Aluminium casting alloys

The aluminium casting alloys are mostly based on the Al-Si system (phase diagram Fig. A1.31). It is a classic eutectic system, with a eutectic point at about 11% Si and... 

Figure A1.53 shows the aluminium-silicon system, basis of most aluminium casting alloys. 

M.J. Couper et al Casting defects and the fatigue behaviour of an aluminium casting alloy. Fatigue Fract. Eng. Mat. Struct. 13, 213-227 (1990)... 

Structure and Basic Mechanical Properties of Aluminium Casting Alloys... 

Fig. 3.1-36 Ranges of tensile strength for some important aluminium casting alloys [ 1.9]...

Due to the widespread use of aluminium casting alloys, the casting techniques have been... 

Tubing for domestic gas distribution grids have been manufactured in 6060 tubes. Burners of gas cookers are in aluminium casting alloys. 

The bath is normally at a temperature in the range 620-710°C, depending on whether the coating material is an aluminium-silicon alloy (for use in high-temperature conditions) or pure aluminium (for corrosion prevention). It is heated by inductors, by resistance heaters or by an external flame. The pot will usually be refractory lined unless cast-iron pots are needed to ensure adequate heat transfer from an external flame. As molten aluminium is extremely aggressive towards ferrous metals, replacement of cast-iron pots is fairly frequent. Refractory-lined pots obviously do not have this drawback, although the bath hardware, in particular the sinker roll and support mechanism, will still be attacked and need replacement at intervals. 

Casting Casting around steel parts, which are first hot dipped in aluminium or in aluminium-silicon alloy (the Al-Fin process), gives good bonding but requires careful design because of the different thermal-expansion coefficients of the two metals. 

Aluminium alloys form one of the most widely used groups of materials in existence. They make products which are often cheap and can be applied to many different areas. Extensive work has been done on the experimental determination of binary and ternary phase diagrams, mainly during the mid-part of this century, and researchers such as Phillips (1961) and Mondolfo (1976) have produced detailed reviews of the literature which provide industry standard publications. However, although some important Al-alloys are based on ternary systems, such as the LM2S/ 356 casting alloy based on Al-Mg-Si, in practice they inevitably include small amounts of Cu, Mn, Fe, Ti etc., all of which can significantly modify the castability and properties of the final product. The situation is further exacerbated by the use of scrap material. It is therefore useful to be able to predict phase equilibria in multi-component alloys. 

Firstly, a kinetic Monte Carlo (kMC) [8] for the nano-structural evolution of so-called spongy nickel from the constituent intermetallic phases present in nickel-aluminium precursor alloys is described. Experimental data concerning nano-porous nickel catalyst powder used in this paper are derived from leached NiAl alloy powder produced via a spray-atomization route rather than the conventional cast-and-crushed route. 

The five photographs in Plates m and HIa show the micrographic appearance of the five casting alloys of aluminium that have been studied. 

The results are shown in Fig. 60, which should be considered side by side with those obtained under the same conditions for aluminium and casting alloys. 

Magnesimn-alloyed-aluminium casting Bentonite Boric acid... 

---