Evolution of Thermo-mechanical Properties of Aluminium-Silicon Alloy (Al-1wt%Si)

Nursabah Sarikavakli

doi:10.11648/j.ajmsp.20170205.12

Nursabah Sarikavakli

Open Access

https://doi.org/10.11648/j.ajmsp.20170205.12

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Abstract

In the present article, an attempt has been made for the study of thermo-mechanical properties of alloy sample (Al-1 wt%Si). The effect of this we find good results on the microstructure and hardness of our samples with an addition of 1-3 wt.% (Al-Si). The analyses by transmission electron microscopy (TEM) show that aging heat treatment promotes micro-structural changes in morphology, size, and spatial distribution of precipitates.

Highlights

The Aluminium-Silicon (Al-Si) alloys [1,2,3] are frequently utilized to play an important role in the automotive industry, due its excellent combination of strength and ductility; of their high strength/weight ratio, corrosion resistance, excellent thermal conductivity and high cast ability allows the casting of complex forms.The 3XX alloy, an Al-Si-Cu system, is commonly used in engine blocks and cylinder heads normally with a T6 heat treatment to improve mechanical properties
Time and temperature, are two important variables to control during solution heat treatment (SHT) as they are responsible for Si modification and dissolution of Cu and Mg enriched phases
The nucleation of the precipitate of Si was enhanced by pre-ageing quenched specimens near the room temperature as a result of the existence of the dislocation loops formed by the condensation of the quenched alloy in vacancies [9]

Summary

Introduction

The Aluminium-Silicon (Al-Si) alloys [1,2,3] are frequently utilized to play an important role in the automotive industry, due its excellent combination of strength and ductility; of their high strength/weight ratio, corrosion resistance, excellent thermal conductivity and high cast ability allows the casting of complex forms.The 3XX alloy, an Al-Si-Cu system, is commonly used in engine blocks and cylinder heads normally with a T6 heat treatment to improve mechanical properties. Some transition metals like Ni and Fe, and some rare earths like Ce, which the main characteristic is their low solubility in Al e.g. maximum of 0.01% to 0.04%, are employed in Al-Cu and Al-Si alloys to improve strength and hardness at elevated temperature [4,5,6,7]. This is correlated mainly to impact its coefficient of thermal expansion. Both the strength and ductility of the alloy were functions of the size and distribution of the Si particles in the aluminium matrix [11]

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