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Study on mechanical behavior and fracture mechanism of 2219 aluminum alloy with different heat treatment conditions under dynamic loading
Clc Number:

TG391

Fund Project:

The Key Research and Development Plan Projects in Hubei Province (2020BAB139),The National Natural Science Foundation of China (General Program) (51975229),The Application Foundation Frontier Project of Wuhan (2020010601012178)

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    Abstract:

    In this paper, the mechanical response and fracture mechanism of 2219 aluminum alloy with different heat treatment conditions under dynamic loading were studied by means of split Hopkinson tension bar experiment. The results show that: The tensile strength and strain rate sensitivity of 2219-T6 and 2219-T4 increase with the increase of strain rate, while that of 2219-O increases first and then decreases. And the strain rate sensitivity and strain hardening rate of 2219 aluminum alloy decrease with the increase of strain; Under the dynamic loading conditions, the material forms the partial dissociation morphology and the morphology of the second phase particle break under the higher stress concentration degree, and at higher strain rate (≥650 s-1), with the increase of strain rate, the stress concentration degree becomes higher, and the proportion of dissociation morphology becomes larger. At the same time due to the material can still undergo a certain amount of deformation at the same time of crack propagation, the material as a whole has a higher forming limit under the higher strain rate (≥650 s-1), it also leads to the formation of fracture morphology with low plasticity under the action of higher work hardening.

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[Zhang Huiping, Huang Liang, Wang Zeyu, Zhao Mingjie, Xu Jiahui, Li Jianjun. Study on mechanical behavior and fracture mechanism of 2219 aluminum alloy with different heat treatment conditions under dynamic loading[J]. Rare Metal Materials and Engineering,2022,51(7):2560~2569.]
DOI:10.12442/j. issn.1002-185X.20210548

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History
  • Received:June 25,2021
  • Revised:August 20,2021
  • Adopted:August 25,2021
  • Online: July 29,2022
  • Published: July 27,2022