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Effect of Solution Treatment on the Microstructure and Fatigue Properties of 7050 Aluminum Alloy

  • Xiang Xiao
  • Wei Li
  • Jian Zhao
  • Cheng Liu
Conference paper

Abstract

The primary requirement of aircraft design is safety. The fatigue fracture is difficult to detect and prevent, which is a major safety hazard during aircraft service. In this paper, the influence of solution heat treatment on the microstructure and resistant of fatigue crack growth of 7050 alloy is investigated. For one-stage solution heat treatment, with the solution temperature increases, the area fraction of the coarse constituent phase decreases and the recrystallization fraction increase, and conresponsively the strength and fracture toughness increase and the fatigue crack growth rates decrease. Under the two-stage solution heat treatment, the alloy has the best fatigue crack growth resistance compare with the one-stage solution heat treatments. The effect of solution heat treatment on the properties can be understood on the basis of the combined influence of the constituent phase and the recrystallized fraction.

Keywords

Aluminum alloy 7050 Solution treatment Microstructure Fatigue properties 

Notes

Acknowledgements

This work was supported by The National Key R&D Program of China (Project No. 2016YFB0300900).

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Chinalco Materials & Application Research InstituteBeijingChina
  2. 2.Suzhou Research Institute for Nonferrous MetalsSuzhouChina

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