Interfacial microstructure and strengthening mechanism in Ti–6Al–4V reinforced Al-7075 alloy

Abstract

In the present study, an Al-7075 alloy reinforced with 15 wt-% TC4 (Ti–6Al–4V) was synthesised by hot pressing. The results of transmission electron microscopy suggest that a well-bonded multilayer interface was created, and that the multilayer has the ability to limit crack initiation at the interface. Sintering at 913 K for 0.5 h proved to be the most effective procedure for limiting the sources of cracking inside the multilayer interface, resulting in an enhanced tensile strength and a compressive strength for the composite of 454 and 873 MPa, respectively. The desired multilayer structure and the strengthening mechanism are discussed in detail. This structure provides guidance for the development of new methods for fabricating composites with excellent mechanical properties.

Strengthening mechanism of age-hardenable Al–xMg–3Zn alloys

“…The yield strength of aluminium alloys is affected by their microstructural properties such as grain/phase boundaries, solutes/vacancies, precipitates/dispersoids and dislocations, resulting in grain boundary strengthening, solid solution strengthening, precipitation/ dispersion strengthening and strain hardening, respectively [1][2][3]. When a dislocation approaches the grain boundary, its migration to another grain boundary is blocked due to the difference between the orientation of slip planes and the directions in two neighbouring grains.…”