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In situ Investigation of the Heterogeneous Nucleation Sequence in Al-15 Weight Percent Cu Alloy Inoculated by Al-Ti-B

  • Yiwang Jia
  • Donghong Wang
  • Yanan Fu
  • Anping Dong
  • Guoliang Zhu
  • Da ShuEmail author
  • Baode Sun
Article
  • 8 Downloads

Abstract

The sequence of heterogeneous nucleation events is investigated in situ via synchrotron-based X-ray radiography on Al-15 wt pct Cu alloy. In addition to the normal wave-like nucleation, which is predominant ahead of the solidification front when the temperature gradient moves across the field of view, two other types of nucleation are observed: nucleation among the growing grains and nucleation at one site. The nucleation among the growing grains occurs on the less potent TiB2 particles and accounts for ~ 20 pct regardless of the cooling rates. The third type is the nucleation at one site at cooling rates below 8 K/min and gradually weakens with the increasing cooling rate, which is probably due to the agglomeration of inoculant particles. The latter two types of nucleation are believed to be important for increasing the efficiency of nucleant particles.

Notes

Acknowledgments

The authors express their gratitude for the financial support from the National Science Foundation of China (Nos. 51821001, U1832183, and 51771118).

Supplementary material

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Supplementary material 1 (MP4 12614 kb)
11661_2019_5144_MOESM2_ESM.mp4 (3.9 mb)
Supplementary material 2 (MP4 4021 kb)

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • Yiwang Jia
    • 1
  • Donghong Wang
    • 1
  • Yanan Fu
    • 2
  • Anping Dong
    • 1
  • Guoliang Zhu
    • 1
  • Da Shu
    • 1
    Email author
  • Baode Sun
    • 1
    • 3
  1. 1.Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina
  2. 2.Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied PhysicsCASShanghaiChina
  3. 3.State Key Lab of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghaiChina

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