Formation process of the amorphous MgNi by mechanical alloying

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Abstract
To clarify the formation process of amorphous MgNi (a-MgNi) by mechanical alloying (MA), we have investigated the time evolution of structural changes of the alloy, Mg-50 at.%Ni, synthesized from Mg2Ni and Ni powders under various MA-times. The amorphous-like phase in the powder particle of the alloy increases with increasing MA-time, and the almost single a-MgNi phase is formed after 288 ks of MA-time. At an earlier stage in MA, the crystals of Mg2Ni are nanostructured, and the nanostructured Mg2Ni (n-Mg2Ni) and Ni are kneaded with each other in the powder particles. With increasing MA-time, the n-Mg2 region containing Ni kneaded has increased and transformed to the amorphous-like phase. From the observation of high-resolution transmission electron microscopy (HRTEM), it has been made clear that the nucleation of amorphization in the alloy occurs on the interface between n-Mg2Ni and Ni regions and progresses toward the inside of the n-Mg2Ni region.

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