Centre of Advanced Materials Processing and Manufacturing (AMPAM), The University of Queensland, St Lucia, QLD, 4072, Australia.
Defence Materials Technology Centre (DMTC), The University of Queensland, St Lucia, QLD 4072, Australia.
Sci Rep. 2017 Aug 29;7(1):9729. doi: 10.1038/s41598-017-10354-6.
The present study investigates the influence of ultrasonic treatment on the grain refinement of commercial purity aluminium with a range of Al3Ti1B master alloy additions. When the aluminium contains the smallest amount of added master alloy, ultrasonics caused significant additional grain refinement compared to that provided by the master alloy alone. However, the influence of ultrasonics on grain size reduces with increasing addition of the master alloy which adds additional TiB particles and Ti solute with each incremental addition. Applying the Interdependence model to analyse the experimentally measured grain sizes revealed that the results of this study and those from similar experiments on an Al-2Cu alloy were consistent when the alloy compositions are converted to their growth restriction factors (Q) and that increasing Q had a major effect on reducing grain size and increasing grain number density. Compared with the application of ultrasonic treatment where an order of magnitude increase in the grain number density is achieved, an increase in the Ti content over the range of master alloy additions, causes the grain number density to increase by approximately three times.
本研究考察了超声波处理对商业纯铝中添加不同范围的 Al3Ti1B 母合金的晶粒细化的影响。当铝中添加的母合金最小时，与仅添加母合金相比，超声波处理会显著增加晶粒细化程度。然而，随着母合金添加量的增加，超声波对晶粒尺寸的影响会减小，因为每增加一次添加都会增加额外的 TiB 颗粒和 Ti 溶质。应用相互依存模型分析实验测量的晶粒尺寸表明，当将合金成分转换为其生长限制因子（Q）时，本研究的结果与类似的 Al-2Cu 合金实验结果一致，并且 Q 的增加对降低晶粒尺寸和增加晶粒数密度有很大影响。与超声波处理相比，在超声波处理中可以实现晶粒数密度的数量级增加，而在母合金添加范围内增加 Ti 含量会使晶粒数密度增加约三倍。
