Mechanical Properties Of Silicium-Aluminium Alloys

Mechanical Properties Of Silicium-Aluminium Alloys
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Aluminum alloys containing highly loaded silicon (Si/Al composite) are of special importance in terms of thermal management applications owing to their low density, high thermal conductivity and tailorable coefficient of thermal expansion (CTE). Besides the attractive physical properties, the strength and elastic modulus of Si is markedly higher than Al, so that highly loaded Si/Al composite may be effectively strengthened and has superior mechanical properties. This proposal is supported by the extensively accepted strengthening theory for particle reinforced Al matrix composites (AMCs). Besides, appropriate strength–toughness combinations will enable the structure–function integrated applications of this lightweight material.

Typically, high volume fraction Si/Al composite often contains 50–75 vol.% Si inclusions in manner of closely packed particles or semi-continuous network within Al matrix. In such kind of AMCs, the coordinated deformation of matrix and particle is difficult because of the intense constraint of reinforcement framework. As a result, these composites are brittle and their mechanical properties become highly sensitive to flaws, such as porosities, particle defects or abnormally coarsened Si particles. Most of the available investigations on Si/Al composites revealed poor mechanical properties and machinability. Particularly, strength of composites reinforced with more than 50% Si is often comparable or even lowered than the non-reinforced Al alloys, and further degrades with increasing Si content. In a word, the mechanical behaviors of this composite are highly dependent on the fabrication processing which now is not well controlled.AlSi(Silicon-Aluminum) alloy was produced by our proprietory rapid solidification process to reach isotropic and homogeneous microstructure with average grain size is within 40μm,high surface roughness and no macro-segregation,which greatly improve the performance.

Commonly Used Packaging Materials Performance Comparison:

MaterialDensity
g/cm³
CTE
25℃
ppm/ ℃
Thermal Conductivity  25℃ W/mkPlateabillityMachinabilityWeldabilityFormability
Copper8.916385GoodGoodGoodGood
Titanium4.58.917FairFairFairFair
Cast Al60612.723195GoodGoodGoodGood
Kovar8.4615GoodGoodGoodGood
Cu85%w16.46.8180FairFairFairFair
Cu85%Mo106.8165FairFairFairFair
Al65%SiC36.8170PoorPoorPoorPoor
Aluminum-graphite2.57.5/23190PoorGoodPoorGood
AlSi272.617175GoodGoodGoodGood
AlSi502.511.5140GoodGoodGoodGood
AlSi702.437.5120GoodGoodGoodGood


Controlled expansion Al-50Si alloy product showcase:


OFS--泵浦合束器_副本


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