مقاله Fabrication Of NiAl–Al2O3 Nanocomposite By Mechanical Alloying For ICNN 2008

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چکیده:

Particulate composites are produced by adding reinforcement particles to the matrix. In the case of nanocomposites, however, uniform dispersion of the reinforcement particles throughout the matrix is a challenging task. Recently, ultrasonic stirring, high-energy mechanical milling and internal oxidation have been used to overcome the problem, i.e. distributing nanoscaled particles throughout the matrix [1].Mechanochemical synthesis involves mechanical activation of solid state displacement reactions in a ball mill. Thus, mechanical energy is used to induce chemical reactions. The chemical precursors typically consist of mixtures of oxides, chlorides and/or metals that react either during milling or during subsequent heat treatment to form a composite powder consisting of the dispersion of ultrafine particles within a matrix [2, 3].An earlier study demonstrated the Synthesis of Nanocrystalline NiAl by Mechanical Alloying of Ni and Al Powder Mixtures [4]. In this work NiAl–Al2O3 Nanocomposite was synthesized by mechanical alloying. The phase transformation occurring in MA process was investigated