scholarly journals Grain Refinement in Al-Si-Cu Alloy During Cyclic Extrusion

2012 ◽  
Vol 62 ◽  
pp. 775-778 ◽  
Author(s):  
Virgil Geamăn ◽  
Irinel Radomir ◽  
Maria Stoicănescu ◽  
Ioan Popa
Keyword(s):  
Grain Refinement ◽  
Cu Alloy

scholarly journals Partial Grain Refinement in Al-3%Cu Alloy during ECAP at Elevated Temperatures

2009 ◽  
Vol 50 (1) ◽  
pp. 101-110 ◽  
Author(s):  
Inna Mazurina ◽  
Taku Sakai ◽  
Hiromi Miura ◽  
Oleg Sitdikov ◽  
Rustam Kaibyshev
Keyword(s):  
Grain Refinement ◽  
Elevated Temperatures ◽  
Cu Alloy

Mechanism of grain refinement of an Al–Zn–Mg–Cu alloy prepared by low-frequency electromagnetic casting

2012 ◽  
Vol 47 (14) ◽  
pp. 5501-5508 ◽  
Author(s):  
Yubo Zuo ◽  
Jianzhong Cui ◽  
Zhihao Zhao ◽  
Haitao Zhang ◽  
Lei Li ◽  
...  
Keyword(s):  
Grain Refinement ◽  
Low Frequency ◽  
Cu Alloy ◽  
Electromagnetic Casting

Constitutive Equation for Thermal Strain in the Mushy Zone during Solidification of Aluminium Alloys

2006 ◽  
Vol 508 ◽  
pp. 343-348 ◽  
Author(s):  
Aage Stangeland ◽  
Asbjørn Mo ◽  
Dmitry G. Eskin
Keyword(s):  
Constitutive Equation ◽  
Mushy Zone ◽  
Grain Refinement ◽  
Constitutive Relation ◽  
Aluminium Alloys ◽  
Thermal Strain ◽  
Thermal Contraction ◽  
Cast Sample ◽  
Cu Alloy ◽  
Solid Part

A constitutive equation for thermal strain in the mushy zone has recently been established [1]. The parameters in this constitutive relation are in the present study determined for the commercial alloys A356, AA2024, AA6061 and AA7075 in addition to an Al-4 wt% Cu alloy by combining experimentally measured contraction of a cast sample with thermomechanical simulations. The constitutive equation for thermal strain in the mushy zone reflects that there is no thermal strain in the solid part of the mushy zone at low solid fractions and that the thermal strain in the mushy zone approaches thermal contraction in fully solid as the solid fraction increases towards one. Experiments were performed at cooling rates in the range from 2 to 5.5 °C/s. The solid fractions when the tested alloys start to contract, gsth, are in the range from 0.63 to 0.94. Grain refinement increases gsthfor all the tested 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. 

Equal Channel Angular Pressing (ECAP) and Its Application to Grain Refinement of Al-Zn-Mg-Cu Alloy

2011 ◽  
Author(s):  
Süleyman Tekeli ◽  
Ahmet Güral ◽  
Ferry Iskandar ◽  
Mikrajuddin Abdullah
Keyword(s):  
Grain Refinement ◽  
Equal Channel Angular Pressing ◽  
Angular Pressing ◽  
Cu Alloy

Grain refinement through arc manipulation techniques in Al–Cu alloy GTA welds

2005 ◽  
Vol 404 (1-2) ◽  
pp. 227-234 ◽  
Author(s):  
S.R. Koteswara Rao ◽  
G. Madhusudhana Reddy ◽  
M. Kamaraj ◽  
K. Prasad Rao
Keyword(s):  
Grain Refinement ◽  
Cu Alloy
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