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Nanoscience and Technology: An International Journal
ESCI SJR: 0.219 SNIP: 0.484 CiteScore™: 0.37

ISSN Print: 2572-4258
ISSN Online: 2572-4266

Nanoscience and Technology: An International Journal

Formerly Known as Nanomechanics Science and Technology: An International Journal

DOI: 10.1615/NanoSciTechnolIntJ.v8.i3.40
pages 211-222

IN SITU FABRICATION OF NixAlx INTERMETALLIC REINFORCEMENT PARTICLES AND OF Al-MATRIX COMPOSITE REINFORCED WITH THOSE PARTICLES

Aamir Shahzad
National University of Science and Technology (MISIS), 4 Leninsky Ave., Moscow 119049, Russia
Yu. A. Abuzin
National University of Science and Technology (MISIS), 4 Leninsky Ave., Moscow 119049, Russia
M. M. Karashaev
National University of Science and Technology (MISIS), 4 Leninsky Ave., Moscow 119049, Russia

ABSTRACT

In this work, Al-matrix composite reinforced with 20% NiAl intermetallide was fabricated, in situ, by high-energy ball milling. The main aim and novelty of this research are to utilize the heat produced during the synthesis of Ni–Al powder while preparing Ni–Al reinforced Al-matrix composite. The heat trapped in the chamber of a high-energy ball mill can be used for various purposes, i.e., it can enhance the bonding between the reinforcing particles and matrix significantly. Also, post-mechanical alloying process (annealing, etc.) can be eliminated. Highly activated Ni–Al composite granules were used as precursors of the reinforcement material in such a way that all the heat released during the formation of Ni–Al intermetallide from those composite granules is trapped inside the milling chamber which aids in ensuring good adhesion between the reinforcement particles and the Al matrix. The powder mixture was worked at a speed of 100, 200, and 300 rpm in a planetary ball mill for different periods of time. Composite granules of Ni–Al, Ni3–Al, and Al3–Ni systems were prepared and then the activity of those composite granules was measured, with Ni–Al exhibiting the highest activity among them; therefore, we chose this system for the reinforcement purposes. Every composite granule has a lamellar structure with reaction-ready contact of Ni with Al of nanosize in depth and over 200,000 μm2 area. Reaction-ready granules are the granules that were obtained just before the reaction time (critical time). These highly activated reaction-ready composite granules were then used as precursors of the reinforcement material. NiAl- and Al-matrix composites were successfully produced in situ using a PM 400 (Retsch, Gmbh) planetary ball mill at the 200 rpm speed after 100 min. Structural studies were performed using a Vega 3 scanning electron microscope. An X-ray diffraction analysis was performed on a Bruker D8 Advance diffractometer.


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