Al-Based Nanocomposites Produced via Spark Plasma Sintering: Effect of Processing Route and Reinforcing Phases

Progress of Flake Powder Metallurgy Research

“…The PM route for MMCs production comprises the following main steps: powder processing and consequent powder consolidation. Metal powders are blended with reinforcements by means of techniques such as conventional FPM (C-FPM) [35,47,54], slurry blending (SB), vapor-based synthesis, shift-speed ball milling (SSBM), and high-shear pre-dispersion and SSBM (HSPD/SSBM), which are then followed by various consolidation routes of the mixture such as hot extrusion [27,55], spark plasma sintering [47,56,57], friction stir processing [58,59], hot rolling [19,46,60], and others [5,36]. Significant advances can be underlined in the field of solid-phase powder metallurgy (PM) techniques [47].…”

Hot deformation behaviour of bimodal sized Al2O3/Al nanocomposites fabricated by spark plasma sintering

“…In the past few years, little attention has been paid to the conflict between strength‐ductility of the bimodal sized Al 2 O 3 /Al nanocomposites, especially in their high‐temperature applications. Although the design of bimodal structure has successfully improved the overall mechanical performance of PAMNCs at room temperature (Sajjadi et al ., 2012; Cavaliere et al ., 2019). Besides, most done studies on PAMNCs relating to high‐temperature applications were concentrated on a unireinforced nanocomposite with matrix of Al alloy (Asgharzadeh & Simchi, 2008; Asgharzadeh et al ., 2011; Atrian et al ., 2015; Ezatpour et al ., 2015; Li et al ., 2016; Wang et al ., 2017).…”

“…The improvement of the microstructural behaviour of bimodal reinforced spark plasma sintered aluminium‐based nanocomposites is also demonstrated by the increase in the wear properties (Cavaliere et al ., 2018). Obviously, porosity plays a crucial role, after hot forming, all the properties of the spark plasma sintered materials improve thanks to the porosity reduction (Cavaliere, 2019). Bardi et al .…”

“…(2003) studied the high‐temperature plasticity of a PM Al 2014 alloy and shown that temperature dependent threshold stress is a constant fraction (15%) of the Orowan stress generated by the dispersion of alumina particles and of precipitated intermetallic phases. Very few studies are presented in literature on the constitutive modelling of aluminium alloys matrix nanocomposites produced via SPS and hot formed (Cavaliere et al ., 2019; Nayak & Date, 2019; Sadeghi & Cavaliere, 2019). Here, the recrystallisation behaviour is dependent on the reinforcement dimensions and percentages as well as on the processing parameters (Dingley, 2004; Garay, 2010; Ezatpour et al ., 2015).…”

“…The whole sintering period (including heating and cooling time) was less than 25 min. Samples were then furnace cooled to room temperature in vacuum atmosphere (Sadeghi et al ., 2017a, 2020, 2018e, 2018f; Cavaliere et al ., 2019; Sadeghi & Cavaliere, 2019).…”