In Situ Observation of the Zr Poisoning Effect in Al Alloys Inoculated by Al-Ti-B

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science - Tập 49 - Trang 4771-4784 - 2018
Yiwang Jia1, Shubin Wang1, Haijun Huang1, Donghong Wang1, Yanan Fu2, Guoliang Zhu1, Anping Dong1,3, Dafan Du1, Da Shu1,3, Baode Sun1,4,5
1Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
2Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, CAS, Shanghai, China
3Materials Genome Initiative Center, Shanghai Jiao Tong University, Shanghai, China
4State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, China
5Shanghai Innovation Institute for Materials, Shanghai, China

Tóm tắt

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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Thông tin xuất bản

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Tập 49

4771-4784

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