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Demixing phenomena in NiAl nanometre-sized particles

机译:NiAl纳米颗粒中的混合现象

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Numerical simulations have been used to investigate the melting behaviour of unsupported Al, Ni and NiAl particles in the approximate size range between 1 and 10 nm. A depression of melting points, more pronounced for NiAl rather than for Ni particles, was observed. The melting point of NiAl particles with a size below 4 nm is found to be lower than that of the corresponding Ni particles. Under such circumstances, local fluctuations in the distribution of atomic species within the particles promote a demixing process of Ni and Al species. Particles consisting of a solid Ni-rich interior and a molten Al-rich surface layer are thus formed.
机译:数值模拟已用于研究大约1至10 nm尺寸范围内的无载体Al,Ni和NiAl颗粒的熔化行为。观察到熔点降低,对于NiAl而不是对于Ni颗粒而言更明显。发现尺寸小于4nm的NiAl颗粒的熔点低于相应的Ni颗粒的熔点。在这种情况下,粒子中原子种类分布的局部波动会促进Ni和Al种类的分解过程。由此形成由固体富Ni内部和熔融Al富表面层组成的颗粒。

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