Formation of L12 modified Al2.5Cu0.5Ti phase by heat treatment of spark-plasma-sintered Cu/Al3Ti specimens. (14th November 2017)

• Record Type: Journal Article
• Authors: Watanabe, Yoshimi; Hirata, Kazuaki; Sato, Hisashi
• Is Part Of: Japanese journal of applied physics. Volume 57:Number 1(2018)Supplement 1
• Publication Date: 2017-11-14
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.57.01AF04
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: In our previous studies, the influence of L12 modified Al2.5 Cu0.5 Ti and Al2.7 Fe0.3 Ti particles on the grain refining performance of an Al cast was studied. It has been shown that the L12 modified intermetallic compound particles act as heterogeneous nucleation sites of α-Al solidification. Since nuclei are formed on the surface of the heterogeneous nucleation site particles, only the surface region of the Al3 Ti particles must be modified into an L12 structure. In this study, therefore, the formation of the Al2.5 Cu0.5 Ti phase by the reaction between Al3 Ti and Cu is studied. For this purpose, Cu/Al3 Ti diffusion couple specimens and specimens of Al3 Ti particles dispersed in a Cu matrix are fabricated by a spark plasma sintering (SPS) method, and the reaction between Cu and Al3 Ti during heat treatment of these specimens is studied. It is found that the L12 modified Al2.5 Cu0.5 Ti phase is formed at the Cu/Al3 Ti interface by heat treatment.