scholarly journals Correction to: Metallurgical Parameters Controlling Fragmentation and Spheroidization Processes of Eutectic Si Particles in Al–Si Cast Alloys

2021 ◽  
Author(s):  
A. M. Samuel ◽  
M. H. Abdelaziz ◽  
H. W. Doty ◽  
F. H. Samuel
Keyword(s):  
Eutectic Si ◽  
Cast Alloys

Effect of Extended Thermal Exposure and Alloying Elements on the Morphology of Eutectic Si in Al–Si Cast Alloys

2020 ◽  
Vol 14 (4) ◽  
pp. 1013-1024 ◽  
Author(s):  
M. H. Abdelaziz ◽  
A. M. Samuel ◽  
H. W. Doty ◽  
F. H. Samuel
Keyword(s):  
Thermal Exposure ◽  
Alloying Elements ◽  
Eutectic Si ◽  
Cast Alloys

The Effect of Ni on the High-Temperature Strength of Al-Si Cast Alloys

2011 ◽  
Vol 690 ◽  
pp. 274-277 ◽  
Author(s):  
Florian Stadler ◽  
Helmut Antrekowitsch ◽  
Werner Fragner ◽  
Helmut Kaufmann ◽  
Peter J. Uggowitzer
Keyword(s):  
High Temperature ◽  
Load Transfer ◽  
Elevated Temperatures ◽  
Close Contact ◽  
Sem Analysis ◽  
High Temperature Strength ◽  
Phase System ◽  
Two Phase ◽  
Eutectic Si ◽  
Cast Alloys

In order to investigate the effect of Ni on the high-temperature strength of Al-Si cast alloys, tensile properties of hypoeutectic and eutectic alloys were determined at 250 °C after long-term annealing at test temperature. LOM- and SEM-analysis revealed the existence of Al3Ni-phases in close contact to eutectic Si. It was shown that the strength can be increased by the addition of Ni, though just to a certain level, depending on the fraction of eutectic phase in the alloy. The alloys were considered as a coarse two-phase system where a hardening effect is caused by load transfer to the harder phase, which requires a certain connectivity/contiguity of the latter. The paper describes the extent of contiguity of the eutectic as well as the hard silicon and Al3Ni-phases within the eutectic, and discusses their contribution to an enhanced strength of Al-Si alloys at elevated temperatures.

On nanoscale Al precipitates forming in eutectic Si particles in Al–Si–Mg cast alloys

2009 ◽  
Vol 61 (5) ◽  
pp. 500-503 ◽  
Author(s):  
Z.H. Jia ◽  
L. Arnberg ◽  
S.J. Andersen ◽  
J.C. Walmsley
Keyword(s):  
Eutectic Si ◽  
Cast Alloys

Effect of Iron-Rich Intermetallic and Eutectic Si Accumulation on Al-Si-Mg Alloy

2016 ◽  
Vol 848 ◽  
pp. 633-641 ◽  
Author(s):  
Ze Hao Chen ◽  
Cong Xu ◽  
Xiao Liang Hu ◽  
Zhi Guo Liu ◽  
Hiroshi Yamagata ◽  
...  
Keyword(s):  
Automotive Industry ◽  
A356 Alloy ◽  
Weight Ratio ◽  
High Strength ◽  
Artificial Ageing ◽  
Casting Alloy ◽  
Aluminum Cast Alloys ◽  
Eutectic Si ◽  
Cast Alloys ◽  
Critical Components

Al-Si-Mg alloys, an important aluminum cast alloys, are excessively used inmanufacturing of critical components due to their high strength to weight ratio, flexibility ofmanufacturing designs, economic processing and capital material cost for automotive industry. Thisresearch is aimed to study microstructure evolution including distribution and morphology ofiron-rich intermetallic, as well as eutectic Si accumulation and their effect on mechanical propertiesof Al-Si-Mg (A356) casting alloy after artificial ageing. The results show that formation of iron-richintermetallic and eutectic Si accumulation resulted in surprisingly opposite mechanical properties,especially ductility. The elongations deceased with increase of area of accumulated eutectic Si and theamount of needle-like iron-rich intermetallic. When the area of accumulated eutectic Si reached 31%of the microstructure of the A356 alloy, the strength and elongation were respectively damaged to129.69 MPa and 1.05%. Moreover, the amount of needle-like iron-rich intermetallic increased, thestrength and elongation respectively decreased.

Optimization of Eutectic Si Particles Morphology in Secondary Al-Si Cast Alloys after Different Heat Treatment

2014 ◽  
Vol 1025-1026 ◽  
pp. 349-354 ◽  
Author(s):  
Lenka Hurtalová ◽  
Eva Tillová ◽  
Mária Chalupová
Keyword(s):  
Heat Treatment ◽  
Cast Alloy ◽  
Structural Parameters ◽  
Analytical Techniques ◽  
Intermetallic Phases ◽  
Structure Parameters ◽  
Eutectic Si ◽  
Cast Alloys ◽  
Morphology Changes ◽  
Scanning Electron

Secondary cast Al-Si alloys containing more of additions elements and forming various structural parameters (intermetallic phases). The optimization of structure parameters morphology is necessary because the mechanical properties depend on changes in morphology of eutectic Si and intermetallic phases in Al-Si cast alloy. This article describes changes of eutectic Si morphology after heat treatment T4 and T6. The morphology changes were observed using combination different analytical techniques - light microscopy (upon black-white etching) and scanning electron microscopy - SEM (upon deep etching). For the experiment was used recycled (secondary) aluminium cast alloy AlSi9Cu3.

Fatigue Crack Propagation Mechanisms of Long and Small Cracks in Al-Si-Mg and Al-Mg Cast Alloys

2009 ◽  
Vol 618-619 ◽  
pp. 563-574 ◽  
Author(s):  
Diana A. Lados
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Volume Fraction ◽  
Damage Threshold ◽  
Compact Tension ◽  
Threshold Behaviour ◽  
Eutectic Si ◽  
Cast Alloys ◽  
Small Cracks

Fatigue crack growth of long and small cracks was investigated for various Al-Si-Mg and Al-Mg cast alloys. Low residual stress was ensured during processing to concentrate on microstructural effects on crack growth. Compact tension and single edge tension specimens were fatigue crack growth tested at room temperature and stress ratio, R = 0.1. Microstructure related mechanisms were used to explain the near-threshold behaviour and crack growth response in Regions II and III for each material considering relevant microstructural features such as SDAS, grain size, and volume fraction and morphology of eutectic Si. Threshold behaviour of long cracks is attributed to closure-dependent mechanisms. In Regions II and III, the changes in crack growth mechanisms were explained through correlations between the extent of the plastic zone ahead of the crack tip and material-specific microstructural damage. Threshold behaviour of small cracks is explained through closure-independent mechanisms, specifically through the barrier effects of controlling microstructural characteristics specific to each material. Recommendations for integrating materials knowledge in structural design for fatigue performance are given.

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