scholarly journals Investigation the solidification of Al-4.8 wt.%Cu alloy at different cooling rate by computer-aided cooling curve analysis

2014 ◽  
Vol 20 (2) ◽  
pp. 107-118 ◽  
Author(s):  
Mehdi Dehnavi ◽  
Hosein Vafaeenezhad ◽  
Mohsen Haddad Sabzevar
Keyword(s):  
Cooling Rate ◽  
Alloy Composition ◽  
Data Acquisition System ◽  
Structural Features ◽  
Curve Analysis ◽  
Cooling Curve ◽  
Cooling Curves ◽  
Cu Alloy ◽  
Cooling Curve Analysis ◽  
Computer Aided

Depending on the casting conditions and alloy composition, microstructure and properties of the aluminium alloys will be different. There are many techniques available for investigating the solidification of metals and alloys. In recent years computer-aided cooling curve analysis (CA-CCA) has been used to determine thermophysical properties of alloys, latent heat and solid fraction. The aim of this study was to investigate the effect of cooling rate on the structural features of Al-4.8 wt.%Cu alloy by thermal analysis of cooling curves. To do this, Al-4.8 wt.%Cu alloy was melted and solidified applying 0.04, 0.42, and 1.08 °C/sec cooling rates. The temperature of the samples was recorded using a K thermocouple and a data acquisition system connected to a PC. It was found that the formation temperatures of various thermal parameters such as (liquidus, solidus and eutectic temperatures) are shifting by increasing of cooling rate from 0.04 °C/sec to 1.08 °C/sec. The structural results show that grain size and secondary dendrite arm spacing decreased by increasing of cooling rate. 

Modification Effects of Sb on Al7SiMg Alloy Measured with Cooling Curve Analysis

2016 ◽  
Vol 879 ◽  
pp. 2113-2118 ◽  
Author(s):  
Shu Sen Wu ◽  
Meng Jie Lü ◽  
Jian Xun Chen ◽  
You Wu Mao ◽  
Shu Lin Lü
Keyword(s):  
Thermal Analysis ◽  
Growth Temperature ◽  
Curve Analysis ◽  
Cooling Curve ◽  
Eutectic Solidification ◽  
Microstructure Observation ◽  
Modification Effect ◽  
Cooling Curve Analysis ◽  
Computer Aided ◽  
Eutectic Si

The modification mechanism of Sb on eutectic Si phase of Al-Si alloys was not understood very well. In this paper the modification effects of Sb on Al7SiMg alloy were investigated by computer aided cooling curve thermal analysis coupled with microstructure observation. The results show that the addition of Sb with 0.1%~0.25% amount has refining effect on eutectic Si phase, and this modification effect can be recorded by the cooling curve. The addition of Sb decreases the growth temperature of the eutectic solidification (TEG) by 5.0 °C to 7.8 °C, and this indicates that there is an undercooling effect with Sb modification. Moreover, faster cooling rate can obtain more superior morphology of eutectic Si, which can be changed from short rod to nearly granular particles. The morphology of eutectic Si is nearly unchanged with holding time extending from 0.5h to 2.5h, which means Sb has long modification effect for Al-Si alloys.

scholarly journals Grain size control in al-4.8 wt.% Cu alloy by computeraided cooling curve analysis

2014 ◽  
Vol 20 (3) ◽  
pp. 183-190
Author(s):  
Mehdi Dehnavi ◽  
Mohsen Haddad Sabzevar
Keyword(s):  
Grain Size ◽  
Grain Refinement ◽  
Size Control ◽  
Curve Analysis ◽  
Cooling Curve ◽  
Cu Alloy ◽  
Master Alloys ◽  
Cooling Curve Analysis ◽  
Grain Size Control ◽  
Casting Industry

Generally Al–Ti and Al–Ti–B master alloys are added to the aluminium alloys for grain refinement. The cooling curve analysis (CCA) has been used extensively in metal casting industry to predict microstructure constituents, grain refinement and to calculate the latent heat of solidification. The aim of this study was to investigate the effect of grain refinement on the grain size of Al-4.8 wt.%Cu alloy by cooling curve analysis. To do this, alloy was grain refined by different amount of Al-5Ti-1B master alloy and all samples were solidified at constant cooling rate of 0.19 ℃/s. The temperature of the samples was recorded using a K thermocouple and a data acquisition system connected to a PC. The results show that the segregating power of Ti is very high and it segregates to the nucleant–liquid interface which leads to constitutional supercooling within which other nucleant particles get activated for nucleation. Other results show that with considering the changes in the primary undercooling (ΔTRU) as the main factor to determine the effectiveness of grain refinement process, it was found that by grain refinement, the value of undercooling decrease was approximately zero. 

scholarly journals Cooling curve analysis in binary Al-Cu alloys: Part II- Effect of Cooling Rate and Grain Refinement on The Thermal and Thermodynamic Characteristics

10.30544/81 ◽  
2015 ◽  
Vol 21 (3) ◽  
pp. 207-222 ◽  
Author(s):  
Mehdi Dehnavi ◽  
Mohsen Haddad-Sabzevar ◽  
Mohamad Hasan Avazkonnadeh-Gharavol
Keyword(s):  
Cooling Rate ◽  
Grain Refinement ◽  
Latent Heat ◽  
Thermodynamic Characteristics ◽  
Curve Analysis ◽  
Cooling Curve ◽  
Cu Alloys ◽  
Master Alloys ◽  
Cooling Curve Analysis ◽  
Casting Industry

The Al-Cu alloys have been widely used in aerospace, automobile, and airplane applications. Generally Al–Ti and Al–Ti–B master alloys are added to the aluminium alloys for grain refinement. The cooling curve analysis (CCA) has been used extensively in metal casting industry to predict microstructure constituents, grain refinement and to calculate the latent heat of solidification. The aim of this study is to investigate the effect of cooling rate and grain refinement on the thermal and thermodynamic characteristics of Al-Cu alloys by cooling curve analysis. To do this, Al-Cu alloys containing 3.7, and 4.8 wt.% Cu were melted and solidified with 0.04, 0.19, 0.42, and 1.08 K/s cooling rates. The temperature of the samples was recorded using a K thermocouple and a data acquisition system connected to a PC. Some samples were Grain refined by Al-5Ti-1B to see the effect of grain refinement on the aforementioned properties. The results show that, in a well refined alloy, nucleation will occur in a shorter time, and a undercooling approximately decreases to zero. The other results show that, with considering the cooling rate being around 0.1 °C/s, the Newtonian method is efficient in calculating the latent heat of solidification.

scholarly journals Cooling curve analysis in binary Al-Cu alloys: Part I- Effect of cooling rate and copper content on the eutectic formation

10.30544/80 ◽  
2015 ◽  
Vol 21 (3) ◽  
pp. 195-206 ◽  
Author(s):  
M. Dehnavi ◽  
F. Kuhestani ◽  
M. Haddad-Sabzevar
Keyword(s):  
Cooling Rate ◽  
Latent Heat ◽  
Copper Content ◽  
Time Derivative ◽  
Weight Percent ◽  
Curve Analysis ◽  
Cooling Curve ◽  
Copper Addition ◽  
Cooling Curve Analysis ◽  
First Time

There are many techniques available for investigating the solidification of metals and alloys. In recent years computer-aided cooling curve analysis (CA-CCA) has been used to determine thermo-physical properties of alloys, latent heat and solid fraction. In this study, the effect of cooling rate and copper addition was taken into consideration in non- equilibrium eutectic transformation of binary Al- Cu melt via cooling curve analysis. For this purpose, melts with different copper weight percent of 2.2, 3.7 and 4.8 were prepared and cooled in controlled rates of 0.04 and 0.42 °C/s. Results show that, latent heat of alloy highly depends upon the post- solidification cooling rate and composition. As copper content of alloy and cooling rate increase, achieved nonequilibrium eutectic phase increases that leads to release of high amount of latent heat and appearing of second deviation in cooling curve. This deviation can be seen in first time derivative curve in the form of a definite peak.

Computer aided cooling curve analysis (CACCA) of ADC-12 alloy

2021 ◽  
Author(s):  
Athul V. Anil ◽  
Vijeesh Vijayan ◽  
B. Sachin ◽  
Prithvi Kumar Rai ◽  
Muralidhara Rao
Keyword(s):  
Curve Analysis ◽  
Cooling Curve ◽  
Cooling Curve Analysis ◽  
Computer Aided
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