Effect of ultrasonic treatment on the alloying and grain refinement efficiency of a Mg – Zr master alloy added to magnesium at hypo- and hyper-peritectic compositions

2019 ◽  
Vol 512 ◽  
pp. 20-32 ◽  
Author(s):  
B. Nagasivamuni ◽  
Gui Wang ◽  
David H. StJohn ◽  
Matthew S. Dargusch
Keyword(s):  
Grain Refinement ◽  
Master Alloy ◽  
Ultrasonic Treatment ◽  
Refinement Efficiency

scholarly journals The Interactions Between Oxide Film Inclusions and Inoculation Particles TiB2 in Aluminum Melt

2021 ◽  
Author(s):  
Jiawei Yang ◽  
Sarina Bao ◽  
Shahid Akhtar ◽  
Yanjun Li
Keyword(s):  
Grain Refinement ◽  
Master Alloy ◽  
Large Fraction ◽  
Oxide Films ◽  
Grain Refiner ◽  
Particle Sedimentation ◽  
Aluminum Melt ◽  
Refinement Efficiency ◽  
Long Time ◽  
Commercial Purity Aluminum

AbstractIn this work, a systematic study on the interactions between aluminum oxide films and TiB2 grain refiner particles and their effect on grain refinement behavior have been conducted. Oxide films were introduced into a commercial purity aluminum melt by adding AA 6061 alloy chips while the grain refiner particles were introduced by adding Al-3T-1B master alloy. Strong sedimentation of TiB2 grain refiner particles was observed in aluminum melt without chip addition during long-time settling. Most of the TiB2 particles were settled and accumulated at the bottom of crucible. In contrast, the sedimentation of TiB2 particles is much less in the melt with the addition of oxide films. A large fraction of TiB2 particles were found to be adhered to the oxide films located at the top part of the crucible, which inhibited the sedimentation of grain refiner particles. TP-1 type tests were also done to study the grain refinement efficiency of Al-3Ti-1B master alloy under different melt cleanliness and settling time. It is found that sedimentation of TiB2 particles greatly reduces the grain refinement efficiency. The introduction of oxide films seems to slightly alleviate the fading effect. This is owing to the strong adherence between the oxide films and TiB2 particles, which leads to a retardation of particle sedimentation.

scholarly journals Grain Refinement Of Al-Si Hypoeutectic Alloys By Al3Ti1B Master Alloy And Ultrasonic Treatment

2016 ◽  
pp. 141-150 ◽  
Author(s):  
Gui Wang ◽  
Eric Qiang Wang ◽  
Arvind Prasad ◽  
Matthew Dargusch ◽  
David H StJohn
Keyword(s):  
Grain Refinement ◽  
Master Alloy ◽  
Ultrasonic Treatment

scholarly journals Grain Refinement of Al-Si Hypoeutectic Alloys by Al3Ti1B Master Alloy and Ultrasonic Treatment

2016 ◽  
pp. 143-150 ◽  
Author(s):  
Gui Wang ◽  
Eric Qiang Wang ◽  
Arvind Prasad ◽  
Matthew Dargusch ◽  
David H StJohn
Keyword(s):  
Grain Refinement ◽  
Master Alloy ◽  
Ultrasonic Treatment

scholarly journals Grain Refinement of an Al-2 wt%Cu Alloy by Al3Ti1B Master Alloy and Ultrasonic Treatment

2016 ◽  
Vol 117 ◽  
pp. 012050 ◽  
Author(s):  
E Q Wang ◽  
G Wang ◽  
M S Dargusch ◽  
M Qian ◽  
D G Eskin ◽  
...  
Keyword(s):  
Grain Refinement ◽  
Master Alloy ◽  
Ultrasonic Treatment ◽  
Cu Alloy

scholarly journals Development of New Oxide Based Master Alloys and their Grain Refinement Potency in Aluminium Alloys

2015 ◽  
Vol 828-829 ◽  
pp. 23-28 ◽  
Author(s):  
Vadakke Madam Sreekumar ◽  
N. Hari Babu ◽  
Dmitry G. Eskin ◽  
Z. Fan
Keyword(s):  
Grain Size ◽  
Cooling Rate ◽  
Grain Refinement ◽  
Master Alloy ◽  
Aluminium Alloys ◽  
Al Alloys ◽  
Ultrasonic Cavitation ◽  
Size Reduction ◽  
Refinement Efficiency ◽  
Master Alloys

In this study, grain refinement efficiency of a new oxide master alloy based on MgAl2O4 was demonstrated in Al alloys. The grain size of the reference alloy was reduced by 50-60% with the addition of the master alloy and introduction of ultrasonic cavitation. While cooling rate has an influence on the grain size reduction, higher levels of addition of master alloy was found to be not effective in further reducing the grain size.

Preparation of Al-Ti-B-C Master Alloy and its Grain Refinement Effect for Pure Al

2012 ◽  
Vol 452-453 ◽  
pp. 778-781 ◽  
Author(s):  
Z.Q. Wang ◽  
H. Wu ◽  
Z.X. Yang ◽  
H.R. Geng
Keyword(s):  
Grain Refinement ◽  
Master Alloy ◽  
Molar Ratio ◽  
Refinement Efficiency ◽  
Master Alloys ◽  
The Matrix ◽  
Refinement Effect

In this paper, we successfully produced Al-Ti-B-C master alloys through adding mixtures of Ti and B4C powders into Al melt. XRD and SEM examinations suggest that only fine TiB2 and TiC particles are formed in the matrix of Al-Ti-B-C master alloy when the Ti/B4C molar ratio is 3/1, while an additional TiAl3 phase is present when the Ti/B4C molar ratio exceeds 3/1. The produced Al-Ti-B-C master alloys exhibited high grain refinement effect for pure Al. It was found that the presence of TiAl3 phase in the matrix of Al-Ti-B-C master alloy enhanced the grain refinement efficiency and the mechanism was discussed.

Influence of C/Ti stoichiometry in TiC x on the grain refinement efficiency of Al–Ti–C master alloy

2017 ◽  
Vol 33 (7) ◽  
pp. 616-622 ◽  
Author(s):  
Huabing Yang ◽  
Tong Gao ◽  
Haichao Wang ◽  
Jinfeng Nie ◽  
Xiangfa Liu
Keyword(s):  
Grain Refinement ◽  
Master Alloy ◽  
Refinement Efficiency

scholarly journals Grain Refinement Efficiency of a New Oxide-Containing Master Alloy for Aluminium Casting Alloys

2014 ◽  
Vol 794-796 ◽  
pp. 155-160 ◽  
Author(s):  
Vadakke Madam Sreekumar ◽  
Nadendla Hari Babu ◽  
Dmitry G. Eskin ◽  
Zhong Yun Fan
Keyword(s):  
Grain Size ◽  
Grain Refinement ◽  
Master Alloy ◽  
Ultrasonic Cavitation ◽  
A357 Alloy ◽  
Aluminium Casting ◽  
Casting Alloys ◽  
Refinement Efficiency

In this study, grain refinement efficiency of a new oxide master alloy based on MgAl2O4was demonstrated on an A357 alloy. The grain size of the reference alloy was reduced by 50-60% with the addition of the master alloy and introduction of ultrasonic cavitation. A higher addition of master alloy was found to be not benificial in further reducing the grain size.

The influence of gadolinium on Al–Ti–C master alloy and its refining effect on AZ31 magnesium alloy

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wenxue Fan ◽  
Hai Hao
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Grain Refinement ◽  
Magnesium Alloys ◽  
Master Alloy ◽  
Cast Alloy ◽  
Az31 Magnesium Alloy ◽  
Synthesis Mechanism ◽  
Refining Effect ◽  
Master Alloys

Abstract Grain refinement has a significant influence on the improvement of mechanical properties of magnesium alloys. In this study, a series of Al–Ti–C-xGd (x = 0, 1, 2, 3) master alloys as grain refiners were prepared by self-propagating high-temperature synthesis. The synthesis mechanism of the Al–Ti–C-xGd master alloy was analyzed. The effects of Al–Ti–C-xGd master alloys on the grain refinement and mechanical properties of AZ31 (Mg-3Al-1Zn-0.4Mn) magnesium alloys were investigated. The results show that the microstructure of the Al–Ti–C-xGd alloy contains α-Al, TiAl3, TiC and the core–shell structure TiAl3/Ti2Al20Gd. The refining effect of the prepared Al–Ti–C–Gd master alloy is obviously better than that of Al–Ti–C master alloy. The grain size of AZ31 magnesium alloy was reduced from 323 μm to 72 μm when adding 1 wt.% Al–Ti–C-2Gd master alloy. In the same condition, the ultimate tensile strength and elongation of as-cast alloy were increased from 130 MPa, 7.9% to 207 MPa, 16.6% respectively.

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