The formation of AlB2 in an Al–B master alloy

Wang, Xiaoming

doi:10.1016/j.jallcom.2005.04.204

Cited by 106 publications

(62 citation statements)

References 16 publications

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“…As shown in Figure 4(b) there are no clear AlB 2 peaks being resolved, an indication of minor amount of AlB 2 in this master alloy. The heat accumulation owing to highly exothermic salt reaction could be responsible for formation of AlB 12 during the production of Al-5B master alloy [14]. Figure 5 shows SEM image of the Al-5B master alloy and the EDS spectrum of the observed boride particles.…”

Section: Boron Inmentioning

confidence: 99%

Effect of Al Addition on Microstructure of AZ91D

Joshi¹,

Babu²

2014

Magnesium Technology 2014

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Casting is a net shape or near net shape forming process so workhardening will not be applicable for improving properties of magnesium cast alloys. Grain refinement, solid-solution strengthening, precipitation hardening and specially designed heat treatment are the techniques used to enhance the properties of these alloys. This research focusses on grain refinement of magnesium alloy AZ91D, which is a widely used commercial cast alloy. Recently, Al-B based master alloys have shown potential in grain refining AZ91D. A comparative study of the grain refinement of AZ91D by addition of 0.02wt%B, 0.04wt%B, 0.1wt%B, 0.5wt%B and 1.0wt%B of Al-5B master alloy and equivalent amount of solute element aluminium is described in this paper. Hardness profile of AZ91D alloyed with boron and aluminium is compared.

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Section: Boron Inmentioning

confidence: 99%

Effect of Al Addition on Microstructure of AZ91D

Joshi¹,

Babu²

2014

Magnesium Technology 2014

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“…In the first stage the chemical reactions are suggested as follows [13] : 12KBF 4 +13Al→AlB 12 +12KAlF 4 (5) As shown in the Al-B binary phase diagram (Fig.5), when the boron content is less than 44.5 wt% AlB 12 will be stable over 975 ℃.While AlB 2 can exist stably at lower temperature. When the system temperature is less than 975 ℃ a peritectic reaction will take place: L+AlB 12 →AlB 2 ( ≤975 ℃) (6) Compared the thermodynamic parameters of generating AlB 2 (Furmula 3) and AlB 12 (Furmula 6), it is concluded that the free energy change of Reaction (3) is lower than that of Reaction (6) [14] .It means that the generation of AlB 2 is easier than that of AlB 12 , AlB 2 will be the only stable phase. But its presence at lower concentration has been reported [15] .…”

Section: Kinetics Analysis Of In Situ Reactionmentioning

confidence: 99%

Mechanism and kinetic model of in-situ TiB2/7055Al nanocomposites synthesized under high intensity ultrasonic field

Chen

Zhao

et al. 2011

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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In-situ TiB 2 /7055Al nanocomposites are fabricated by in situ melt chemical reaction from 7055Al-K 2 TiF 6 -KBF 4 system under high intensity ultrasonic fi eld, and the mechanism and kinetic model of insitu melt chemical reaction are investigated. X-ray diffraction (XRD) and scanning electron microscope (SEM) analyses indicate that the sizes of in-situ TiB 2 nanoparticles are in the range of 80-120 nm. The results of icewater quenched samples show that the whole process contains four stages, and the overall in-situ reaction time is 10 minutes. The in situ synthesis process is controlled mainly by chemical reaction in earlier stage (former 3 minutes), and by the particulate diffusing in later stage. The mechanism of key reaction between Al 3 Ti and AlB 2 under high intensity ultrasonic in the 7055Al-K 2 TiF 6 -KBF 4 system is the reaction-diffusion-crack-rediffusion. Furthermore, the reactive kinetic models in 7055Al-K 2 TiF 6 -KBF 4 system are established.

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“…This master alloy contains B, AlB2 and AlB12 particulates. AlB12 can be unstable depending on the B content of the melt; and reacts with Al to form AlB2 which is a peritectic reaction [11,12].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Mechanism of Pore Formation in Directionally Solidified A356 Alloy

Uludağ

Dışpınar

2017

Archives of Foundry Engineering

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It is well-known that the better the control of the liquid aluminium allows obtaining of better properties. One of the most important defects that is held responsible for lower properties has been the presence of porosity. Porosity has always been associated with the amount of dissolved hydrogen in the liquid. However, it was shown that hydrogen was not the major source but only a contributor the porosity. The most important defect that causes porosity is the presence of bifilms. These defects are surface entrained mainly due to turbulence and uncontrolled melt transfer. In this work, a cylindrical mould was designed (Ø30 x 300 mm) both from sand and die. Moulds were produced both from sand and die. Water cooled copper chill was placed at the bottom of the mould in order to generate a directional solidification. After the melt was prepared, prior to casting of the DC cast samples, reduced pressure test sample was taken to measure the melt quality (i.e. bifilm index). The cast parts were then sectioned into regions and longitudinal and transverse areas were investigated metallographically. Pore size, shape and distribution was measured by image analysis. The formation of porosity was evaluated by means of bifilm content, size and distribution in A356 alloy.

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The formation of AlB2 in an Al–B master alloy

Cited by 106 publications

References 16 publications

Effect of Al Addition on Microstructure of AZ91D

Effect of Al Addition on Microstructure of AZ91D

Mechanism and kinetic model of in-situ TiB2/7055Al nanocomposites synthesized under high intensity ultrasonic field

Assessment of Mechanism of Pore Formation in Directionally Solidified A356 Alloy

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