scholarly journals The Comparison of the Microstructure and Corrosion Resistance of Sand Cast Aluminum Alloys

2016 ◽  
Vol 61 (1) ◽  
pp. 209-212 ◽  
Author(s):  
A. Dobkowska ◽  
B. Adamczyk – Cieślak ◽  
J. Mizera ◽  
K. J. Kurzydłowski ◽  
A. Kiełbus
Keyword(s):  
Corrosion Behavior ◽  
Passive State ◽  
Chinese Script ◽  
Secondary Phases ◽  
Cast Aluminum ◽  
Sand Cast ◽  
Cast Aluminum Alloys ◽  
Different Types ◽  
Solid Solution Matrix ◽  
Solution Matrix

The influence of different types of precipitation on the corrosion behavior was investigated in three aluminum-siliconmagnesium alloys. The microstructures of the alloys were studied through optical (OM) and scanning electron microscopy (SEM). The structures consisted of an α-Al solid solution matrix, Si eutectic crystals, secondary phases AlFeSi and AlMgFeSi (Chinese script), as well as Mg2Si. The corrosion behavior was examined with the use of a potentiodynamic polarization test followed by a SEM surface analysis. The results indicate that all the analyzed samples were in the passive state and AlSi10Mg was less reactive in the corrosive environment.

Friction Stir Processing in Wrought and Cast Aluminum Alloys

2013 ◽  
Vol 765 ◽  
pp. 741-745 ◽  
Author(s):  
Ye Cao ◽  
Diana A. Lados
Keyword(s):  
Fatigue Crack ◽  
Friction Stir Processing ◽  
Aluminium Alloys ◽  
Combined Effects ◽  
Secondary Phases ◽  
Cast Aluminum ◽  
Growth Behaviour ◽  
Crack Growth Behaviour ◽  
Friction Stir ◽  
Cast Aluminum Alloys

Friction Stir Processing (FSP) of various aluminium alloys including wrought 6061 and cast A356, 319, and A390 have been systematically investigated in this study. The effects of processing on microstructure, hardness, tensile properties, and fatigue crack growth behaviour of the alloys were studied. The alloys were judiciously selected to understand the effects of Si level, type, and morphology, and to evaluate the contributions of different secondary phases and strengthening precipitates. Individual and combined effects of these microstructural features were also assessed. The results will be presented and discussed.

scholarly journals The Role of Acoustic Pressure during Solidification of AlSi7Mg Alloy in Sand Mold Casting

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 490 ◽  
Author(s):  
H. Puga ◽  
J. Barbosa ◽  
V. H. Carneiro
Keyword(s):  
Acoustic Pressure ◽  
Melt Processing ◽  
Cast Aluminum ◽  
Sand Cast ◽  
Cast Aluminum Alloys ◽  
Mold Casting ◽  
Acoustic Radiator ◽  
The Face ◽  
Numerical Approaches

New alloy processes have been developed and casting techniques are continuously evolving. Such constant development implies a consequent development and optimization of melt processing and treatment. The present work proposes a method for studying the influence of acoustic pressure in the overall refinement of sand cast aluminum alloys, using and correlating experimental and numerical approaches. It is shown that the refinement/modification of the α-Al matrix is a consequence of the acoustic activation caused in the liquid metal directly below the face of the acoustic radiator. Near the feeder, there is a clear homogeneity in the morphology of the α-Al with respect to grain size and grain circularity. However, the damping of acoustic pressure as the melt is moved away from the feeder increases and the influence of ultrasound is reduced, even though the higher cooling rate seems to compensate for this effect.

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Effect of nanoparticle reinforcement on mechanical properties and erosion–corrosion behavior of cast aluminum

2019 ◽  
Vol 61 (7) ◽  
pp. 667-673 ◽  
Author(s):  
Osama M. Irfan ◽  
Mohammad A. Irfan ◽  
Fahad A. Almufadi
Keyword(s):  
Mechanical Properties ◽  
Corrosion Behavior ◽  
Cast Aluminum ◽  
Erosion Corrosion

scholarly journals Corrosion Behavior, Microstructure and Mechanical Properties of Novel Mg-Zn-Ca-Er Alloy for Bio-Medical Applications

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 519
Author(s):  
Devadas Bhat Panemangalore ◽  
Rajashekhara Shabadi ◽  
Manoj Gupta
Keyword(s):  
Mechanical Properties ◽  
Corrosion Behavior ◽  
Base Material ◽  
Hot Extrusion ◽  
Secondary Phases ◽  
Zinc Alloys ◽  
Alloying Additions ◽  
Degradation Rates ◽  
Master Alloys ◽  
Melt Deposition

In this study, the effect of calcium (Ca) and erbium (Er) on the microstructure, mechanical properties, and corrosion behavior of magnesium-zinc alloys is reported. The alloys were prepared using disintegrated melt deposition (DMD) technique using the alloying additions as Zn, Ca, and Mg-Er master alloys and followed by hot extrusion. Results show that alloying addition of Er has significantly reduced the grain sizes of Mg-Zn alloys and also when compared to pure magnesium base material. It also has substantially enhanced both the tensile and the compressive properties by favoring the formation of MgZn2 type secondary phases that are uniformly distributed during hot-extrusion. The quaternary Mg-Zn-Ca-Er alloy exhibited the highest strength due to lower grain size and particle strengthening due to the influence of the rare earth addition Er. The observed elongation was a result of extensive twinning observed in the alloys. Also, the degradation rates have been substantially reduced as a result of alloying additions and it is attributed to the barrier effect caused by the secondary phases.

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