Grain Refinement of Zn-50Al Alloy through the Addition of Zn–Al-Ti-B-C Master Alloy and Melt Thermal-Rate Treatment

2012 ◽  
Vol 562-564 ◽  
pp. 238-241
Author(s):  
Z.Q Wang ◽  
D.L Yang ◽  
Z.X Yang ◽  
H.R Geng
Keyword(s):  
Grain Refinement ◽  
Master Alloy ◽  
Treatment Process ◽  
Step Method ◽  
Master Alloys ◽  
The Matrix ◽  
Tib2 Particles ◽  
Refinement Effect ◽  
Al Matrix

In this paper, two types of Zn-Al-Ti-B-C master alloys were produced by a two-step method and were found to have good refinement effect for Zn-50Al alloy. SEM results show that TiC and TiB2 particles act as the nucleating center of α-Al grains in Zn-50Al alloy. The presence of TiAl3-xZnx phase in the matrix of Zn-Al-Ti-B-C master alloy was found to further enhance the refinement effect. The melt thermal-rate treatment process present good grain refinement effect for Zn-50Al alloy and it was further promoted by the addition of Zn-Al-Ti-B-C master alloy into Zn-Al matrix.

Grain Refinement of Zn-50Al Alloy through the Addition of Zn-Al-Ti-C Master Alloy

2012 ◽  
Vol 452-453 ◽  
pp. 339-343 ◽  
Author(s):  
Z.Q. Wang ◽  
W.J. Li ◽  
Z.X. Yang ◽  
H.R. Geng ◽  
W.H. Wang ◽  
...  
Keyword(s):  
Grain Refinement ◽  
Master Alloy ◽  
Dendritic Growth ◽  
Al Alloy ◽  
Step Method ◽  
Solidification Temperature ◽  
Master Alloys ◽  
Melt Solidification ◽  
Refinement Effect ◽  
Al Matrix

In this paper, two types of Zn-Al-Ti-C master alloy with different Ti/C ratios were produced throug a two-step method, characterized by XRD and SEM, and their refinement behaviors and mechanism in Zn-50Al alloy were studied. Both of the master alloys remarkably reduced the size of α-Al grains, impeded the dendritic growth and promote the equiaxed growth of α-Al grains in Zn-50wt.%Al alloy. The master alloy containing both TiC and dditional Ti in the Zn-Al matrix was found to have higher refinement ability than that containg only TiC. The refinement effect of both master alloys was greatly enhanced as the solidification temperature of Zn-50Al melt decreases. TiC particles were observed to be located at the center of α-Al grains and act as the nucleating substrate for α-Al. The decrease of melt solidification temperature and the presence of additional Ti atoms in the Zn-50Al melt cause higher melt supercooling, which further elevate the nucleating rate of α-Al grains on TiC particles and promote the equiaxed growth of α-Al grains.

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.

Preparation of Al-Ti-N Master Alloy Grain Refiner for Al

2012 ◽  
Vol 452-453 ◽  
pp. 721-725
Author(s):  
Z.Q. Wang ◽  
C.J. Chen
Keyword(s):  
Grain Refinement ◽  
Powder Mixture ◽  
Master Alloy ◽  
Induction Furnace ◽  
Grain Refiner ◽  
Refinement Effect ◽  
Al Matrix

An Al-Ti-N master alloy was prepared through the addition of AlN and Ti powders into pure Al melt heated in an induction furnace. This master alloy shows a higher grain refinement effect for pure Al than Al-Ti due to the formation of TiN and/or AlxTiyNz particles in the Al matrix. DTA, SEM and XRD results suggest that TiN and/or AlxTiyNz particles start to form at about 970°C during heating the Al-Ti-AlN powder mixture.

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.

Influence of Reaction Temperature for the Manufacturing of Al-3Ti and Al-3B Master Alloys and their Grain Refining Efficiency on a Al-7Si Alloy

2007 ◽  
Vol 29-30 ◽  
pp. 111-115 ◽  
Author(s):  
S.A. Kori ◽  
V. Auradi
Keyword(s):  
Size Distribution ◽  
Grain Refinement ◽  
Reaction Temperature ◽  
Master Alloy ◽  
Induction Furnace ◽  
Grain Refining ◽  
Refining Efficiency ◽  
Master Alloys ◽  
Halide Salts ◽  
Titanium Fluoride

In the present work binary Al-3Ti and Al-3B master alloys were prepared at different reaction temperatures in an induction furnace by the reaction of halide salts like potassium fluoborate and potassium titanium fluoride with liquid molten Al. The indigenously developed master alloys were used for grain refinement studies of Al-7Si alloy and evaluated for their grain refining ability by CACCA studies. The present results suggest that, the reaction temperature influences the size, size distribution and morphology of the intermetallic (Al3Ti in Al-3Ti, and AlB2/AlB12 in Al-3B) particles present in Al-3Ti and Al-3B master alloys. Grain refinement studies of Al-7Si alloy reveal that, Al-3Ti and Al-3B master alloys prepared at 8000C-60 min. have shown better grain refining efficiency on Al- 7Si alloy when compared to the master alloys prepared at 9000C-60 min and 10000C-60 min respectively. In addition, B-rich Al-3B master alloy shows efficient grain refinement than Ti rich Al- 3Ti master alloy.

Mechanical Properties and Wear Behavior of Aluminum Grain Refined by Ti and Ti+B

2019 ◽  
Vol 7 (1) ◽  
pp. 1-19
Author(s):  
Ahmad Omar Mostafa
Keyword(s):  
Tensile Properties ◽  
Grain Refinement ◽  
Wear Behavior ◽  
Industrial Process ◽  
Solid Solution Hardening ◽  
Coarse Grained ◽  
Wear Behaviour ◽  
Pull Out ◽  
Master Alloys ◽  
Tib2 Particles

Grain refinement, by adding master alloys, is an important industrial process for aluminum casting operations. In this work, microstructure, microhardness, tensile properties, surface roughness and wear behavior of Al and both Al-0.15Ti and Al-0.05Ti-0.01B microalloys were investigated. The addition of Ti and B to pure Al reduced the grain size by 83%. The grain refinement effect was due to the presence of Al3Ti and TiB2 particles, which activated the columnar-to-equiaxed transition and improved both microhardness and tensile properties. The presence of both Al3Ti and TiB2 particles was confirmed using thermodynamic calculations. Average microhardness values increased form 39 HV for pure Al to 95 and 76 HV for Al-Ti and Al-Ti-B microalloys, respectively, by solid solution hardening. The enhanced wear behaviour of Al was due to the coarse-grained structure where the plastic deformation mechanism took place. Whereas, grain pull-out dominated the wear behavior of fine-grained specimens. It was concluded that the material with a smooth surface has high friction coefficient and low wear rate.

scholarly journals Effect of Eutectic Mg2Si Phase Modification on the Mechanical Properties of Al-8Zn-6Si-4Mg-2Cu Cast Alloy

Metals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 32 ◽  
Author(s):  
Byung Joo Kim ◽  
Sung Su Jung ◽  
Ji Hoon Hwang ◽  
Yong Ho Park ◽  
Young Cheol Lee
Keyword(s):  
Mechanical Properties ◽  
Master Alloy ◽  
Base Alloy ◽  
Cast Alloy ◽  
Energy Dispersive Spectrometer ◽  
Chinese Script ◽  
Phase Modification ◽  
Master Alloys ◽  
Polygonal Shape ◽  
Tib2 Particles

The modification effect of Al-5Ti-1B master alloy on eutectic Mg2Si in Al-Zn-Si-Mg system alloy was investigated in this study. The microstructure shows that an extreme effect can be achieved after the addition of Al-5Ti-1B master alloy into the base alloy. The morphology of eutectic Mg2Si changed from Chinese script to fine polygonal shape, and the size was refined from over 50 μm to under 10 μm. This morphology change is believed to be due to TiB2 particles existing in Al-5Ti-1B master alloy, and the presence of TiB2 particles inside the modified Mg2Si was confirmed by scanning electron microscope/energy dispersive spectrometer (SEM/EDS) observation. The mechanical properties were also improved by the addition of Al-5Ti-1B master alloys. This study investigated the reason for the improvement in mechanical properties with the modification of the microstructure.

Temperature Effect of Refining Performance by Al-Ti-B (C) Master Alloys

2011 ◽  
Vol 306-307 ◽  
pp. 475-480
Author(s):  
Cong Juan Gao ◽  
Hai Min Ding ◽  
Xiang Fa Liu
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Temperature Effect ◽  
Master Alloy ◽  
Experimental Results ◽  
Refining Effect ◽  
Master Alloys ◽  
Refining Performance ◽  
Tib2 Particles ◽  
Performance And Mechanism

Refining performance and mechanism of Al-5Ti-1B and Al-5Ti-0.4C master alloys at different temperature were investigated in this paper. The experimental results show that the refining effect of Al-5Ti-0.4C master alloy becomes worse as temperature increasing from 750°C to 1200°C, The refining effect of Al-5Ti-1B master alloy becomes worse as temperature increasing from 750°C to 1000°C. However, when the temperature is above 1000°C, the refining effect of Al-5Ti-1B master alloy recovers gradually as temperature increasing. TiB2 particles with TiAl3 layers are the heterogeneous nucleating cores of α-Al at low temperature. However, TiB2 particles are the heterogeneous nuclei of α-Al at high temperature.

scholarly journals Effects of modifying the hypoeutectic AlMg5Si2Mn alloy via addition of Al10Sr and/or Al5TiB

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
P. Snopiński ◽  
M. Król ◽  
T. Wróbel ◽  
K. Matus ◽  
A. Woźniak ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Grain Refinement ◽  
Spectroscopic Characterization ◽  
Nucleation Temperature ◽  
Alloy Sample ◽  
Nucleation Sites ◽  
Master Alloys ◽  
Ti Particles ◽  
Prepared Alloy ◽  
Refinement Effect

AbstractThis work demonstrates that the combined addition of Al10Sr and Al5TiB master alloys to the AlMg5Si2Mn effectively refines the grain microstructure and partially modifies the eutectic Mg2Si phase. Thorough spectroscopic characterization reveals that the grain refinement effect is due to Al3Ti particles acting as nucleation sites for α-Al grains, and the increased nucleation temperature of α-Al is due to Al10Sr addition. It is also determined that TiB2 particles can act as nucleation substrates for the primary Mg2Si phase. The prepared alloy sample with the finest microstructure (treated with both Al10Sr and Al5TiB) exhibits the greatest corrosion resistance among all tested samples.

Microstructure of Al-4.99Zr-1.1B Master Alloy and Its Grain Refinement Effect on AZ31 Magnesium Alloy

2014 ◽  
Vol 43 (11) ◽  
pp. 2567-2571 ◽  
Author(s):  
Wang Shuncheng ◽  
Gan Chunlei ◽  
Li Xiaohui ◽  
Zheng Kaihong ◽  
Qi Wenjun
Keyword(s):  
Magnesium Alloy ◽  
Grain Refinement ◽  
Master Alloy ◽  
Az31 Magnesium Alloy ◽  
Refinement Effect
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