Abstract
In situ synchrotron X-ray radiography observations of the Zr-poisoning phenomenon of an Al-20 wt pct Zn alloy inoculated by Al-5Ti-1B were carried out. The effects of Zr addition on heterogeneous nucleation, grain growth, and final grain size were quantitatively studied and further analyzed using the interdependence model. The experimental results show that the undercooling needed for nucleation increases and the nucleation rate decreases at the early stage of solidification with Zr addition, resulting in fast grain growth, a high solidification rate and increased severity of solute segregation in the solid–liquid coexistence regions. At the same time, the poisoning is a progressive process that is enhanced with the increasing Zr content, holding temperature, and holding time. The nucleation-free zone of the Zr-containing sample, either measured from the radiographs or calculated by the interdependency theory, is larger than that of the Zr-free sample. Our analysis shows that both the increase in the nucleation-free zone and the average interparticle spacing of the most potent available nucleation particles contribute to the increase of the grain size caused by Zr poisoning.
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Acknowledgments
The authors express their gratitude for the financial support from the National Key R&D Program of China (No. 2016YFB0701405), the National Science Foundation of China (Nos. 51627802, 51704196, 51771118 and 51704195), and the Shanghai Science and Technology Committee (No. 16DZ2260602).
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Manuscript submitted February 8, 2018.
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Appendix
The Zn and Zr contents of 0Zr and 0.2Zr samples are detected by inductive coupled plasma emission spectrometer (ICP-ES) as shown in Table A1. Then the liquidus temperature of each sample at equilibrium solidification condition is determined by JMatPro calculation. The DSC results are shown in Figure A1. The turning points are regarded as the temperature of the beginning of solidification. The undercooling for the nucleation of most potent particles is obtained by liquidus temperature minus the turning point of DSC result as shown in Table A1.
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Jia, Y., Wang, S., Huang, H. et al. In Situ Observation of the Zr Poisoning Effect in Al Alloys Inoculated by Al-Ti-B. Metall Mater Trans A 49, 4771–4784 (2018). https://doi.org/10.1007/s11661-018-4834-6
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DOI: https://doi.org/10.1007/s11661-018-4834-6