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This alloy conforms to BS 1490:1988 LM24.
CHEMICAL COMPOSITION
| % | % | % | |||
|---|---|---|---|---|---|
| Copper | 3.0-4.0 | Magnesium | 0.3 max | Silicon | 7.5-9.5 max |
| Iron | 1.3 max | Manganese | 0.5 max | Nickel | 0.5 max |
| Zinc | 3.0 max | Lead | 0.3 max | Tin | 0.2 max |
| Titanium | 0.2 max | Aluminum | Remainder | Others: each | 0.50 max |
MECHANICAL PROPERTIES OF ALUMINIUM DIE CASTING ALLOY LM24
| GRAVITY DIE CAST | HIGH PRESSURE DIE CASTING | |
|---|---|---|
| 0.2% Proof Stress (N/mm2) | 100-120 | 150 |
| Tensile Strength (N/mm2) | 180 | 320 |
| Elongation (%) | 1.5 | 1-3 |
| Impact resistance Izod (Nm) | - | 3.4 |
| Brinell Hardness | 85 | 85 |
| Modulus of Elasticity (x103 N/mm2) | 71 | 71 |
| Shear Strength (N/mm2) | - | 185 |
STRENGTH AT ELEVATED TEMPERATURES
Room temperature tensile electricity is basically retained as much as temperatures withinside the order of 150°C, and about halved at 250°C. It need to be stated that different elements might also additionally limition the usage of die casting at improved temperatures.
PHYSICAL PROPERTIES OF ALUMINIUM DIE CASTING ALLOY LM24
| Coefficient of Thermal Expansion (per °C @ 20-100°C) | 0.000021 |
| Thermal conductivity (cal/cm2/cm/°C @ 25°C) | 0.23 |
| Electrical conductivity (% copper standard @ 20°C) | 24 |
| Density (g/cm3) | 2.79 |
| Freezing range (°C) approx. | 580-520 |
MACHINABILITY
Machining exercise is much like that for different Aluminium castings alloys containing Silicon. Whilst there isn't the tendency to tug related to excessive silicon alloys including LM6, device put on is extra fast than withinside the case of alloys containing notably small quantities of Silicon. The use of carbide-tipped gear is usually recommended however a terrific end may be acquired with excessive velocity gear. Lower alloy metallic gear can be used, supplied they may be regularly reground to preserve a pointy reducing edge. A reducing lubricant and coolant have to be employed.
CORROSION RESISTANCE
Resistance to assault beneathneath regular atmospheric situations is just like that of alloy LM4, i.e. pretty good. In marine atmospheres, or beneathneath different intense situations, castings have to be covered via way of means of painting.
ANODISING
Anodising remedy through both the chromic or sulphuric acid manner produces an anodic movie grey in color. The floor of a strain diecasting on this alloy could now no longer normally be appropriate for ornamental anodising. Anodising could be essential if this alloy is to be used in a corrosive environment.
APPLICATIONS AND GENERAL NOTES
LM24 is basically a stress die casting aluminium alloy, for which it has super casting traits and is typically a bit less difficult to die solid than the excessive Silicon containing aluminium alloys.
A stress die casting in LM24 is appropriate for maximum engineering packages and has a bonus over an alloy such as LM6 while most mechanical residences are required. In exercise LM6 is favored to LM24 best for die casting wherein a excessive resistance to corrosion is the number one requirement. LM24 has terrible weldability and brazeability.
For the huge majority of die casting, the alloys LM2 and LM24 are similarly appropriate. A casting in LM24 isn't always commonly warmth treated.
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