Preparation of Al-Ti-B grain refiner by SHS technology[Self-propagating High-temperature Synthesis]

Journal Article · Tue Feb 01 04:00:00 EST 2000 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(99)00390-5· OSTI ID:20023181

Nikitin, V I; Wanqi, J I.E.; Kandalova, E G; Makarenko, A G; Yong, L

Since the discovery of the grain refinement effect of aluminum by titanium, especially with the existence of B or C in 1950, grain refiners are widely accepted in industry for microstructure control of aluminum alloys. Research on this topic is to obtain the highest grain refinement efficiency with the lowest possible addition of master alloy. It is widely accepted that the morphology and size of TiAl{sub 3} particles, which are known as heterogeneous nucleation centers, are important factors deterring the grain refinement efficiency. Fine TiAl{sub 3} particles are favorable. The grain refinement process shows a heredity phenomenon, which means that structural information from initial materials transfers through a melt to the final product. It is important to find the connection between microstructural parameters of the master alloy and the final product. To improve the quality of Al-Ti-B master alloys for the use as a grain refiner, a new method based on SHS (self-propagating high-temperature synthesis) technology has been developed in Samara State Technical University to produce the master alloys. SHS, as a new method for preparation of materials, was first utilized by Merzhanov in 1967. This method uses the energy from highly exothermic reactions to sustain the chemical reaction in a combustion wave. The advantages of SHS include simplicity, low energy requirement, and higher product purity. Because SHS reactions can take place between elemental reactants, it is easy to control product composition. The purposes of this investigation were to fabricate an SHS Al-5%Ti-1%B master alloy, to analyze its structure and to test its grain refining performance.

• Research Organization: Samara State Technical Univ. (RU)
• OSTI ID: 20023181
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 6 Vol. 42; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
BORON ALLOYS
CHEMICAL REACTIONS
GRAIN REFINEMENT
MICROSCOPY
NUCLEATION
SYNTHESIS
TITANIUM ALLOYS