Effects of grain size on the spall behaviors of high-purity aluminum plates

CHEN Wei; XIE Puchu; LIU Dongsheng; SHI Tongya; LI Zhiguo; WANG Yonggang

doi:10.11883/bzycj-2020-0130

Volume 41 Issue 4

Apr. 2021

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CHEN Wei, XIE Puchu, LIU Dongsheng, SHI Tongya, LI Zhiguo, WANG Yonggang. Effects of grain size on the spall behaviors of high-purity aluminum plates[J]. Explosion And Shock Waves, 2021, 41(4): 043102. doi: 10.11883/bzycj-2020-0130

Citation:

CHEN Wei, XIE Puchu, LIU Dongsheng, SHI Tongya, LI Zhiguo, WANG Yonggang. Effects of grain size on the spall behaviors of high-purity aluminum plates[J]. Explosion And Shock Waves, 2021, 41(4): 043102. doi: 10.11883/bzycj-2020-0130

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Effects of grain size on the spall behaviors of high-purity aluminum plates

doi: 10.11883/bzycj-2020-0130

1.
Key Laboratory of Impact and Safety Engineering, Ministry of Education, Ningbo University, Ningbo 315211, Zhejiang, China
2.
National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2020-05-06
Rev Recd Date: 2020-06-26

Available Online: 2021-03-05

Publish Date: 2021-04-14

Abstract

Abstract

High-purity (HP) aluminum plates were cold rolled and heat treated to produce recrystallized samples with average grain sizes of 60, 100 and 500 μm, respectively. The effects of grain size on the spall response of HP aluminum plates were investigated by plate impact experiments including real-time measurements of the free surface velocity profiles by a compact all-fiber displacement interferometer system for any reflector, and post-impact fractography of soft-recovered samples by optical microscopy and scanning electron microscopy. The effect of grain size on the spall strength depends on the amplitude of peak stress. At lower peak stress loading, the dependence of the spall strength on the grain size is an inverse Hall-Petch relationship, but at higher peak stress loading, the spall strength is nearly constant with little effect of grain size. With the increase of grain size, the distribution range and size of micro-voids in the damaged sample increase, but the number of micro-voids decreases, and the grain refinement caused by the shock compression process is observed. On the other hand, with the increase of grain size, the mechanism of spallation changes from ductile intergranular fracture to quasi-brittle intergranular fracture. Some randomly distributed small metal balls are observed on the fracture surface, which is attributed to the thermal effect due to the serious plastic deformation during the growth and coalescence of micro-voids.
- grain size,
- spall strength,
- damage evolution,
- high-purity aluminum plate

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References

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