Effect of mechanical alloying and heat treatment process on the phase transformation of Ni-Cr-Al powders mixture

Subject Areas : journal of New Materials

امیررضا شیرانی ¹ , علی شکوه فر ² , محمد حسین عنایتی ³

1 - نویسنده
2 - نویسنده
3 - نویسنده

Received: 2015-12-30 Accepted : 2015-12-30 Published : 2010-09-23

Keywords: Intermetallic Compounds, CrNiAl, Mechanical alloying (MA), nanostructure materials,

Abstract :

In this study Ni₅₀Al₅₀ and Ni₂₅Cr₂₅Al₅₀ were undergone mechanical alloying and heat treatment. The structural changes of powder particles during processes were studied by X-ray diffraction (XRD). It appeared that there are different phase transformations after both treatments: Ni₅₀Al₅₀ formed a nanocrystalline, orderly NiAl intermetallic compound; on the other hand (NiCr)Al intermetallic which itself was produced from Ni₅₀Cr₂₅Al₂₅. The morphology and cross sectional area of the powder particles were characterized by scanning electron microscopy (SEM). The conclusion was that during initial stages of milling the layers of Cr, Ni, and Al are produced which subsequently are transformed into the final product upon further treatments.

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