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Evolution of the interfacial layer and its effect on mechanical properties in TiO_2 nanopartide reinforced aluminum matrix composites

机译：TiO_2纳米粒子增强铝基复合材料界面层的演变及其对力学性能的影响

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摘要

For aluminum based composites reinforced with titanium dioxide (TiO_2), the variations of the interface layer during annealing and their effect on mechanical properties have been investigated. Three different types of reinforcing TiO_2 particles (i.e., 15, 50, and 300 nm) are used, and the composites are annealed at 500 ℃ for up to 24 h. The small 15 nm particle with high chemical potential energy can induce the enhanced decomposition process, leading to the extension of the interfacial layer during up to 12 h of annealing, in which Ti and O atoms are alloyed in an aluminum structure. The alloyed interface layer has beneficial effects on mechanical properties of aluminum based composites in terms of the elastic modulus and yield stress. Furthermore, elongation to failure increases since the alloyed interfacial layer does not interfere with the movement of dislocations emitted at the interface of the particle, which continuously decomposes and shrinks during annealing. Further annealing stimulates the reduction processes, inducing the formation of α-Al_2O_3 and Al_3Ti in the layer. When the particle size is 300 nm, the interfacial evolution behavior cannot be observed at the interface due to the negligible decomposition behavior of the particle under the annealing condition.
机译：对于二氧化钛（TiO_2）增强的铝基复合材料，研究了退火过程中界面层的变化及其对机械性能的影响。使用三种不同类型的增强TiO_2颗粒（即15、50和300 nm），并将复合材料在500℃下退火长达24小时。具有高化学势能的15 nm小颗粒可以诱导增强的分解过程，从而导致在长达12 h的退火过程中界面层扩展，其中Ti和O原子以铝结构形成合金。合金化的界面层在弹性模量和屈服应力方面对铝基复合材料的机械性能具有有益的影响。此外，由于合金化的界面层不干扰在颗粒的界面处发射的位错的运动，破坏的伸长率增加，该位错的运动在退火期间连续分解和收缩。进一步的退火会刺激还原过程，从而导致在该层中形成α-Al_2O_3和Al_3Ti。当颗粒尺寸为300nm时，由于在退火条件下颗粒的分解行为可忽略，因此在界面处不能观察到界面演化行为。

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