RT Journal Article
ID 369171c40a53056b
A1 Shahzad, Aamir
A1 Abuzin, Yu. A. 
A1 Karashaev, M. M. 
T1 <i>IN SITU </i>FABRICATION OF Ni<sub>x</sub>Al<sub>x</sub> INTERMETALLIC REINFORCEMENT PARTICLES AND OF Al-MATRIX COMPOSITE REINFORCED WITH THOSE PARTICLES
JF Nanoscience and Technology: An International Journal
JO NST
YR 2017
FD 2017-11-29
VO 8
IS 3
SP 211
OP 222
K1 in situ MMC formation
K1 Ni–Al composite granules
K1 mechanical activation
K1 planetary ball milling
K1 nanosize thickness of reaction-ready Ni–Al contact
K1 synthesizing
AB In this work, Al-matrix composite reinforced with 20&#37; 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, Ni<sub>3</sub>–Al, and Al<sub>3</sub>–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 &mu;m<sup>2</sup> 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.

PB Begell House
LK https://www.dl.begellhouse.com/journals/11e12455066dab5d,17f1428b46459361,369171c40a53056b.html