Heterogeneous nucleation of α-Al primary crystal on L12 modified Al2.7Ni0.3Ti phase. (28th November 2017)

• Record Type: Journal Article
• Authors: Watanabe, Yoshimi; Maekawa, Kazunori; Sato, Hisashi
• Is Part Of: Japanese journal of applied physics. Volume 57:Number 1(2018)Supplement 1
• Publication Date: 2017-11-28
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.57.01AF08
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: The heterogeneous nucleation of α-Al primary crystal on the L12 modified Al2.7 Ni0.3 Ti (Al67 Ni8 Ti25 ) phase was investigated. To study the effectiveness of heterogeneous nucleation by the L12 modified Al2.7 Ni0.3 Ti phase, an Al–10 vol % Al2.7 Ni0.3 Ti refiner was fabricated by spark plasma sintering (SPS). It was found that the maximum grain refinement performance can be achieved by the Al–10 vol % Al2.7 Ni0.3 Ti refiner after a holding time of 690 s. The mechanical properties of pure Al casts were improved by using the Al–10 vol % Al2.7 Ni0.3 Ti refiner through grain refinement. However, the grain refinement performance is relatively weaker than expected. This is because the Al–10 vol % Al2.7 Ni0.3 Ti refiner does not have a high thermal stability.