Effect of Deformation on the Microstructure and Hardness of A356 Aluminum Alloy during SIMA Process

Publish Year: 1391
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:

IIAC02_075

تاریخ نمایه سازی: 12 اردیبهشت 1392

Abstract:

The SIMA (Strain Induced Melt Activated) process is a simple process to produce globular microstructure in aluminum alloys. This paper presents the influence of deformation on the globularization of α-Al in A356 aluminum alloy by SIMA process. The alloy was modified with Al-10%Sr and cast in permanent mold. Samples were cut and rolled with the amount of 5%, 10%, 15%, and 20% reduction at 300OC. The samples were heat treated at 590ºC for various holding time to spherodize the microstructure. The results showed that, the grains became smaller, spherical shape and having a homogenous distribution by increasing the deformation ratio. The globular grains grew with increasing holding time. In this investigation; the optimum condition was obtained in the samples were 20% warm rolled and heat treated for 15 minutes at the semi-solid temperature. The results indicated that the hardness and resistance to the deformation decreased through semi-solid heat treatment in SIMA process. Therefore, the necessary force for the deformation of the alloy has significantly been decreased.

Authors

M. Amne Elahi

M.Sc. Student Center of Excellence for High Strength Alloys Technology (CEHSAT),School of Metallurgy and Materials Engineering

H. Gheisari

M.Sc. Student Center of Excellence for High Strength Alloys Technology (CEHSAT),School of Metallurgy and Materials Engineering

S.G. Shabestari

Professor Center of Excellence for High Strength Alloys Technology (CEHSAT), School of Metallurgy and Materials Engineering

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