Unveiling the Semicoherent Interface with Definite Orientation Relationships between Reinforcements and Matrix in Novel Al₃BC/Al Composites

Abstract

High-strength lightweight Al-based composites are promising materials for a wide range of applications. To provide high performance, a strong bonding interface for effective load transfer from the matrix to the reinforcement is essential. In this work, the novel AlBC reinforced Al composites have been in situ fabricated through a liquid-solid reaction method and the bonding interface between AlBC and Al matrix has been unveiled. The HRTEM characterizations on the AlBC/Al interface verify it to be a semicoherent bonding structure with definite orientation relationships: (0001)//(11̅1);[112̅0]//[011]. Periodic arrays of geometrical misfit dislocations are also observed along the interface at each (0001) plane or every five (11̅1) planes. This kind of interface between the reinforcement and the matrix is strong enough for effective load transfer, which would lead to the evidently improved strength and stiffness of the introduced new AlBC/Al composites.

Particle-reinforced metal matrix nanocomposites fabricated by selective laser melting: A state of the art review

“…Loading bearing effect is negligible for both particle size. This is contradictory to the argument that the interfacial bonding effects between matrix and particles enhance strength of the composites [78,161]. Although the effect of interface is highly valued, their effect in numerical estimation shows insignificance compared with other mechanisms while taking no consideration of defects.…”

Assessment of AlN/Mg–8Al Composites Reinforced with In Situ and/or Ex Situ AlN Particles

“…In other words, the particle chains may act as barriers for the movement of dislocations and cracks during the shearing procedure. The strengthening performance of either in situ or ex situ AlN particles on Mg-8Al matrix alloy can be attributed to several mechanisms, e.g., grain boundary strengthening, dislocation strengthening and load bearing mechanism, as can be seen in other PMMCs [23]. In particular, the 8.2AlNin/Mg-8Al composite has additional advantages over the 8.2AlN(in+ex)/Mg-8Al and 8.2AlNex/Mg-8Al composites, due to the special distribution of its AlN particles (Figure 4).…”

“…As mentioned above, some micron pores still exist in the prepared composites which are quite sensitive to the tensile test procedure. Therefore, to evaluate the mechanical The streamlined microstructure of these AlN/Mg-Al composites is the typical behavior of PMMCs, which is composed of a particle-rich zone and a particle-poor zone [22,23]. The formation mechanism is related to the powder mixing process, as well as the relative low sintering temperature (550 °C in this paper).…”

HRTEM study of interfacial structure in SiCp/A390 composites

“…It is a kind of very favorable crystallographic orientation relationship in terms of the structure of crystallography. It indicates that the interface between SiC and Al matrix has a lower energy, as well as the interface between SiC particles and the Al matrix combine closely [15]. Figure 4(a) shows an interfacial HRTEM image between SiC and Si.…”