Abstract
Al3Ti intermetallic compound with the tetragonal D022 structure undergoes a phase transformation to the high-symmetry L12 cubic structure by addition of third elements, Me. The lattice constants of some L12 modified (Al1−xMex)3Ti intermetallic compounds are closed to that of alpha aluminum. Therefore, it is expected that the addition of L12 modified (Al1−xMex)3Ti intermetallic compound particles show good grain refining performance of cast aluminum. In this paper, our recent results on novel refines containing heterogeneous nucleation site particles of L12 modified (Al1−xMex)3Ti intermetallic compounds have been reviewed.
Highlights
Equiaxed grain structure ensures uniform mechanical properties, reduced ingot cracking, improved feeding to eliminate shrinkage porosity, distribution of secondary phases and microporosity on a fine scale, improved machinability and cosmetic features
It is seen that reaction between the Al2.7Fe0.3Ti intermetallic compound and the aluminum matrix is not found at the interface, even though the refiners were fabricated by the sintering route
Different refining performance characteristics appeared for refiners with different phases, even though the chemical compositions of the refiners themselves were the same
Summary
Equiaxed grain structure ensures uniform mechanical properties, reduced ingot cracking, improved feeding to eliminate shrinkage porosity, distribution of secondary phases and microporosity on a fine scale, improved machinability and cosmetic features. The grain refining innoculants commonly used in the aluminium industry are usually master alloys of A1-Ti or A1-Ti-B [1]. Grain refinement of aluminum and its alloys by the addition of Al-Ti-B refiners to liquid melt prior to casting is a common practice in order to achieve a fine equiaxed grained microstructure in a casting which otherwise solidifies usually with coarse columnar grain structure [2]. It is well accepted that the effective heterogeneous nucleation site particles have better lattice matching with the solidified alpha aluminium (a = 0.4049 nm)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
