Effect of aging on scale-dependent plasticity in aluminum alloy 2024. Ro, Y. J.; Begley, M. R.; Gangloff, R. P.; and Agnew, S. R. Materials Science and Engineering: A, 435–436:333–342, November, 2006.
Effect of aging on scale-dependent plasticity in aluminum alloy 2024 [link]Paper  doi  abstract   bibtex   
The effect of aging on strain-gradient plasticity (SGP) in aluminum alloy 2024 is quantified using nanoindentation. The measured hardness decreases with increasing depth for all conditions; however, the characteristic depth over which the decrease occurs changes. An indentation model which incorporates SGP correlates for penetration depths greater than ∼300 nm, and enables estimation of material length scale ( ℓ * ) that is a constitutive parameter in gradient plasticity theory. This ℓ * is 50–200 nm for alloy 2024, increasing through a maximum with increasing artificial aging time, and is always smaller than values obtained for pure metals. It is suggested that the specific ℓ * values depend on dislocation interactions with atomic clusters through precipitates produced by artificial aging. The implication of the measured values of ℓ * , and other constitutive parameters, on the stress elevation at crack tips in ductile materials is briefly discussed.
@article{ro_effect_2006,
	title = {Effect of aging on scale-dependent plasticity in aluminum alloy 2024},
	volume = {435–436},
	issn = {0921-5093},
	url = {http://www.sciencedirect.com/science/article/pii/S0921509306014432},
	doi = {10.1016/j.msea.2006.07.102},
	abstract = {The effect of aging on strain-gradient plasticity (SGP) in aluminum alloy 2024 is quantified using nanoindentation. The measured hardness decreases with increasing depth for all conditions; however, the characteristic depth over which the decrease occurs changes. An indentation model which incorporates SGP correlates for penetration depths greater than ∼300 nm, and enables estimation of material length scale ( ℓ * ) that is a constitutive parameter in gradient plasticity theory. This ℓ * is 50–200 nm for alloy 2024, increasing through a maximum with increasing artificial aging time, and is always smaller than values obtained for pure metals. It is suggested that the specific ℓ * values depend on dislocation interactions with atomic clusters through precipitates produced by artificial aging. The implication of the measured values of ℓ * , and other constitutive parameters, on the stress elevation at crack tips in ductile materials is briefly discussed.},
	urldate = {2016-02-26},
	journal = {Materials Science and Engineering: A},
	author = {Ro, Y. J. and Begley, M. R. and Gangloff, R. P. and Agnew, S. R.},
	month = nov,
	year = {2006},
	keywords = {Aluminum alloy, Clustering, Fracture, Non-local plasticity, Precipitation, Strain-gradient plasticity},
	pages = {333--342},
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}
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