Autor: |
Yixi Chen, Junquan Yu, Xiqing Ge, Yutong Sun, Lu Sun, Wenbin Zhou, Guoqun Zhao |
Jazyk: |
angličtina |
Rok vydání: |
2024 |
Předmět: |
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Zdroj: |
Journal of Materials Research and Technology, Vol 31, Iss , Pp 2915-2929 (2024) |
Druh dokumentu: |
article |
ISSN: |
2238-7854 |
DOI: |
10.1016/j.jmrt.2024.07.013 |
Popis: |
In this paper, the flow behavior, constitutive model and microstructure evolution of solution-treated 2195 Al–Li alloy at temperatures from 123 K to 298 K and strain rates from 2000 s−1 to 5000 s−1 were studied. Experimental results show that the flow stress of the solution-treated 2195 Al–Li alloy is more sensitive to deformation temperature than strain rate. As the temperature declines from 298 K to 123 K, the flow stress at 2000 s−1 and 5000 s−1 increases by nearly 32.8% and 34.5%, respectively; whereas as the strain rate increases from 2000 s−1 to 5000 s−1, the flow stress at 298 K and 123 K only increases by 5.1% and 6.5%, respectively. The average strain hardening rate tends to decline with the increase in strain rate and temperature, and its value at 123 K and 2000 s−1 is about 1.5 times greater than that at 298 K and 5000 s−1. To overcome the very limited applicability of the conventional Arrhenius model with strain compensation, an Arrhenius-based model (c-Arrhenius model) is developed by coupling an independent strain term and then derived by using normalized flow stress and linear regression. To quantify the strain rate effect and temperature effect, a Johnson-Cook-based model (c-Johnson-Cook model) with exponential terms is developed. These two new constitutive models are validated via a comparative analysis, showing good predictability and accuracy. A further microstructure observation shows that the dislocation density is the highest at a strain rate of 5000 s−1 and cryogenic temperature of 123 K, which is beneficial for subsequent aging strengthening. |
Databáze: |
Directory of Open Access Journals |
Externí odkaz: |
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