Fabrication of grain refiners with a high volume fraction of Al_2.7Fe_0.3Ti heterogeneous nucleation site particles by spark plasma sintering

Abstract

In our previous study, a novel Al-L12-type Al2.7Fe0.3Ti refiner was fabricated by spark plasma sintering (SPS) and its refining performance was studied. It is found that L12-type Al2.7Fe0.3Ti particles can be favorable heterogeneous nucleation sites for Al casts, since the lattice matching between Al2.7Fe0.3Ti and Al is good. If the volume fraction of Al2.7Fe0.3Ti heterogeneous nucleation site particles in the refiner is increased, the same amount of heterogeneous nucleation site particles can be added even if the addition amount of the grain refiner is decreased. Therefore, it can contribute to the reduction of the cost of the refiners. In this paper, Al-Al2.7Fe0.3Ti refiners with a high volume fraction of Al2.7Fe0.3Ti heterogeneous nucleation site particles are fabricated by SPS and the effect on refining performance is investigated.

Review, Role of L12 Modified (Al1−xMex)3Ti Intermetallic Compounds on Heterogeneous Nucleation of Alpha Aluminum Grains

“…Therefore, it is expected that these intermetallic compounds show good grain refining performance. In our studies [13][14][15][16][17]…”

“…In eq. 3 Ti intermetallic compounds and directly prepared by gas atomization, were used [13][14][15][16][17]. Hereafter, the particles prepared by the crushing of an arc melted bulk sample and prepared by the gas atomization will be denoted as "crushed particles" and "gas-atomized particles", respectively.…”

Microstructure and Strength of Ti-6Al-4V Samples Additively Manufactured with TiC Heterogeneous Nucleation Site Particles

“…The chemical composition of the Ti-6Al-4V powder is listed in Table 2. Mixing of the powders was performed with a 3D motion mixer (Turbula shaker mixer) for 1 h. The container motion during mixing consisted of two rotations of the container around its longitudinal axis and horizontal translation to achieve uniform mixing of the particles [29,30]. The volume fraction of TiC particles in the mixed powder was fixed to 0.3 vol%.…”

Thermal Stability of L12‐Modified Al2.5Cu0.5Ti Particles in Al Matrix

“…The thermal stability of the heterogeneous nucleation site affects the grain refining performance. [8,11] The spark plasma sintering (SPS) method is a well-known technique for powder sintering, where SPS simultaneously applies pulsed current and uniaxial pressure to the punches of the mold system loaded with the mixture of powders to be sintered. The SPS has several unique and specific features.…”

“…The thermal stability of the heterogeneous nucleation site affects the grain refining performance. [ 8,11 ]…”