Abstract
Two magnesium matrix composites reinforced with 3 and 10% Ni-Ti particulates, respectively, were obtained by plasma sintering. The reinforcement material was obtained by grinding a mixture of powders of 68% Ni and 32% Ti atomic percent in a high energy mill for 40 hours. Particulates resulting from mechanical alloying have a partially amorphous and partially nanocrystalline structure, consisting of the following phases: Ni solid solution, Ti2Ni and NiTi (B2) phase. After sintering, both the matrix and the reinforcement material are nanocrystalline and the particulates have a polyphase structure, consisting of Ni(Ti), NiTi (R phase) and Ni4Ti3. The hardness of these composites is superior to the hardness of magnesium matrix composites reinforced with Ni-Ti particulates having 50% Ni / 50% Ti and 32% Ni / 68% Ti chemical compositions obtained under the same conditions and corresponding proportions of reinforcement material.
Highlights
Two magnesium matrix composites reinforced with 3 and 10% Ni-Ti particulates, respectively, were obtained by plasma sintering
The existence of a solid solution and not of pure nickel in powder mixture after grinding is certified by shifting to the left, at smaller angles, the diffraction lines associated with the solid solution phase as against those of Ni, shown in Figure 1 - below, with the corresponding modification of interplanar distances
The enlargement of the diffraction peaks associated with this phase is attributed to a reduction in dimensions of the coherent dispersion blocks, a common phenomenon in the case of mechanical alloying by grinding in high energy mills [8-10]
Summary
Two magnesium matrix composites reinforced with 3 and 10% Ni-Ti particulates, respectively, were obtained by plasma sintering. The Ni-Ti system with 68% Ni and 32% Ti (atomic percentages) was chosen as a reinforcement material for the magnesium matrix, and the reinforcement Ni-Ti particulates were obtained by mechanical alloying of the elemental powders in the specified proportions.
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