scholarly journals Solidification of iron-rich intermetallic phases and their effects on tensile properties in Al-Cu 206 cast alloys /

2012 ◽  
Author(s):  
Kun Liu
Keyword(s):  
Tensile Properties ◽  
Intermetallic Phases ◽  
Cast Alloys

Effect of Additions of SiC and Al2O3 Particulates on the Microstructure and Tensile Properties of Al–Si–Cu–Mg Cast Alloys

2016 ◽  
Vol 10 (3) ◽  
pp. 253-263 ◽  
Author(s):  
Jacobo Hernandez-Sandoval ◽  
Agnes M. Samuel ◽  
Fawzy H. Samuel ◽  
Salvador Valtierra
Keyword(s):  
Tensile Properties ◽  
Cast Alloys

The Failure Degradation of Recycled Aluminium Alloys with High Content of β-Al5FeSi Intermetallic Phases

2020 ◽  
Vol 403 ◽  
pp. 97-102
Author(s):  
Denisa Medvecká ◽  
Lenka Kuchariková ◽  
Milan Uhríčik
Keyword(s):  
Aluminium Alloys ◽  
Cast Alloy ◽  
Intermetallic Phases ◽  
X Ray ◽  
Fracture Surfaces ◽  
Phase Lead ◽  
Micro Cracks ◽  
Fe Content ◽  
Increased Risk ◽  
Cast Alloys

In this study, the effect of the β-Al5FeSi phases on fracture surfaces in secondary AlSi7Mg0.3 cast alloys with common and higher amount of iron was investigated. Iron addition caused the formation of different Fe-rich intermetallic phases in aluminium alloys. Components made of secondary aluminium alloys commonly have a higher amount of such phases. Sharp needles as β-Al5FeSi phase lead to initiate stress tension, thereby contributing to increased risk of micro-cracks formation on the fracture surfaces. To determine the effect of β-Al5FeSi to fracture surfaces of AlSi7Mg0.3 cast alloy, SEM microscopy with energy-dispersive X-ray spectroscopy (EDX) was used to study the amount of needles phases, their morphology and violation wave. It was found that increasing Fe content increased the size and the number of Al5FeSi phases. The fractographic analysis of fracture surfaces shows an increasing amount of cleavage fracture in materials with a higher amount of iron, too.

The Influence of Fluid Flow on Intermetallic Phases in Al-Cast Alloys

2006 ◽  
Vol 519-521 ◽  
pp. 1795-1800 ◽  
Author(s):  
Sonja Steinbach ◽  
Natasja Euskirchen ◽  
Victor T. Witusiewicz ◽  
Laszlo Sturz ◽  
Lorenz Ratke
Keyword(s):  
Fluid Flow ◽  
Strong Influence ◽  
Primary Dendrite ◽  
Spatial Arrangement ◽  
Intermetallic Phases ◽  
Rotating Magnetic Field ◽  
Flow Conditions ◽  
Fe And Mn ◽  
Cast Alloys ◽  
Scientific Results

Technical Al-Si alloys always contain sufficient amounts of Fe and Mn, especially alloys made from scrap. During casting, Fe-containing intermetallics, such as Al-Fe, Al-Fe-Si and Al-Fe- Mn-Si phases, are formed between the aluminum dendrites. Fe and Mn-rich intermetallic phases are well known to be strongly influential on mechanical properties in Al-Si alloys. In the present work the influence of controlled fluid flow conditions on the morphology and spatial arrangement on intermetallic phases in cast Al-Si alloys is characterized. A binary Al-7wt.%Si and a ternary Al- 7wt.%Si-1wt.%Fe alloy was solidified under and without the influence of a rotating magnetic field (3mT at 50Hz) over a range of solidification velocities (0.015- 0.18mm/s) at a constant temperature gradient G of 3K/mm. The scientific results reached so far indicate a strong influence of the electromagnetic stirring on the primary dendrite and secondary dendrite arm spacings.

The Effect of Alloy Addition on the High Temperature Properties of Over-Aged Al-Si(CuNiMg) Cast Alloys

2006 ◽  
Vol 519-521 ◽  
pp. 461-466 ◽  
Author(s):  
Young Hee Cho ◽  
Dae Heon Joo ◽  
Chul Hyun Kim ◽  
Hu Chul Lee
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Volume Fraction ◽  
Metastable Phase ◽  
Intermetallic Phases ◽  
Alloying Elements ◽  
High Temperature Strength ◽  
Transition Elements ◽  
Cast Alloys ◽  
Equilibrium Phases

The role of alloying elements in the improvement of the high temperature strength of Al-12Si(CuNiMg) cast alloys used for automotive piston applications was investigated. The addition of alloying elements such as Mn, Cr, Ti and Ge was studied and the detailed characterization of the composition and morphology of the constituent phases after over aging at 350 for 1000 hrs was performed. The compositions and volume fractions of the equilibrium phases determined by thermodynamic calculation were compared with the experimental results. The addition of transition elements, including Mn, Cr and Ti, increased the volume fraction of the intermetallic phases, which effectively enhanced the high temperature strength of the alloys. Among these transition elements, Mn turned out to be the most effective alloying element. After adding up to 0.5wt% of Mn, a large number of intermetallic phases, α-Al(Mn,Fe)Si as well as fine Al6(Mn,Fe) particles were precipitated and a significant improvement in the elevated temperature properties was achieved. The addition of Ge promoted the precipitation of the θphase (metastable phase, θ-Al2Cu), due to the formation of GeSi precipitates, thereby improved the mechanical properties of the alloy after T6 heat treatment. However, the presence of these GeSi precipitates did not affect the coarsening of the θ phase to form Qphase( Al5Cu2Mg8Si6) during aging and, thus, the elevated temperature properties were not improved by the addition of Ge.

Influence of a Novel Master Alloy Addition on the Grain Refinement of Al-Si Cast Alloys

2013 ◽  
Vol 765 ◽  
pp. 311-315 ◽  
Author(s):  
Leandro Bolzoni ◽  
Magdalena Nowak ◽  
N. Hari Babu
Keyword(s):  
Grain Refinement ◽  
Master Alloy ◽  
Intermetallic Phases ◽  
Al Alloys ◽  
Grain Structure ◽  
Grain Refiner ◽  
Casting Alloys ◽  
Alloy Addition ◽  
Cast Alloys ◽  
The Impact

The grain refinement practice using Ti based chemical additions is well established for wrought Al alloys, especially in the last few decades. In the case of Al-Si casting alloys the practice of adding grain refiners and the impact on castability is not well established in industries. The main reason is the chemical instability of conventionally known Ti based grain refiner which reacts with silicon forming intermetallic phases. Recently, researchers at Brunel University have identified a novel chemical composition that can refine the grain structure of Al-Si alloys in an effective way. Over the last year, this novel grain refiner in the form of master alloy was developed and tested in various Al-Si cast alloys that are commonly used in industry. Significant grain refinement is obtained when the master alloy is added to the liquid metal prior to casting. Moreover, the grain size of the Al-Si cast alloys is observed to be less sensitive to cooling rate when the master alloy is added. In this work, the influence of addition of the master alloy on microstructural evolution of various Al-Si alloys cast under various cooling rates is presented.

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