Aging Time on the Microstructure and Mechanical Properties of A356 Alloy by Semi-solid Processing

  • Peng Qi
  • Bolong Li
  • Wenjian Lv
  • Shasha Dong
  • Tongbo Wang
  • Ning Li
  • Zuoren Nie
Conference paper

Abstract

An investigation was carried out to study the effects of aging time on the microstructure and mechanical properties of A356 alloy by semi-solid processing. The alloy was subjected to solution treatment for 4 h at 540 °C, artificial ageing was carried out at temperature (170 °C) and different time (0–24 h). The results revealed that the needle-shaped eutectic Si phase in as-cast ingot was transformed to globular shape compared with that by solution treatment. Meanwhile the Chinese script π-Fe(AlMgSiFe) phase was transformed to smaller and uniformly distributed β-Fe(AlFeSi) phase, the elongation increased obviously. With the increasing of aging time, the elongation decreased, and the ultimate tensile strength increased. When the aging time was 4 h, the alloy achieved the optimal mechanical properties. The micro-hardness was 121HV, ultimate tensile strength was 329 MPa, and the elongation was 15%. From the fracture morphology, the fracture for alloy aging for 4 h showed more dimples. With the increasing of aging time, the ultimate tensile strength and the elongation decreased.

Keywords

A356 alloy Semi-solid Aging time Microstructure Tensile properties 

Notes

Acknowledgements

This work was supported by Beijing Municipal Science and Technology Commission (Z161100002116004) and the Beijing Lab project for modern transportation metallic materials and processing technology.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Peng Qi
    • 1
  • Bolong Li
    • 1
  • Wenjian Lv
    • 1
  • Shasha Dong
    • 1
  • Tongbo Wang
    • 1
  • Ning Li
    • 1
  • Zuoren Nie
    • 1
  1. 1.Beijing University of TechnologyChaoyang District, BeijingChina

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