Dataset Information

Nano-scale characterisation of sheared ?" precipitates in a deformed Al-Mg-Si alloy.

ABSTRACT: This paper compares the nano-scale structure of ?" precipitates in a peak-aged Al-Mg-Si alloy before and after deformation. Three complementary advanced transmission electron microscopy techniques are used to reveal the structures and elucidate the interaction between dislocations and ?" precipitates. We show that the needle-like and semi-coherent ?" precipitates are sheared several times on different planes by dislocations during deformation, with no indications that they are bypassed or looped. Our results show that dislocations cut through precipitates and leave behind planar defects lying on planes inclined to ?100? directions inside the precipitates. The results also indicate that precipitates are sheared in single steps, and the implication of this observation is discussed in terms of slip behaviour.

SUBMITTER: Christiansen E

PROVIDER: S-EPMC6877512 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Nano-scale characterisation of sheared β" precipitates in a deformed Al-Mg-Si alloy.

Christiansen Emil E Marioara Calin Daniel CD Holmedal Bjørn B Hopperstad Odd Sture OS Holmestad Randi R

Scientific reports 20191125 1

This paper compares the nano-scale structure of β" precipitates in a peak-aged Al-Mg-Si alloy before and after deformation. Three complementary advanced transmission electron microscopy techniques are used to reveal the structures and elucidate the interaction between dislocations and β" precipitates. We show that the needle-like and semi-coherent β" precipitates are sheared several times on different planes by dislocations during deformation, with no indications that they are bypassed or looped ...[more]

PMID: 31767885

Similar Datasets

Project description:Al-Mg-Si series aluminum alloy is a heat-treatment-strengthened alloy. Research on the impact resistance of Al-Mg-Si series aluminum alloy is of great significance to expand its application in engineering. Taking 6082-T6 aluminum alloy as the concrete research object, using the split Hopkinson pressure bar (SHPB) device, the dynamic mechanical response of the material under different temperatures and average strain rates was studied, and the service performance of the material under extreme conditions was determined. The absolute temperature rise was introduced to optimize the existing constitutive model. The results show that when the environment temperature is 298.15~473.15 K under high-speed impact, the internal thermal softening effect of the material is dominant in the competition with the work hardening, resulting in a decrease in the flow stress of the material. Through the analysis of the real stress-strain curve, it was found that the elastic modulus of the material was negatively correlated with the strain rate, negatively correlated with the temperature, and showed an obvious temperature-softening effect. Yield strength was negatively correlated with temperature and positively correlated with strain rate, which showed an obvious strain rate hardening effect. Based on SEM microscopic analysis, it was found that under given conditions, adiabatic shear bands appeared in some samples, and their internal structures demonstrated obvious change. It was judged that when high-speed impact occurs, cracks are induced at the shear bands, and the cracks will continue to develop along the adiabatic shear bands, resulting in many oblique cracks which will gradually become larger and eventually lead to material failure. Finally, based on the model, the strain rate and temperature softening terms were improved, and a rise in adiabatic temperature rise was introduced. The improved model can better describe the strain rate effect of the material and accurately describe its flow stress. It provides a theoretical basis for the engineering application of materials.

Dataset Information

Nano-scale characterisation of sheared ?" precipitates in a deformed Al-Mg-Si alloy.

Publications

Nano-scale characterisation of sheared β" precipitates in a deformed Al-Mg-Si alloy.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets