Xinxing Chemical and Metallurgical Materials Shenzhen Co.

Shenzhen, China

Xinxing Chemical and Metallurgical Materials Shenzhen Co.

Shenzhen, China

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Zhong F.,China Institute of Technology | Zhong F.,Central South University | Qi W.,China Institute of Technology | Wang S.,China Institute of Technology | And 3 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2014

The Al-Zr-B master alloys with different B/Zr mole ratios were prepared by the direct melt reaction method with Al, K2ZrF6 powder and KBF4 powder as raw materials. The influence of B/Zr ratio on the microstructure and grain refinement of Al-Zr-B master alloy was investigated by optical microscope (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the formation of the secondary phases in Al-Zr-B alloy firmly depended on the B/Zr mole ratio. The secondary phases were mainly composed of ZrAl3 which was coarse and massive, and ZrB2 particles which were easy to join together to form some particle clusters and distribute along the α(Al) grain boundary when the B/Zr mole ratio was about 1. The secondary phases were mainly composed of ZrB2 particles and a few ZrAl3 phases when the B/Zr mole ratio was about 2. All the secondary phases were ZrB2 particles when the B/Zr mole ratio was about 3. The refining experiment showed that the refining effect became better with the increase of B/Zr mole ratio, the Al-Zr-B master alloy with a B/Zr mole ratio of 3 had a desirable refining effect, which led the coarse dendrite to small equiaxial grains. After solid solution treatment on AZ91D alloy, the average grain sizes could be refined from 328 to 120 μm, and its tensile strength and elongation were 213 MPa and 4.95%, respectively, which were increased by 15.1% and 30.3% compared with the AZ91D alloy without addition of Al-Zr-B master alloy. The mechanism of grain refinement was ascribed to the ZrB2 particles acting as the heterogeneous nucleus of primary α-Mg phase.


Wang S.,China Institute of Technology | Zhong F.,China Institute of Technology | Zhong F.,Central South University | Qi W.,China Institute of Technology | And 2 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2014

The Al-5Zr-1B master alloy was fabricated by a situ reaction from Al melt and K2ZrF4+KBF4 powder. The microstructure of Al-5Zr-1B master alloy and its grain refining effect on pure Mg and AZ31 magnesium alloy were studied by OM, XRD and SEM. The results show that the Al-5Zr-1B master alloy has a lot of ZrB2 particles with average size 0.2 μm. The ZrB2 particles are effective nucleation cores of magnesium grains, resulting in the grains refinement of pure Mg and AZ31 magnesium alloy. With the increasing of the amount of Al-5Zr-1B alloy, the grain size of pure Mg and AZ31 magnesium alloy is decreased. When adding 0.3% Al-5Zr-1B master alloy, the average grain size of pure Mg is reduced from 1400 to 120 μm. When adding 0.6% Al-5Zr-1B master alloy, the average grain size of AZ31 magnesium alloy is reduced from 170 to 45 μm.


Qi W.,China Institute of Technology | Wang S.,China Institute of Technology | Chen X.,Xinxing Chemical and Metallurgical Materials Shenzhen Co. | Nong D.,China Institute of Technology | Zhou Z.,Xinxing Chemical and Metallurgical Materials Shenzhen Co.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2013

Al-5Ti-1B master alloy was a high efficient grain refiner of pure aluminum and aluminum alloy, which could significantly improve the processing performance of pure aluminum and aluminum alloy and the quality of aluminum products. However, the grain refinement mechanism of Al-5Ti-1B master alloy on the pure aluminum and aluminum alloy was not clear. In the present work, the pure Al was refined by adding Al-5Ti-1B, Al-10Ti, Al-4B master alloy and TiB2 powder, respectively. The effects of TiAl3, TiB2 and AlB2 phases on grain refinement of pure Al were compared. The effective nucleation phase and grain refinement mechanism of Al-5Ti-1B master alloy were investigated by optical microscope, X-ray diffraction, scanning electron microscope and transmission electron microscope. The results showed that the TiAl3 was an effective nucleation phase, but the TiAl3 in Al-5Ti-1B master alloy could not be nucleation phase due to dissolving in aluminum melt. The AlB2 and TiB2 could not be nucleation phase alone. However, the TiB2 could become an effective nucleation core when the TiB2 was coated with TiAl3. The grain refinement mechanism of Al-5Ti-1B master alloy on pure Al was as follows: some Ti atoms originating from TiAl3 melting reacted with Al melt to form TiAl3 phase as the nucleation core of grain. Remaining Ti atoms segregated on the TiB2 surface to form TiAl3 phase as the nucleation core of grain.

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