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Effect of superheating temperatures on microstructure and properties of strontium modified aluminium–silicon eutectic alloy

Superheating temperature on strontium modification of Al–Si alloy has tremendous effect on its solidification characteristics, which determines the structural refinement and hence the properties of the alloy. In this study, it is observed that as the superheating temperature is increased up to an op...

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Main Authors: Haque, Md. Mohafizul, Ismail, Ahmad Faris
Format: Article
Language:English
Published: Elsevier 2005
Subjects:
TA401 Materials of engineering and construction
Online Access:http://irep.iium.edu.my/36811/1/Materials_Processing_Tech.pdf
http://irep.iium.edu.my/36811/
http://www.sciencedirect.com/science/article/pii/S0924013605000890
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spelling my.iium.irep.368112017-06-14T03:40:30Z http://irep.iium.edu.my/36811/ Effect of superheating temperatures on microstructure and properties of strontium modified aluminium–silicon eutectic alloy Haque, Md. Mohafizul Ismail, Ahmad Faris TA401 Materials of engineering and construction Superheating temperature on strontium modification of Al–Si alloy has tremendous effect on its solidification characteristics, which determines the structural refinement and hence the properties of the alloy. In this study, it is observed that as the superheating temperature is increased up to an optimum temperature of 750 °C, the eutectic silicon becomes more globular and well distributed all over the entire structure. At the same time, the iron rich β needles become thinner and thinner as superheating temperature is increased. The embrittling effect of iron rich phase in the modified alloy also reduces, when it is present in the structure as fine and thin needle. The fractured surfaces show that the strontium modification minimizes the source of stress concentration regions in the cast samples. The melts, superheated to 730 and 740 °C, showed some white regions in the fractured surfaces, but when superheated to 750 °C, the fractured surfaces were free from such accumulation of white phases. The SEM analysis showed that the concentration of strontium on those white regions was more than any other areas of the fractured surfaces. It is believed that some undissolved strontium may appear in those white regions of the cast specimens, especially when melted at low superheating temperatures. At the superheating temperature of 750 °C, all phases were refined and well distributed throughout the entire structure, resulting a higher strength and ductility. Therefore, 750 °C is considered to be the optimum superheating temperature for the purpose of modification of aluminium–silicon eutectic alloy with strontium. Elsevier 2005 Article REM application/pdf en http://irep.iium.edu.my/36811/1/Materials_Processing_Tech.pdf Haque, Md. Mohafizul and Ismail, Ahmad Faris (2005) Effect of superheating temperatures on microstructure and properties of strontium modified aluminium–silicon eutectic alloy. Journal of Materials Processing Technology, 162/3. pp. 312-316. ISSN 0924-0136 http://www.sciencedirect.com/science/article/pii/S0924013605000890 10.1016/j.jmatprotec.2005.02.049
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
topic TA401 Materials of engineering and construction
spellingShingle TA401 Materials of engineering and construction
Haque, Md. Mohafizul
Ismail, Ahmad Faris
Effect of superheating temperatures on microstructure and properties of strontium modified aluminium–silicon eutectic alloy
description Superheating temperature on strontium modification of Al–Si alloy has tremendous effect on its solidification characteristics, which determines the structural refinement and hence the properties of the alloy. In this study, it is observed that as the superheating temperature is increased up to an optimum temperature of 750 °C, the eutectic silicon becomes more globular and well distributed all over the entire structure. At the same time, the iron rich β needles become thinner and thinner as superheating temperature is increased. The embrittling effect of iron rich phase in the modified alloy also reduces, when it is present in the structure as fine and thin needle. The fractured surfaces show that the strontium modification minimizes the source of stress concentration regions in the cast samples. The melts, superheated to 730 and 740 °C, showed some white regions in the fractured surfaces, but when superheated to 750 °C, the fractured surfaces were free from such accumulation of white phases. The SEM analysis showed that the concentration of strontium on those white regions was more than any other areas of the fractured surfaces. It is believed that some undissolved strontium may appear in those white regions of the cast specimens, especially when melted at low superheating temperatures. At the superheating temperature of 750 °C, all phases were refined and well distributed throughout the entire structure, resulting a higher strength and ductility. Therefore, 750 °C is considered to be the optimum superheating temperature for the purpose of modification of aluminium–silicon eutectic alloy with strontium.
format Article
author Haque, Md. Mohafizul
Ismail, Ahmad Faris
author_facet Haque, Md. Mohafizul
Ismail, Ahmad Faris
author_sort Haque, Md. Mohafizul
title Effect of superheating temperatures on microstructure and properties of strontium modified aluminium–silicon eutectic alloy
title_short Effect of superheating temperatures on microstructure and properties of strontium modified aluminium–silicon eutectic alloy
title_full Effect of superheating temperatures on microstructure and properties of strontium modified aluminium–silicon eutectic alloy
title_fullStr Effect of superheating temperatures on microstructure and properties of strontium modified aluminium–silicon eutectic alloy
title_full_unstemmed Effect of superheating temperatures on microstructure and properties of strontium modified aluminium–silicon eutectic alloy
title_sort effect of superheating temperatures on microstructure and properties of strontium modified aluminium–silicon eutectic alloy
publisher Elsevier
publishDate 2005
url http://irep.iium.edu.my/36811/1/Materials_Processing_Tech.pdf
http://irep.iium.edu.my/36811/
http://www.sciencedirect.com/science/article/pii/S0924013605000890
_version_ 1643611072209354752
score 13.211869

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