Processing, microstructure and mechanical properties of Al-based metal matrix composites reinforced with mechanically al
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S. Scudino IFW Dresden, Institut für Komplexe Materialien, Postfach 270116, D-01171 Dresden, Germany
N.K. Mukhopadhyay Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi-221005, India
J. Eckertb) Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, A-8700 Leoben, Austria; and Department Materials Physics, Montanuniversität Leoben, A-8700 Leoben, Austria (Received 1 December 2015; accepted 28 March 2016)
Al-based composites reinforced with Mg–7.4%Al mechanically alloyed particles have been synthesized by hot pressing followed by hot extrusion. Microstructural characterization of the bulk samples reveals the phase transformation of the reinforced particles (Mg(Al)ss 1 c-Al12Mg17) to the stable intermetallic b-Al3Mg2 phase which occurs during consolidation. The phase transformation leads to the increase of effective volume faction of the reinforcement along with strong interfacial bonding, which causes a significant increase of the strength of the composites retaining appreciable plastic deformation. The strengthening can be attributed to the reduction of ligament size and to the interface strengthening due to better interface bonding (load-transfer) between the Al-matrix and the reinforcing particles.
I. INTRODUCTION
Metal matrix composites (MMCs) have a great potential to be used in transport applications due to their improved and tunable properties.1–5 The properties of metallic matrices can be significantly improved by introducing hard reinforcing particles.1–9 A typical example is given by the Al-based composites, whose hardness, strength, and Young’s modulus can be effectively enhanced by the addition of small amounts of nanocrystalline ceramic/intermetallic particles.3–9 The improvement of the properties is attributed to the dislocation strengthening, grain size reduction, and increase of load bearing efficiency of the matrix.1–4 Different types of reinforcement materials, ranging from the typical ceramic, such as Al2O3, AlN, and SiC,10–12 to more unconventional reinforcements, such as quasicrystals13,14 and complex metallic alloys,2 have been successfully used as reinforcements in MMCs. Other possible Contributing Editor: Yang-T. Cheng a) Address all correspondence to this author. e-mail: [email protected] b) This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs. org/jmr-editor-manuscripts/. A previous error in this article has been corrected, see 10.1557/jmr.2016.192. DOI: 10.1557/jmr.2016.156 J. Mater. Res., Vol. 31, No. 9, May 14, 2016
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candidates as reinforcing agents in MMCs are amorphous, partially amorphous, and nanocrystalline Al-based alloys, which have attracted widespread attention as potential candidates for structural as well as functional applications due to their high strength combined with low density.15,16 During the past years, several meth
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