Manufacture of Aluminum Nanocomposites: &lt;i&gt;A Critical Review&lt;/i&gt;

Borgonovo, Cecilia; Apelian, Diran

doi:10.4028/www.scientific.net/msf.678.1

Cited by 66 publications

(45 citation statements)

References 39 publications

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“…Figure 2 shows a similarly uniform distribution of Al 2 O 3 nano-sized particles on the 2124-Al powder particles, despite the 5 to 10 vol.% increase in Al 2 O 3 . This finding contradicts results found in liquid-state processing, where Borgonovo and Apelian (2011) found that the tendency of nanoparticles to form agglomerates increased as their volume fraction in the matrix increased. The even distribution found in this work (Figure 2) can be attributed to good blending parameters, as well as the fact that any particle clusters that may have formed were ground as the blending process progressed.…”

Section: Deformation Behaviour Of Aluminium Low-micron Mmcs and Mmncscontrasting

confidence: 56%

“…The ideal composite has an even distribution of the reinforcement phase throughout the matrix (Ferry, 2005), but generating this is a challenge when fabricating both MMCs and MMNCs. In MMCs, the micrometre-sized reinforcing particles tend to settle on the grain boundaries and in MMNCs the nano-sized reinforcing particles form agglomerates (Borgonovo and Apelian, 2011;Casati and Vedani, 2014).…”

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confidence: 99%

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Deformation behaviour of aluminium low-micron MMCs and MMNCs at warm working temperatures (0.3-0.5 Tm)

Gxowa

Chown

Govender³

et al. 2016

J. South. Afr. Inst. Min. Metall.

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Section: Deformation Behaviour Of Aluminium Low-micron Mmcs and Mmncscontrasting

confidence: 56%

mentioning

confidence: 99%

Deformation behaviour of aluminium low-micron MMCs and MMNCs at warm working temperatures (0.3-0.5 Tm)

Gxowa

Chown

Govender³

et al. 2016

J. South. Afr. Inst. Min. Metall.

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“…Many processing routes can be considered to embed nanoparticles into an aluminum matrix, with several having been reported on [5][6][7]. For varies practical reasons, the use of CNTs and engineered nanoparticles (NPs) is separated.…”

Section: Processing Options For Making Alncmentioning

confidence: 99%

“…Adding particles directly to molten metal is an established technology [5,6,10]. Various technical approaches enable fabrication of an aluminum matrix containing extrinsically added second phase particles.…”

Section: Ingot Metallurgymentioning

confidence: 99%

Opportunities for aluminum-based nanocomposites

Weiland

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. High performance aluminum alloys are conventionally made by heat treating alloys containing a variety of alloying elements in solid solution. Key performance attributes are controlled at the microstructural level by tailoring sizes and morphology of nano-sized second phases. This enabled the successful development of aluminum alloys having properties optimized in strength, damage tolerance and corrosion resistance. However, this process is naturally limited by the solubility of alloying elements in the aluminum matrix. In real world products, significant effort is deployed to achieve a homogeneous distribution of the alloying elements both at the macro and micro scales. Despite these efforts, heat treatable alloys can exhibit chemical gradients at grain boundaries, resulting in sub-optimized properties. Additionally, due to the very nature of the strengthening mechanisms, the properties of heattreatable alloys are decreasing when exposed to elevated temperatures. To step outside the boundaries given by the solubility of alloying elements in the aluminum matrix, the extrinsic addition of nano-sized particles to the aluminum matrix is being evaluated. IntroductionImproving the properties of aluminum alloys has a long history. A combination of the established metallurgical mechanisms, cold work, solid solution strengthening and precipitation strengthening, has enabled highly engineered materials to be developed for demanding customer requirements. These requirements typically focus on strength and damage tolerance, while at the same time being of low cost enabling wide spread applications. Many text books cover the underlying mechanisms and how they can be utilized to tailor a materials performance to an application.For a material to be successful commercially, it needs to fulfill a spectrum of property requirements as well as meet a target cost point. Results of new materials or processes are frequently being reported as achievements in tensile strength; however, a successful material for most technical applications must meet not only strength but other properties such as damage tolerance [1] and/or formability. To date, aluminum alloys used for aerospace structures have driven most of the major advancements in material properties. With improvements to manufacturing process and cost structure, these alloys are now finding additional uses in other applications such as transportation. It is not the objective of this paper to review the state of advanced aluminum alloys.Over the years, attempts have been made to step outside of the spectrum enabled by precipitation strengthening and other basic metallurgical methods by using a composite approach. This means adding an extrinsic material in small or large volume fractions to the aluminum matrix to not only improve strength but to also modify the modulus. This material class is commonly referred to as Metal Matrix Composites (MMCs) [2]. When MMCs were developed, most second phase materials that were combined with the aluminum matrix where particles with sizes ...

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“…Lightweighting through increasing the use of high strength-to-weight ratio Al alloys has been a global trend in recent years [1][2][3]. In order to produce qualified Al alloy materials with good foundry, deformation and mechanical properties, grain refinement by addition of refiners, such as Al-Ti, Al-Ti-B etc., has been an established industrial practice [4][5][6].…”

Section: Introductionmentioning

confidence: 99%