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JOM

, Volume 71, Issue 12, pp 4778–4788 | Cite as

Influence of Thermal Deformation Parameters on Mechanical Properties and Microstructure Evolution of AA7075 Aluminum Alloy during Hot Stamping-Quenching Process

  • Huanhuan Li
  • Zhili Hu
  • Lin HuaEmail author
  • Qian Sun
Microstructure Evolution During Deformation Processing
First Online:
  • 86 Downloads

Abstract

Hot tensile tests have been performed on AA7075 aluminum alloy to investigate the effects of temperature and strain rate on its deformation behavior during the hot stamping-quenching process. The corresponding mechanical properties and associated microstructures have also been studied. The results indicate that the flow behavior curves exhibit work hardening, a dynamic equilibrium, then a dramatic decrease, ultimately leading to fracture. Ductility of over 30% can be obtained at relatively low deformation temperature and strain rate. The fracture mechanism changes from ductile transgranular fracture to ductile intergranular fracture owing to the weakening of the grain-boundary strength at high temperatures. The strength of the tested samples after artificial aging treatment increases with the deformation temperature after solid-solution heat treatment. It is more appropriate to choose a temperature of 400°C and a strain rate of 0.1–1 s−1 for AA7075 aluminum alloy parts to simultaneously obtain the desired ductility and final strength in this process.

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Notes

Acknowledgements

This work is financially supported by the National Natural Science Foundation of China (U1564202), the National Natural Science Foundation of China (Grant No. 51405358 and 51775397), the 111 Project (B17034), the Outstanding Young and Middle-aged Science and Technology Innovation Team Plan of Hubei Provincial Department of Education (No. T201629), and the Innovative Research Team Development Program of Ministry of Education of China (IRT13087), who the authors gratefully thank with sincere appreciation.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Huanhuan Li
    • 1
    • 2
    • 3
  • Zhili Hu
    • 2
    • 3
  • Lin Hua
    • 1
    • 2
    • 3
    Email author
  • Qian Sun
    • 2
    • 3
  1. 1.School of Materials Science and EngineeringWuhan University of TechnologyWuhanPeople’s Republic of China
  2. 2.Hubei Key Laboratory of Advanced Technology of Automobile PartsWuhan University of TechnologyWuhanPeople’s Republic of China
  3. 3.Hubei Collaborative Innovation Center for Automotive Components TechnologyWuhan University of TechnologyWuhanPeople’s Republic of China

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