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Title: | Grain refinement of Al-Si alloys by Nb-B inoculation. Part I: concept development and effect on binary alloys |
Authors: | Nowak, M Bolzoni, L Hari Babu, N |
Keywords: | Al alloys;binary alloys;grain refinement;heterogeneous nucleation;Nb–B inoculation |
Issue Date: | 6-Sep-2014 |
Publisher: | Elsevier |
Citation: | Nowak, M., Bolzoni, L. and Hari Babu, N. (2015) 'Grain refinement of Al-Si alloys by Nb-B inoculation. Part I: concept development and effect on binary alloys', Materials and Design, 66 (Part A), pp. 366 - 375. doi: 10.1016/j.matdes.2014.08.066. |
Abstract: | The effect of Nb-B inoculation on Al-Si alloys for their grain refinement has been studied through the analysis of binary Al-xSi (where x = 1-10 wt.%) to avoid possible effects of other alloying elements. In Part I of this work the concept development of the Nb-B inoculation is discussed in detail on the basis of the theoretical and fundamental concepts employed (i.e. pro-peritectic particles formation, lattice structures and mismatch as well as analogies between the Al-Ti/Al-Nb or Ti-Si/Nb-Si binary phase diagrams). The systematic study of the addition of different level of Nb-B inoculation to pure Al permitted to determine the best addition rate. From the microstructural and thermal analysis of binary Al-xSi alloys it is found that Nb-B based inoculation is highly suitable for Al-Si alloy with Si content greater than 6 wt.%. As results of the Nb-B inoculation the microstructural features of binary Al-xSi alloys (i.e. primary Al α-grains and eutectic phase) are significantly refined. Most importantly, the inoculation of Al-Si cast alloys with Nb-B is not characterised by any visible poisoning effect (i.e. formation of silicides) which is the drawback of using commercial Al-Ti-B master alloys on Al cast alloys. The effect of Nb-B inoculation on commercial Al-Si alloys (which normally include other alloying elements in their chemical composition) is assessed in Part II of this work. |
Description: | This article has been made available through the Brunel Open Access Publishing Fund. |
URI: | https://bura.brunel.ac.uk/handle/2438/9653 |
DOI: | https://doi.org/10.1016/j.matdes.2014.08.066 |
metadata.dc.relation.isreplacedby: | 2438/18220 http://bura.brunel.ac.uk/handle/2438/18220 |
ISSN: | 0261-3069 |
Appears in Collections: | Brunel OA Publishing Fund Brunel Centre for Advanced Solidification Technology (BCAST) |
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