Microstructure and mechanical properties of B4C/2024Al functionally gradient composites. (March 2022)

• Record Type: Journal Article
• Authors: Chao, Z.L.; Wang, Z.W.; Jiang, L.T.; Chen, S.P.; Pang, B.J.; Zhang, R.W.; Du, S.Q.; Chen, G.Q.; Zhang, Q.; Wu, G.H.
• Is Part Of: Materials & design. Volume 215(2022)
• Publication Date: 2022-03
• Subjects: Metal-matrix composites (MMCs) -- Layered structures -- Precipitates -- Interface reaction -- Electron microscopy -- Mechanical properties; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2022.110449
• Languages: English
• ISSNs: 0264-1275

Abstract

Graphical abstract: Highlights: A kind of 70-47-25% B4 C/2024Al functionally graded materials with excellent and graded performance were prepared. The types, morphologies and the orientation relationships with Al matrix of precipitates in B4 C/2024Al FGMs were obviously different. The interfacial microstructure, precipitate characteristics and precipitation mechanism of B4 C/2024Al FGMs were revealed. Abstract: In this research, a kind of 70-47-25% B4 C/2024Al functionally graded materials (FGMs) were prepared by squeeze casting. The interfacial microstructure, precipitate characteristics and mechanical properties of B4 C/2024Al FGMs were mainly studied. It was found that there was a small amount of interfacial reaction between B4 C particles and Al. Mg and O elements segregated at the Al-B4 C interface and MgO was formed. Under the same heat treatment conditions, the types and sizes of precipitates in different gradient layers were found to be different. Different amount of Mg segregation at the B4 C-Al interface resulted in different proportion of Cu and Mg in 2024Al matrix and it makes the precipitation regions of 25 vol%, 47 vol% and 70 vol% B4 C/2024Al locate in S, θ + S and θ respectively. The test results of basic properties indicated that the strength and plasticity of 70-47-25% B4 C/2024Al FGMs show gradient changes. The bending stresses of 70%, 47% and 25% B4 C/2024Al composites can reach 591.5 MPa, 953.4 MPa and 700.7 MPa respectively. And the elastic modulus are 240.3 GPa, 170.9 GPa and 130.7 GPa respectively. The results of this research will provide theoretical guidance for the interface structure design and heat treatment process of high strength B4 C/Al composites.