TEM Characterization on the Nanocomposite Al 7075 and Silver Nanoparticles Synthesized by Powder Metallurgy

Abstract:

Aluminum-based nanocomposites have been produced by mechanical milling, introducing silver nanoparticles within the matrix of a 7075 aluminum alloy using a high energy ball mill. The milled products were compacted by uniaxial load and pressure-less sintered under argon atmosphere, and finally hot extruded. Silver nanoparticles are well dispersed into the matrix of the powder particles as well as in the matrix of the extruded material. Transmission electron microscopy (TEM) analyses are used to corroborate and understand the hypothesis that second-phase particles finely and homogeneously dispersed in the matrix give greater strength to the material. In addition to the strengthening effect, the nanoparticles act like a process control agent (PCA) since the crystallite size of the nanocomposite is smaller at higher contents of nanoparticles.

• Periodical: Materials Science Forum (Volume 644)
• Pages: 9-12
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.644.9
• Online since: March 2010
• Authors: Ruben Flores-Campos, Rogelio Deaquino-Lara, J. Martin Herrera-Ramírez, Arturo Ponce, Ivanovich Estrada-Guel, Mario Miki-Yoshida, Roberto Martínez-Sánchez
• Keywords: Aluminium Alloy, Mechanical Milling, Nanocomposite

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[11] Information on http: /www. matweb. com. 0. 0 0. 5 1. 0 1. 5 50 100 150 200 250 300 350 400 450 σy Pure Al UTS pure Al σy Al7075-O.

[11] UTS Al7075-O.

[11] σy 5 h UTS 5 h σy 10 h UTS 10 h σσσσ (MPa) Ag-C NP Content (wt %) Figure 4. Yield strength σy and ultimate tensile strength (UTS) as a function of the milling time on the Al7075-Ag-C NP nanocomposites, milled for 5 h and 10 h and hot extruded.