In-situ synthesis and characterization of nano-structured NiAl-Al2O3 composite during high energy ball milling
Author: Maryam Beyhaghi a, ⁎, Jalil Vahdati Khaki b , Maykel Manawan c,d , Alireza Kiani-Rashid b , Mehrdad Kashefi b , Stefan Jonsson e a Department of Metallurgy and Ceramics, Faculty of Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran b Department of Metallurgical and Materials Engineering, Ferdowsi University of Mashhad, 91775-1111 Mashhad, Iran c Department of Physics, Universitas Indonesia, Depok 16424, Indonesia d Energy Engineering, Politeknik Negeri Jakarta, Depok 1624, Indonesia e Department of Materials Science and Engineering, Royal Institute of Technology, SE-10044 Stockholm, Sweden Category: DownloadIn this work, synthesis of NiAl–Al2O3 nanocomposite powders via the mechanosynthesis route and by using Ni,
NiO and Al is investigated. Ignition of the reaction inside the ball-mill vial happens after 110 min; NiO is totally
finished and NiAl and Al2O3 as product phases are formed. After 10 h of ball milling, raw materials are totally
used in the reaction and only product phases exist in the vial. By continuing the ball milling process to 60 h, better
mixing of the synthesized phases and decrement in their crystallite sizes plus particle size are observed. Crystallite sizes of the product phases are in the nanometer range in all ball milling times. Crystallite sizes of NiAl and
Al2O3 after 10 h are around 11 nm and 19 nm respectively, and these are reduced to around 8 nm for both phases
after 60 h of ball milling.
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