Publication: Matrix grain characterisation by electron backscattering diffraction of powder metallurgy aluminum matrix composites reinforced with MoSi_2 intermetallic particles
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2010-11
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Elsevier Science Inc
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The mechanical properties of particle-reinforced aluminum matrix composites (AMCs) are largely dependent on the microstructure of the materials, which in turn is largely dependent on the processing history [1]. Powder metallurgy (PM) is a commonly used processing technique for producing AMCs since it can reduce reinforcement segregation, typical of casting metallurgy processes [2]. When there is a large size difference between reinforcing and aluminum particles, high energy ball milling (BM) is used to manufacture AMCs successfully [3,4]. In the BM process, the aluminum particles are fragmented and re-welded continuously, during which the brittle reinforcing particles are fragmented and become embedded in the softer aluminum matter. EBSD has been used extensively to characterise submicrometer microstructure in monolithic deformed alloys [5,6]. However, to the authors' knowledge, EBSD has scarcely been used to investigate AMCs and there is limited information on the matrix microstructure of milled AMCs after consolidation processes such as extrusion [7–9]. In the present work, electron back-scattered diffraction (EBSD) has been used to characterise matrix grain size and grain orientation in six powder metallurgy AA6061/MoSi2/15p composites and three unreinforced matrices processed with and without ball milling, followed by hot extrusion. The aim is to know the effect of milling on the matrix grain structure of extruded AMCs
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© 2010 Elsevier Inc.
The authors gratefully acknowledge the financial support of the Spanish project MAT2006 01251 Thanks are also due to Dr M T Perez Prado for helpful discussion
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[1] Clyne TW, Withers PJ. An Introduction to Metal Matrix Composites. Cambridge University Press; 1993.
[2] Borrego A, Fernández R, Cristina MC, Ibáñez J, González-Doncel G. Influence of extrusion temperature on the microstructure and the texture of 6061Al-15 vol.%SiCw PM composites. Comp Sci Technol 2002;62:731–42.
[3] Corrochano J, Lieblich M, Ibáñez J. On the role of matrix grain size and particulate reinforcement on the hardness of powder metallurgy Al–Mg–Si/MoSi2 composites. Comp Sci Technol 2009;69:1818–24.
[4] Parvin N, Assadifard RR, Safarzadeh P, Sheibani S, Marashi P. Preparation and mechanical properties of SiC-reinforced Al6061 composite by mechanical alloying. Mater Sci Eng 2008; A492:134–40.
[5] Kubota M, Cizek P, Rainforth WM. Properties of mechanical milled and spark plasma sintered Al-15 at.% MgB2 composite materials. Comp Sci Technol 2008;66:888–95.
[6] Jazaeri H, Humpreys FJ. The transition from discontinuous to continuous recrystallization in some aluminium alloys I — the deformed state. Acta Mater 2004;52:3239–50.
[7] Park Young S, Chung Kyung H, Kimb Nack J, Lavernia EJ. Microstructural investigation of nanocrystalline bulk Al–Mg alloy fabricated by cryomilling and extrusion. Mater Sci Eng A 2004;374:211–26.
[8] Angers R, Krishnadev MR, Tremblay R, Corriveau JF, Dubé D. Characterization of SiCp/2024 aluminum alloy composites prepared by mechanical processing in a low energy ball mill. Mater Sci Eng A 1999;262(1–2):9–15.
[9] Fogagnolo JB, Velasco F, Robert MH, Torralba JM. Effect of mechanical alloying on the morphology, microstructure and properties of aluminium matrix composite powders. Mater Sci Eng A 2003;342(1–2):131–43.
[10] Apps PJ, Bowen JR, Prangnell PB. The effect of coarse second-phase particles on the rate of grain refinement during severe deformation processing. Acta Mater 2003;51:2811–22.
[11] Doherty RD, Hughes DA, Humphreys FJ, Jonas JJ, Jull Jensen D, Kassner ME, et al. Current issues in recrystallization: a review. Mater Sci Eng A 1997;238:219–74.
[12] Witkin DB, Lavernia EJ. Synthesis and mechanical behavior of nanostructured materials via cryomilling. Prog Mater Sci 2006;5:1–60.
[13] McHargue CJ, Jetter LK, Ogle JC. Preferred orientation in extruded aluminum rod. Trans Met Soc AIME 1959;215:831–7.
[14] Humphreys FJ, Hatherly M. Recrystallization and Related Annealing Phenomena. second ed. Oxford: Elsevier; 2004