Effect of the Al–Zr–Y master alloy composition on the modifying effect in the Al–4% Cu alloy

2016 ◽  
Vol 2016 (2) ◽  
pp. 167-169 ◽  
Author(s):  
E. A. Popova ◽  
P. V. Kotenkov
Keyword(s):  
Master Alloy ◽  
Alloy Composition ◽  
Cu Alloy ◽  
Modifying Effect

Influence of Annealing of Al-5Ti-1B Master Alloy on Hot Tearing of Cast Al-7Si-3Cu Alloy

2017 ◽  
Vol 737 ◽  
pp. 27-31 ◽  
Author(s):  
Sachin Kumar Rathi ◽  
Ashok Sharma ◽  
Marisa di Sabatino
Keyword(s):  
Master Alloy ◽  
Annealing Temperature ◽  
Alloy Composition ◽  
Thin Liquid Film ◽  
Xrd Analysis ◽  
Hot Tearing ◽  
Cu Alloy ◽  
Characterization Study ◽  
Die Cast ◽  
Phase Characterization

Hot tearing is a common and severe defect encountered in aluminium alloys castings. It is affected by alloy composition as well as processing conditions and variables. In Al–7Si-3Cu presence of copper increases mechanical properties of the alloy, but it makes the alloy susceptible to hot tearing. The observations on the microstructures and the fracture surfaces propose that the hot tearing initiated at the grain boundaries and propagated along them through the thin liquid film. Grain refinement limits the hot tearing tendency of the Al-Si-Cu alloy. An attempt has been made to record the effect of annealed Al-5Ti-1B master alloy on minimizing hot tearing tendency in the gravity die cast of Al-7Si-3Cu alloys. It is observed that grain refining efficiency of Al-5Ti-1B master alloy is increased with increase in annealing temperature. This is attributed to the increased fraction of TiAl3 particles and the possible formation of (Ti,Al)B2 phase. Characterization study has been carried out by OM, SEM and XRD analysis.

scholarly journals The Mechanical Properties of AlSi17Cu5 Cast Alloy after Overheating and Modification of CuP Master Alloy

2013 ◽  
Vol 13 (3) ◽  
pp. 68-71
Author(s):  
J. Piątkowski ◽  
M. Jabłońska
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperature ◽  
Master Alloy ◽  
Liquid State ◽  
Alloy Composition ◽  
Cast Alloy ◽  
Primary Silicon ◽  
Grain Structure ◽  
Silicon Crystals ◽  
Fine Grain

Abstract The paper presents the results of studies on the effect of the AlSi17Cu5 alloy overheating to atemperature of 920°C and modification with phosphorus (CuP10) on the resultingmechanical (HB, Rm, R0.2) and plastic (A5 and Z) properties. It has been shown that, so-called, "timethermal treatment" (TTT) of an alloy in the liquid state, consisting inoverheating the metal to about 250°C above Tliq,holding at this temperature by 30 minutes improvesthe mechanical properties. It has also been found that overheating of alloy above Tliq.enhances the process of modification, resulting in the formation of fine-grain structure. The primary silicon crystals uniformly distributed in the eutectic and characteristics ofthe α(Al) solution supersaturated with alloying elements present in the starting alloy composition (Cu, Fe) provide not only an increase of strength at ambient temperature but also at elevated temperature (250°C).

Effect of Casting Condition on Density and Hardness Gradients of Al-Al2Cu Alloy FGM Fabricated by Centrifugal In Situ Method

2009 ◽  
Vol 631-632 ◽  
pp. 449-454 ◽  
Author(s):  
Kenichi Tabushi ◽  
Hisashi Sato ◽  
Yoshimi Watanabe
Keyword(s):  
Density Gradient ◽  
Master Alloy ◽  
Early Stage ◽  
Functionally Graded ◽  
Processing Temperature ◽  
Casting Condition ◽  
Cu Alloy ◽  
In Situ Method ◽  
Master Alloys

Functionally graded material (FGM) is a combined material that has a component gradient from one material at one surface to another material at the opposite surface. 　As one of the fabrication processes of FGM, centrifugal in-situ method has been proposed. Centrifugal in-situ method is a casting that centrifugal force is applied during solidification to both the primary crystal and the matrix. In a previous study, the density and hardness gradients of Al-3mass%Cu FGM ring fabricated by centrifugal in-situ method have been investigated. According to the study, Cu concentration within the FGM ring monolithically increases towards the ring's inner position, and its density also increases toward inner region. This is because the density of the primary -Al crystal is larger than that of the molten Al-Cu alloy in the early stage of solidification. Based on this solidification process, it is considered that the casting condition and the initial Cu concentration of Al-Cu master alloy affect on the density and hardness gradients in the Al-Cu FGM ring. In this study, effects of the casting condition on the density and hardness gradients of Al-Al2Cu FGM rings fabricated by the centrifugal in-situ method were investigated. It was found that density gradient of the Al-Al2Cu FGM rings increases with increasing Cu concentration of Al-Cu master alloys. Also, processing temperature for Al-Cu master alloy can control density gradient of Al-Al2Cu FGM rings. These phenomena were explained by variation of the densities of primary -Al and the molten Al matrix during the solidification.

Modifying Effect of Al-Ti-C-P Master Alloy on Hypereutectic Al-Si Alloy

2007 ◽  
pp. 947-952
Author(s):  
Chun Xiang Xu ◽  
Li Ping Liang ◽  
Bin Feng Lu ◽  
Yong Jun Xue ◽  
Jin Shan Zhang ◽  
...  
Keyword(s):  
Master Alloy ◽  
Modifying Effect

scholarly journals Preparation of a Master Fe–Cu Alloy by Smelting of a Cu-Bearing Direct Reduction Iron Powder

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 701
Author(s):  
Liaoting Pan ◽  
Deqing Zhu ◽  
Zhengqi Guo ◽  
Jian Pan
Keyword(s):  
Iron Powder ◽  
Master Alloy ◽  
Theoretical Calculations ◽  
Direct Reduction ◽  
Sulfide Capacity ◽  
Copper Slag ◽  
Smelting Process ◽  
Cu Alloy ◽  
Direct Reduction Iron ◽  
And Diffusion

Generally, the Cu-bearing direct reduction iron powder (CBDRI) obtained from a direct reduction-magnetic separation process of waste copper slag contains a high content of impurities and cannot be directly used to produce Cu-bearing special steel. In this paper, further smelting treatment of CBDRI was conducted to remove its impurities (such as S, SiO2, Al2O3, CaO and MgO) and acquire a high-quality Fe–Cu master alloy. The results show that the Fe–Cu master alloy, assaying 95.9% Fe, 1.4% Cu and minor impurities, can be obtained from the smelting process at 1550 °C for 40 min with 1.0 basicity. Meanwhile, the corresponding iron and copper recoveries are 98.6% and 97.2%, respectively. Theoretical calculations and experimental results show that appropriate basicity (0.9~1.1) is beneficial for the recovery of Fe and Cu from a thermodynamic viewpoint due to the excellent fluidity of the slag in this basicity range. Moreover, the mechanism of desulfurization was revealed by calculating the sulfide capacity and the desulfurization reaction kinetics. Increasing the binary basicity of the slag benefits both the sulfide capacity and diffusion coefficient of the sulfur in the molten slag, resulting in higher desulfurization efficiency and lower S content in the master alloy.

Microstructure Evolution of Directionally Solidified Al-Cu Alloys

2010 ◽  
Vol 146-147 ◽  
pp. 729-733
Author(s):  
Min Qu ◽  
Lin Liu ◽  
Ming Zhao ◽  
Feng Bin Liu ◽  
Guang Ping He
Keyword(s):  
Temperature Gradient ◽  
Microstructure Evolution ◽  
Alloy Composition ◽  
Directionally Solidified ◽  
Cu Alloy ◽  
Cu Alloys ◽  
Higher Temperature ◽  
Mixed Microstructure ◽  
Dilute Alloy ◽  
Peculiar Phenomenon

The microstructure evolution of Al-Cu alloys with different compositions is investigated in directional solidification. Two distinctly different microstructure evolution mechanisms are obtained in Al-0.85%Cu and Al-4%Cu systems, respectively. In Al-0.85%Cu alloy, it shows a peculiar phenomenon, the microstructure evolution is always cells and no dendrites are obtained. In other words, the cells undergo several transitions as the pulling velocity increasing from 15μm/s to 300μm/s, they follow the sequences: mixed microstructure of pox and banded cells →mixed microstructure of polygonal and banded cells →banded cells →elongated cells. Particularly, it is studied what caused the dendrites not appear in Al-0.85%Cu system. Finally, it comes to the conclusion that there are two aspects which lead to the phenomenon: a dilute alloy composition and a relatively higher temperature gradient.

Sign in / Sign up

Export Citation Format

Share Document