Formation Mechanisms and Microstructure Characterization of Al/Al3Ni In-situ Composite by Compound Casting

• Published in: Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2019-12, Vol.50 (6), p.3020-3026
• Main Authors: Sistaninia, M., Doostmohammadi, H., Raiszadeh, R.
• Format: Article
• Language: English
• Subjects: Aluminum; Bimetal composites; Bimetals; Binary alloys; Characterization and Evaluation of Materials; Chemistry and Materials Science; Formation mechanism; Indium compounds; Intermetallic layer; Intermetallic phases; Intermetallic phasis; Intermetallics; Materials Science; Mechanisms of formation; Metallic Materials; Microstructure; Microstructure characterization; Nanotechnology; Nickel; Particulate composites; Reinforcing particles; Solidification; Solidification process; Structural Materials; Surfaces and Interfaces; Ternary alloys; Thin Films
• ISSN: 1073-5615; 1543-1916; 1543-1916
• DOI: 10.1007/s11663-019-01682-1

The Compound casting method was used to produce an Al/Ni bimetal composite. The mechanisms of formation of the reinforcing intermetallic phases were studied and the produced bimetal composite’s microstructure was then characterized. The results showed that the Al/Ni interface consisted of two intermetallic layers including Al 3 Ni 2 and Al 3 Ni. It is suggested that the Al 3 Ni reinforcing particles of the composite originated from two sources. (1) Some Al 3 Ni particles detached from the Al 3 Ni layer formed at the interface between the Ni core and the Al melt and dispersed in the liquid Al and (2) Al-Al 3 Ni eutectic phase, which formed during the solidification process. The increase in the temperature led to the formation of more reinforcing particles and extended the depth of dispersion of the particles in the Al matrix.