Thermal conductivity of in-situ dual matrix aluminum composites with segregated morphology. (December 2021)

• Record Type: Journal Article
• Authors: Lakra, Suprabha; Bandyopadhyay, Tapas Kumar; Das, Siddhartha; Das, Karabi
• Is Part Of: Materials research bulletin. Volume 144(2021)
• Publication Date: 2021-12
• Subjects: Aluminum matrix composites -- Inhomogeneous microstructures -- Thermal conductivity -- In-situ dual matrix composites; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2021.111515
• Languages: English
• ISSNs: 0025-5408

Abstract

Highlights: The in-situ dual matrix composite has been fabricated from the three different systems, i.e., Al-TiO2, Al-ZrO2 and Al-TiO2 -B2 O3 via mechanical and thermal synthesis process. This unique microstructural concept of "composite within a composite" has been applied to enhance the thermal conductivity of the composite. The thermal conductivity of composites with segregated microstructure is found to be 2 to 5 times higher than that of with a homogeneous microstructure. Abstract: The dual matrix composites consisting of a reinforcement rich area (RRA) and reinforcement lean area (RLA) were fabricated incorporating in-situ process by powder metallurgy route. The RRA consists of milled Al-Al2 O3 -M (i.e., M is Al3 Ti, Al3 Zr or TiB2 ), and RLA consists of mostly pure unmilled Al. For comparison, composite with single matrix having equivalent content of uniformly distributed reinforcement was also fabricated. The microstructure and thermal conductivity of single and dual matrix composites were compared. The dual matrix composites with the segregated morphology have shown a 2-5 times increase in thermal conductivity than single matrix composite with an equivalent amount of uniformly dispersed reinforcements. Graphical abstract: