Synergic Improvement of Plasticity and Strength of Al-Zn-Mg-Cu Alloy by Grain Refinement and Precipitates Redistribution using Cyclic Extrusion Compression

2018 ◽  
Vol 20 (8) ◽  
pp. 1800140
Author(s):  
Ke-Min Xue ◽  
Mei Liu ◽  
Si-Liang Yan ◽  
Zhe Wang ◽  
Ya-Ling Hua ◽  
...  
Keyword(s):  
Grain Refinement ◽  
Cu Alloy ◽  
Cyclic Extrusion Compression

Severe plastic deformation of Al-1%Cu Alloy processed by a Simple Cyclic Extrusion Compression technique

2018 ◽  
Vol 1 (1) ◽  
pp. 77-90
Author(s):  
Walaa Abdelaziem ◽  
Atef Hamada ◽  
Mohsen A. Hassan
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Deformation Behavior ◽  
Cast Alloy ◽  
Surface Hardness ◽  
Grain Structure ◽  
Compression Technique ◽  
Cu Alloy ◽  
Cyclic Extrusion Compression

Severe plastic deformation is an effective method for improving the mechanical properties of metallic alloys through promoting the grain structure. In the present work, simple cyclic extrusion compression technique (SCEC) has been developed for producing a fine structure of cast Al-1 wt. % Cu alloy and consequently enhancing the mechanical properties of the studied alloy. It was found that the grain structure was significantly reduced from 1500 µm to 100 µm after two passes of cyclic extrusion. The ultimate tensile strength and elongation to failure of the as-cast alloy were 110 MPa and 12 %, respectively. However, the corresponding mechanical properties of the two pass CEC deformed alloy are 275 MPa and 35%, respectively. These findings ensure that a significant improvement in the grain structure has been achieved. Also, cyclic extrusion deformation increased the surface hardness of the alloy by 49 % after two passes. FE-simulation model was adopted to simulate the deformation behavior of the material during the cyclic extrusion process using DEFORMTM-3D Ver11.0. The FE-results revealed that SCEC technique was able to impose severe plastic strains with the number of passes. The model was able to predict the damage, punch load, back pressure, and deformation behavior.

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

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

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
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