Investigation of Oxidation Behaviors of Al-Mg Alloys with a Grain Refiner at High Temperature

2021 ◽  
Vol 16 (7) ◽  
pp. 1129-1133
Author(s):  
Seong-Ho Ha ◽  
Abdul Wahid Shah ◽  
Bong-Hwan Kim ◽  
Young-Ok Yoon ◽  
Hyun-Kyu Lim ◽  
...  
Keyword(s):  
High Temperature ◽  
Cross Sections ◽  
Master Alloy ◽  
Mg Alloys ◽  
Ambient Atmosphere ◽  
Grain Refiner ◽  
Long Duration ◽  
The Matrix ◽  
Al Mg Alloys ◽  
Oxidation Behaviors

Studies to investigate the oxidation behavior of Al–Mg alloys with Al-5 mass%Ti-1 mass%B master alloy as a grain refiner at high temperature were conducted. The Scheil-Gulliver cooling calculation showed that, in 0.2 mass%Ti-inoculated alloy, TiAl3 was formed before the primary Al formation, which may act as a grain refiner. The optical microstructures showed a significant grain refinement after the addition of 0.2 mass%Ti using Al-5 mass%Ti-1 mass%B master alloy. Moreover, the oxidized cross-sections, throughout the oxidation time, show coarse and dark areas (regarded as oxide clusters), which were nonuniformly distributed in the matrix after oxidation at 500 °C under an ambient atmosphere. In addition, an accumulation of oxygen by diffusion for a long duration led to the growth of blisters after 50 h. At the oxidation temperature, Mg3Ti2Al18 was found to be only stable Ti-containing phase and possibly formed MgO by the interaction with the diffused oxygen.

Research on Synthesizing Process under Ultrasound Coupling and Refining Performance of Al-Ti-C Grain Refiner

2012 ◽  
Vol 217-219 ◽  
pp. 377-381 ◽  
Author(s):  
Ying Long Li ◽  
Fu Rong Cao ◽  
Li Jin
Keyword(s):  
High Temperature ◽  
Grain Refinement ◽  
Master Alloy ◽  
Reduction Method ◽  
High Energy ◽  
Experimental Results ◽  
Reaction Synthesis ◽  
Grain Refiner ◽  
Synthesis Mechanism ◽  
Refining Performance

The microstructural characters and refining property of Al-Ti-C grain refinement alloy prepared by ultrasound coupling method were studied by analytical means such as SEM, and the reaction synthesis mechanism of Al-Ti-C grain refinement was discussed. Experimental results show that the Al-Ti-C alloy refiner using “thermite reduction method” under high-energy ultrasound was prepared experimentally. Its microstructure character is that master alloy has smaller size of TiC, its quantities are larger and are dispersed. Melt reaction is generally that the source of titanium releases Ti atoms under high temperature of ultrasonic. Ti atoms react with aluminum to generate TiAl3, and react with carbon to generate TiC.

Effects of Constituent Phases on Oxidation Kinetics of Al–Mg Alloys Containing a Trace of Ca

2021 ◽  
Vol 21 (3) ◽  
pp. 2067-2070
Author(s):  
Chul-Hong Bae ◽  
Seong-Ho Ha ◽  
Bong-Hwan Kim ◽  
Young-Ok Yoon ◽  
Hyun-Kyu Lim ◽  
...  
Keyword(s):  
Oxygen Partial Pressure ◽  
Intermetallic Compounds ◽  
Master Alloy ◽  
Oxidation Kinetics ◽  
Thermodynamic Calculation ◽  
Mg Alloys ◽  
Initial Oxidation ◽  
Oxidation Rates ◽  
Kinetics Of ◽  
Al Mg Alloys

In this study, the effects of constituent phases on the oxidation kinetics of an Al-7 mass%Mg alloy containing a trace of Ca were investigated. A Mg+Al2Ca master alloy was used to add Mg and Ca simultaneously. Scheil-Gulliver cooling by thermodynamic calculation showed that the addition of Ca led to the formation of Ca-based intermetallic compounds, such as Al4Ca and Laves C36, after solidification. Based on weight increase indicated by the oxidation test and surface analysis, it was found that the presence of Ca-based phases significantly improved the oxidation resistance and slowed down the oxidation rates. Based on the review of phase diagrams with oxygen partial pressure by thermodynamic calculation, it was thought that in the initial oxidation, MgO and MgAl2O4 were formed on the surfaces of the Al–Mg alloys, leading to further oxidation. The Ca-based intermetallic compounds formed Ca–Mg–Al based oxides, which possibly contributed to the formation of a relatively dense oxide layer.

Behaviour of Al-Mg alloys at high temperature

1987 ◽  
Vol 22 (6) ◽  
pp. 1941-1944 ◽  
Author(s):  
Aruna Bahadur
Keyword(s):  
High Temperature ◽  
Mg Alloys ◽  
Al Mg Alloys

Effect of cyclic stress on the high temperature creep behavior of AlMg alloys

1993 ◽  
Vol 41 (3) ◽  
pp. 933-940 ◽  
Author(s):  
Zhi'an Yang ◽  
Zhirui Wang ◽  
Xiaobo Hu ◽  
Zhongguang Wang
Keyword(s):  
High Temperature ◽  
Creep Behavior ◽  
Cyclic Stress ◽  
Mg Alloys ◽  
High Temperature Creep ◽  
Temperature Creep ◽  
Al Mg Alloys

High-temperature oxidation of Al-Mg alloys

1990 ◽  
Vol 34 (3-4) ◽  
pp. 323-333 ◽  
Author(s):  
M. H. Zayan ◽  
O. M. Jamjoom ◽  
N. A. Razik
Keyword(s):  
High Temperature ◽  
High Temperature Oxidation ◽  
Mg Alloys ◽  
Temperature Oxidation ◽  
Al Mg Alloys

Effect of Mg Contents on Trapping Efficiency in Al-Mg System Using PAS

2007 ◽  
Vol 265 ◽  
pp. 7-11
Author(s):  
N.A. Kamel
Keyword(s):  
Cross Sections ◽  
Mg Alloys ◽  
Trapping Efficiency ◽  
Thickness Reduction ◽  
Doppler Broadening ◽  
Degree Of Deformation ◽  
S Parameter ◽  
Mean Lifetime ◽  
The Mean ◽  
Al Mg Alloys

PLT and the Doppler broadening S-parameter were used to characterize the Al-Mg alloys, AA5005, AA5051, AA5052 and AA5083. The trapping efficiencies of these alloys were estimated to be 2.42 x 109, 2.29 x 109, 2.24 x 109 and 2.27 x 109 s-1 cm3, respectively, and the corresponding trapping cross-sections were estimated to be 2.66 x 10-16, 2.14 x 10-16, 2.10 x 10-16 and 3.51 x 10-16 cm2. It was found to be very clear that the mean lifetime and S-parameter exhibited the same behaviour as a function of the degree of deformation, and that they saturated at the same degree of thickness reduction.

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