained by treating the melt with nano-sized particles [16][17][18][19][20][21][22]. Introducing Al2O3 nanoparticles to the (A356) cast alloy in the semi-solid state with mechanical stirring has a beneficial effect on improving the strength-ductility relationship in these alloys [16,17].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanoreinforced Cast Al-Si Alloys with Al2O3, TiO2 and ZrO2 Nanoparticles

El-Mahallawi

Shash

Amer

2015

Metals

View full text Add to dashboard Cite

This study presents a new concept of refining and enhancing the properties of cast aluminum alloys by adding nanoparticles. In this work, the effect of adding alumina (Al2O3), titanium dioxide (TiO2) and zirconia (ZrO2) nano-particles (40 nm) to the aluminum cast alloy A356 as a base metal matrix was investigated. Alumina, titanium dioxide and zirconia nano-powders were stirred in the A356 matrix with different fraction ratios ranging from (0%-5%) by weight at variable stirring speeds ranging from (270, 800, 1500, 2150 rpm) in both the semisolid (600 °C) and liquid (700 °C) state using a constant stirring time of one minute. The cast microstructure exhibited change of grains from dendritic to spherical shape with increasing stirring speed. The fracture surface showed the presence of nanoparticles at the interdendritic spacing of the fracture surface and was confirmed with EDX analysis of these particles. The results of the study showed that the mechanical properties (strength, elongation and hardness) for the nanoreinforced castings using Al2O3, TiO2 and ZrO2 were enhanced for the castings made in the semi-solid state (600 °C) with 2 weight% Al2O3 and 3 weight% TiO2 or ZrO2 at 1500 rpm stirring speed.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nanoreinforced Cast Al-Si Alloys with Al2O3, TiO2 and ZrO2 Nanoparticles

El-Mahallawi

Shash

Amer

2015

Metals

View full text Add to dashboard Cite

show abstract

“…5, showing that the ED process for copper on large alumina particles can be difficult. Our previous study [19] indicated that the quality of copper coating on larger micron sized particles is not as good as on smaller particles. It was reported previously that the deposition time for smaller particles was higher than that for larger particles, indicating that finer particles have more time to be exposed to the deposition process [20].…”

Section: Resultsmentioning

confidence: 95%

“…Stir casting in the semi-solid state is the most frequently used method for production of particulate AMMCs [9][10][11][12][13][14][15][16][17][18][19]. Coating or oxidizing the reinforcement particles, adding some surface-active elements such as magnesium into the matrix, and stirring of metal matrix alloy for an adequate time period during incorporation are some ways used in the semi-solid stir casting process to aid particle incorporation and chemical bonding with the matrix [5,7,13,[20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of rolled A356 based composites reinforced by Cu-coated bimodal ceramic particles

et al. 2015

View full text Add to dashboard Cite

ab s t r a c tThree kinds of A356 based composites reinforced with 3 wt.% Al2O3 (average particle size: 170 lm), 3 wt.% SiC (average particle size: 15 lm), and 3 wt.% of mixed Al2O3-SiC powders (a novel composite with equal weights of reinforcement) were fabricated in this study via a two-step approach. This first process step was semi-solid stir casting, which was followed by rolling as the second process step. Electroless deposition of a copper coating onto the reinforcement was used to improve the wettability of the ceramic particles by the molten A356 alloy. From microstructural characterization, it was found that coarse alumina particles were most effective as obstacles for grain growth during solidification. The rolling process broke the otherwise present fine silicon platelets, which were mostly present around the Al2O3 particles. The rolling process was also found to cause fracture of silicon particles, improve the distribution of fine SiC particles, and eliminate porosity remaining after the first casting process step. Examination of the mechanical properties of the obtained composites revealed that samples which contained a bimodal ceramic reinforecment of fine SiC and coarse Al2O3 particles had the highest

show abstract

“…The investigation [15] studies the prospects of using nanoparticles as reinforcement agents to gain improved performance of A356 Al cast alloy by adding up to 5 % Al 2 O 3 and TiO 2 particles. The particles size was intentionally reduced from 10 mm to 500 nm and to 40 nm.…”

Section: Mmcs Production Technologiesmentioning

confidence: 99%