Statistical Approach on Microstructure and Hardness of Semi-Solid Cast ‎Aluminum Alloy A380 Produced by Mechanical Vibration in Argon Gas Atmosphere

Document Type : Original Research Article

Authors

1 Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr/Isfahan, Iran

2 Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University

10.22034/frj.2018.149185.1051

Abstract

Semi-solid processes are amongst the novel methods of producing materials. The first method of these processes is introduced around 30 years ago. These methods include forming of a semi-solid, semi-molten mixture which can be produced by using casting or mechanical forming techniques. The key point for using these fabrication processes is to create a non-dendrite structure in a semi-solid mixture. Some tools and devices have introduced in semi-solid casting until now for example cooling slopes, mechanical vibration device and melt mixers. These devices are usually used for the purpose of reducing the grain size and also increasing the mechanical properties of alloys. Also, some studies approved that using of the controlled atmosphere reduces the amount of impurities and porosities into the product. Therefore, in this paper, the effect of different conditions on A380 aluminum alloy is investigated using a mechanical vibrator that capable of controlling the atmospheric environment. In following, Taguchi statistical method was used to analyze the data and also reduce the number of experiments. The statistical results showed that the temperature parameter had the highest effect, equal to 64%, in this alloy. Also, the second level of this parameter, which is 625°C, was selected as the most appropriate level. Also, vibration frequency, with an effect of 32%, ranks the second position and vibration time with an effect of 3% is in the third place, which both perform best at their highest chosen level.

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References

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Founding Research Journal
Volume 2, Issue 4 - Serial Number 7
April 2019
Pages 275-286

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History

  • Receive Date: 18 September 2018
  • Revise Date: 03 December 2018
  • Accept Date: 23 December 2018

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