Effects of microstructure and composition on spall fracture in aluminum

Pedrazas, Nicholas A.; Worthington, Daniel L.; Dalton, D. A.; Sherek, Paul A.; Steuck, Sean P.; Quevedo, Hernan; Bernstein, Aaron; Taleff, Eric M.; Ditmire, T.

doi:10.1016/j.msea.2011.12.083

Cited by 59 publications

(25 citation statements)

References 17 publications

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“…It is shown that the spall strength is higher when the strain hardening ability is higher for this HSSS. In a previous research for an Al-3 Mg alloy, 68 the spall strength increases with the increasing grain size when the grain size is below 25 lm. Their observations along with our results indicate that the spall strength is a microstructure dependent parameter of metals under impact tensile conditions.…”

Section: Effect Of the Microstructure On The Shock And Spall Behaviormentioning

confidence: 69%

Shock and spall behaviors of a high specific strength steel: Effects of impact stress and microstructure

Wang

Zhang

Yang

et al. 2017

Journal of Applied Physics

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A series of plate-impact experiments were conducted to investigate the influences of impact stress and microstructure on the shock and spall behaviors of a high specific strength steel (HSSS). The HSSS shows a strong positive strain rate sensitivity on the yield strength. With increasing impact stress up to about 6 GPa, the spall strength is found to decrease significantly and then levels off with further increasing impact stress. This trend is proposed to be attributed to the accumulation damage within the target as the initial shock-induced compression wave propagates through the target. The microcracks are clearly observed to nucleate from the interfaces between γ-austenite and B2 phase and propagate along the interfaces or cut through the B2 phase in the HSSS during the spalling process. The Hugoniot elastic limit and the spall strength were found to be highly dependent on the microstructure. The spall strength was found to be higher when the density of the void nucleation sites is lower, indicating that the spall strength should be a microstructure parameter of the HSSS under impact tensile conditions depending on the density of phase interfaces. It was also found that there is a tradeoff between the specific yield strength and the spall strength for this HSSS; thus, the current findings should provide insights for achieving an optimal combination of both mechanical properties for impact-resistant applications by tailoring the microstructure.

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Section: Effect Of the Microstructure On The Shock And Spall Behaviormentioning

confidence: 69%

Shock and spall behaviors of a high specific strength steel: Effects of impact stress and microstructure

Wang

Zhang

Yang

et al. 2017

Journal of Applied Physics

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“…The fracture will prefer the grain boundaries to spall instead of grains. The similar phenomenon has been investigated from experiment [54]. …”

Section: Numerical Simulationsmentioning

confidence: 81%

Computational modeling and simulation of spall fracture in polycrystalline solids by an atomistic-based interfacial zone model

Lin

Zeng

2015

Engineering Fracture Mechanics

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The focus of this work is to investigate spall fracture in polycrystalline materials under high-speed impact loading by using an atomistic-based interfacial zone model. We illustrate that for polycrystalline materials, increases in the potential energy ratio between grain boundaries and grains could cause a fracture transition from intergranular to transgranular mode. We also found out that the spall strength increases when there is a fracture transition from intergranular to transgranular. In addition, analysis of grain size, crystal lattice orientation and impact speed reveals that the spall strength increases as grain size or impact speed increases.

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“…If the strain rate were orders of magnitude higher, for example, a ballistic rate of the order of 10 6 s −1 , radial fracture would most likely occur. For example, fracture and spalling of pure Al occur at these rates, albeit at larger length scales [27]. Since radial fracture was not possible for this bilayer thickness, the concept of indentation fracture toughness as defined by Equation (2) was not applicable in this case.…”

Section: Resultsmentioning

confidence: 99%

Indentation Fracture Response of Al–TiN Nanolaminates

Mook

Raghavan

Baldwin

et al. 2013

Materials Research Letters

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Supplementary Material Available OnlineIndentation fracture experiments on aluminium-titanium nitride nanolaminates were conducted both inside and outside of a scanning electron microscope (SEM). Remarkably, indentation fracture toughness increases with increasing strength for bilayer thicknesses less than 10 nm. In addition, slower strain rates favour formation of lateral cracking while increasing rates favour formation of radial cracks. SEM movies show that an increase in radial crack length does not occur during the unloading cycle; this is due to flow of aluminium into the cracks during unloading and is a form of self-healing which should be applicable to metal-ceramic nanolaminates in general.

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Effects of microstructure and composition on spall fracture in aluminum

Cited by 59 publications

References 17 publications

Shock and spall behaviors of a high specific strength steel: Effects of impact stress and microstructure

Shock and spall behaviors of a high specific strength steel: Effects of impact stress and microstructure

Computational modeling and simulation of spall fracture in polycrystalline solids by an atomistic-based interfacial zone model

Indentation Fracture Response of Al–TiN Nanolaminates

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