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郑亚亚

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因此簇呈现细长形态以降低自由能ΔG，同时团簇的表面能量占总自由能比例增大，使得给定体积的细长的相干簇具有更大的表面能，同时应变能占总自由能比例降低。紧凑的{111}Al平面相比其它晶面降低具有更低的晶格阻力，析出过程需要的能垒更低，因此团簇团簇位于更紧凑的{111}Al平面上(cluster 2)。而从{111}Al取向到{100}Al取向的转变可进一步的降低总自由能。并在一定条件下发生朝着β"的相变过程.

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Therefore, the clusters exhibit an elongated morphology to reduce the free energy ΔG, while the surface energy of the clusters increases in proportion to the total free energy, so that a given volume of elongated coherent clusters has a larger surface energy, while strain energy accounts for total free energy.
The ratio is reduced.
The compact {111}Al plane has lower lattice resistance than other crystal plane reductions, and the energy barrier required for the precipitation process is lower, so the cluster clusters are located on the more compact {111}Al plane (Cluster 2).
The transition from the {111}Al orientation to the {100}Al orientation further reduces the total free energy.
And under certain conditions, the phase transition process toward β" occurs.