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China Foundry

, Volume 16, Issue 2, pp 97–104 | Cite as

Phase-field simulation of secondary dendrite growth in directional solidification of binary alloys

  • Li FengEmail author
  • Ni-ni Lu
  • Ya-long Gao
  • Chang-sheng Zhu
  • Jun-he Zhong
  • Rong-zhen Xiao
Research & Development
  • 39 Downloads

Abstract

Phase field method was used to simulate the effect of grains orientation angle θ11 and azimuth θA of non-preferentially growing dendrites on the secondary dendrites of preferentially growing dendrites. In the simulation process, two single-factor influence experiments were designed for columnar crystal structures. The simulation results showed that, when θ11 < 45° and θA < 45°, as θ11 was enlarged, the growth direction of the secondary dendrites on the preferentially growing dendrites at the converging grain boundary (GB) presented an increasing inclination to that of preferentially growing dendrites; with increasing θA, the growth direction of the secondary dendrites on the preferentially growing dendrites at the converging GB exhibited greater deflection, and the secondary dendrites grew with branches; the secondary dendrites on the preferentially growing dendrites at diverging GBs grew along a direction vertical to the growth direction of the preferentially growing dendrites. When θA = 45° and θ11 = 45°, the secondary dendrites grew in a direction vertical to the growth direction of preferentially growing dendrites. The morphologies of the dendrites obtained through simulation can also be found in metallographs of practical solidification experiments. This implies that the effect of a grain’s orientation angle and azimuth of non-preferentially growing dendrites on the secondary dendrites of preferentially growing dendrites does exist and frequently appears in the practical solidification process.

Key words

phase-field method binary alloy directional solidification secondary dendrites 

CLC numbers

TP391.9 

Document code

Notes

Acknowledgements

This work is supported by the National Natural Science Foundation of China (Grant Nos.: 11504149, 11364024, and 51661020).

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Copyright information

© Foundry Journal Agency and Springer Singapore 2019

Authors and Affiliations

  • Li Feng
    • 1
    • 2
    Email author
  • Ni-ni Lu
    • 1
  • Ya-long Gao
    • 1
  • Chang-sheng Zhu
    • 2
  • Jun-he Zhong
    • 1
  • Rong-zhen Xiao
    • 1
    • 2
  1. 1.College of Materials and EngineeringLanzhou University of TechnologyLanzhouChina
  2. 2.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous MetalsLanzhou University of TechnologyLanzhouChina

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