Journal
ADVANCED POWDER TECHNOLOGY
Volume 32, Issue 10, Pages 3826-3844Publisher
ELSEVIER
DOI: 10.1016/j.apt.2021.08.031
Keywords
Ball milling; Aluminum; Metal matrix composites; Powder metallurgy; Mechanical properties
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Funding
- Scientific Research Projects Coordination Unit of Selcuk University [20401019]
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The study focused on producing yttria nanoparticle reinforced 7075 aluminum alloy composite using mechanical milling technique, which showed a significant enhancement in hardness and ultimate tensile strength compared to the reference aluminum alloy. Microstructural analysis was conducted to discuss the reasons behind the increase in mechanical properties.
Mechanical milling presents an effective solution in producing a homogenous structure for composites. The present study focused on the production of 0.5 wt% yttria nanoparticle reinforced 7075 aluminum alloy composite in order to examine the effects of yttria dispersion and interfacial bonding by ball milling technique. The 7075 aluminum alloy powders and yttria were mechanically alloyed with different milling times. The milled composites powders were then consolidated with the help of hot pressing. Hardness, density, and tensile tests were carried out for characterizing the mechanical properties of the composite. The milled powder and the microstructural evolution of the composites were analyzed utilizing scanning and transmission electron microscopy. A striking enhancement of 164% and 90% in hardness and ultimate tensile strength, respectively, were found compared with the reference 7075 aluminum alloy fabricated with the same producing history. The origins of the observed increase in hardness and strength were discussed within the strengthening mechanisms' framework. (c) 2021 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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