EFFECT OF COOLING RATE AND GRAIN REFINEMENT ON THE MICROSEGREGATION IN Al-4.8 wt.% Cu ALLOY
Microsegregation is one of the most important phenomena occurs during solidification. It usually results in formation of some unexpected second phases which generally affect the mechanical properties and specially reduce the workability of casting products. The aim of this research is to study the e...
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doaj-c316a9b018c3422584ca8a8bee1af0562020-11-24T21:24:41ZengIran University of Science & TechnologyIranian Journal of Materials Science and Engineering1735-08082383-38822015-12-011246270EFFECT OF COOLING RATE AND GRAIN REFINEMENT ON THE MICROSEGREGATION IN Al-4.8 wt.% Cu ALLOYM. Dehnavi0M. Haddad-Sabzevar1M.H. Avazkonandeh-Gharavol2H. Vafaeenezhad3 1- Department of Materials Engineering and Metallurgy, Ferdowsi University of Mashhad, Mashhad, Iran 1- Department of Materials Engineering and Metallurgy, Ferdowsi University of Mashhad, Mashhad, Iran 1- Department of Materials Engineering and Metallurgy, Ferdowsi University of Mashhad, Mashhad, Iran School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran Microsegregation is one of the most important phenomena occurs during solidification. It usually results in formation of some unexpected second phases which generally affect the mechanical properties and specially reduce the workability of casting products. The aim of this research is to study the effect of cooling rate and grain refinement on the microsegregation in Al-4.8 wt.% Cu. For this purpose two series of experiments were designed. In the first set of experiments, the alloy was melted and cooled in three different rates, i.e. 0.04, 0.42, and 1.08 K/s in a DTA furnace. In the second series of experiments, the effect of grain refinement on the microsegregation at a constant cooling rate of 0.19 K/s was investigated. Al-5Ti-1B master alloy was used as grain refiner. Results showed that by increasing the cooling rate the amount of non-equilibrium eutectic phase increases from 5.1 to 7.4 wt.%, and the minimum concentration of solute element in primary phase decreases from 1.51 to 1.05 wt.% Cu. By grain refinement of the alloy, the amount of non-equilibrium eutectic phase decreases from 5.5 to 4.7 wt.%, and the minimum concentration of solute element in the primary phase increases from 0.98 to 1.07 wt.% Cu. So it is concluded that increasing cooling rate in the range of 0.04 to 1.08 K/s, increases and grain refinement reduces the microsegregationhttp://ijmse.iust.ac.ir/browse.php?a_code=A-10-988-1&slc_lang=en&sid=1Cooling rate Microsegregation α+Al2Cu eutectic Al-Ti-B master alloy. |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
M. Dehnavi M. Haddad-Sabzevar M.H. Avazkonandeh-Gharavol H. Vafaeenezhad |
spellingShingle |
M. Dehnavi M. Haddad-Sabzevar M.H. Avazkonandeh-Gharavol H. Vafaeenezhad EFFECT OF COOLING RATE AND GRAIN REFINEMENT ON THE MICROSEGREGATION IN Al-4.8 wt.% Cu ALLOY Iranian Journal of Materials Science and Engineering Cooling rate Microsegregation α+Al2Cu eutectic Al-Ti-B master alloy. |
author_facet |
M. Dehnavi M. Haddad-Sabzevar M.H. Avazkonandeh-Gharavol H. Vafaeenezhad |
author_sort |
M. Dehnavi |
title |
EFFECT OF COOLING RATE AND GRAIN REFINEMENT ON THE MICROSEGREGATION IN Al-4.8 wt.% Cu ALLOY |
title_short |
EFFECT OF COOLING RATE AND GRAIN REFINEMENT ON THE MICROSEGREGATION IN Al-4.8 wt.% Cu ALLOY |
title_full |
EFFECT OF COOLING RATE AND GRAIN REFINEMENT ON THE MICROSEGREGATION IN Al-4.8 wt.% Cu ALLOY |
title_fullStr |
EFFECT OF COOLING RATE AND GRAIN REFINEMENT ON THE MICROSEGREGATION IN Al-4.8 wt.% Cu ALLOY |
title_full_unstemmed |
EFFECT OF COOLING RATE AND GRAIN REFINEMENT ON THE MICROSEGREGATION IN Al-4.8 wt.% Cu ALLOY |
title_sort |
effect of cooling rate and grain refinement on the microsegregation in al-4.8 wt.% cu alloy |
publisher |
Iran University of Science & Technology |
series |
Iranian Journal of Materials Science and Engineering |
issn |
1735-0808 2383-3882 |
publishDate |
2015-12-01 |
description |
Microsegregation is one of the most important phenomena occurs during solidification. It usually results in formation of some unexpected second phases which generally affect the mechanical properties and specially reduce the workability of casting products. The aim of this research is to study the effect of cooling rate and grain refinement on the microsegregation in Al-4.8 wt.% Cu. For this purpose two series of experiments were designed. In the first set of experiments, the alloy was melted and cooled in three different rates, i.e. 0.04, 0.42, and 1.08 K/s in a DTA furnace. In the second series of experiments, the effect of grain refinement on the microsegregation at a constant cooling rate of 0.19 K/s was investigated. Al-5Ti-1B master alloy was used as grain refiner. Results showed that by increasing the cooling rate the amount of non-equilibrium eutectic phase increases from 5.1 to 7.4 wt.%, and the minimum concentration of solute element in primary phase decreases from 1.51 to 1.05 wt.% Cu. By grain refinement of the alloy, the amount of non-equilibrium eutectic phase decreases from 5.5 to 4.7 wt.%, and the minimum concentration of solute element in the primary phase increases from 0.98 to 1.07 wt.% Cu. So it is concluded that increasing cooling rate in the range of 0.04 to 1.08 K/s, increases and grain refinement reduces the microsegregation |
topic |
Cooling rate Microsegregation α+Al2Cu eutectic Al-Ti-B master alloy. |
url |
http://ijmse.iust.ac.ir/browse.php?a_code=A-10-988-1&slc_lang=en&sid=1 |
work_keys_str_mv |
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