GP zones and precipitate morphology in aged Al-Mg alloys

Bouchear, M.; Hamana, D.; Laoui, Tahar

doi:10.1080/01418619608243010

Cited by 51 publications

(16 citation statements)

References 12 publications

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“…In sensitized Al‐Mg alloys, rearrangement of dislocations and dislocation substructures due to the transformation from single phase α to equilibrium β‐phase are mainly responsible for the reorientation of the grain structure . Additionally, prolonged annealing or sensitization provides suitable temperature and time for the solute atoms to redistribute themselves through phase transformation near grain boundaries as well as filling of lattice vacancies throughout the grains; hence, reorientation of grain size is inevitable . It is noticeable that microstructural images presented in Figure C,D are for SENS50 and SENS75 samples taken at the same magnification, ie, 20× of the optical microscope.…”

Section: Resultsmentioning

confidence: 99%

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Kumar

Singh

2019

Fatigue Fract Eng Mat Struct

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In the present study, fatigue and fracture characteristics of sensitized marine grade Al‐Mg (AA 5754) alloy are experimentally evaluated. Received alloy is sensitized at temperatures of 150°C (SENS50) and 175°C (SENS75) for 100 hours. Fracture parameters, KIc and JIc, are experimentally evaluated. Slow strain rate tensile tests at a crosshead speed of 0.004, 0.006, and 0.01 mm/min; fatigue crack growth tests at load ratios (R = Pmin/Pmax) of 0.1, 0.2, and 0.5; and low cycle fatigue tests at four strain amplitudes of (0.3‐0.6)% are performed for SENS50 and SENS75 alloys. Relatively lower magnitude of fracture toughness values are observed for SENS75 specimen. Severe degradation in tensile properties, fatigue crack growth characteristics, and low cycle fatigue lives are observed for SENS75 samples. Extended finite element method is adopted to simulate the elasto‐plastic crack growth during fracture toughness evaluation. Scanning electron microscopy (SEM) is used to understand the failure mechanism of sensitized alloys.

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Section: Resultsmentioning

confidence: 99%

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Kumar

Singh

2019

Fatigue Fract Eng Mat Struct

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“…The nucleation of the phase (Al 3 Mg 2 ) has been studied by a number of researchers. 3,6,20) They have suggested from TEM observations that the phase is preferentially formed either at the interphase boundary between the intermediate 0 phase and aluminium matrix, or at matrix grain boundaries or on dislocations within the matrix. This clearly implies that the intermediate 0 particles…”

Section: Discussionmentioning

confidence: 99%

Observation of Beta Phase Particles in an Isothermally Aged Al-10 mass%Mg Alloy with and without 0.5 mass%Ag

Kubota

2008

Mater. Trans.

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Characterization of the 0 and precipitate phases formed in the aged Al-10 mass%Mg alloy with and without 0.5 mass%Ag at 200 C and 240 C has been carried out using TEM. The plate-like precipitate particles were formed in binary alloys aged from 2 h at 200 C. The plate-like particles had habit planes of f100g , and were identified as the 0 phase. Whereas the very fine scale, uniformly distributed precipitate particles with a spherical shape were formed as the dominant precipitate particle in ternary alloy aged at 200 C for periods of 4 h and 6 h. These small spherical particles were identified to be icosahedral phase while no icosahedral phase was observed in the Ag-free alloys when samples were aged at 200 C. Formation of a precipitate cluster consisting of two distinguishable parts has been observed in binary alloys aged 5 h at 240 C, and these precipitate particles were identified as the equilibrium and metastable 0 phases. Whereas a higher volume fraction of dispersed precipitate phases which comprised a mixture of a coarse-scale, rod-like particles and blocky particles, was observed in ternary alloy aged 5 h at 240 C. With further increase of ageing time up to 24 h at 240 C, the microstructure contained a high volume fraction of coarse-scale, globular precipitate particles, together with a secondary distribution of fine-scale spheroidal precipitates, these coarse globular particles were identified to be the equilibrium phase.

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“…The Mg 2 Al 3 has three structures: noncoherent stable phase ȕ (FCC), semicoherent intermediate ȕƍ (hexagonal) and completely coherent ȕƍƍ (GP zone) [15]. The ȕƍƍ-and ȕƍ-Mg 2 Al 3 nucleate at defects such as dislocations and vacancies and are easy to stretch into thin flakes [16,17]. The crystallization of Į-Al dendrites is easy to introduce such defects in the Al matrix due to the rapid solidification.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and Mechanical Properties of As-cast 5182 Aluminum alloy Modified with Al-RE and Al-5Ti-1B Master Alloys

2016

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Abstract. The modification effects of Al-RE (rare earth) and Al-5Ti-1B master alloys on the microstructure and mechanical properties of as-cast 5182 aluminum alloys were studied. Experimental results show that both of the modifications refine the Į-Al grains and the Mg 2 Si and (FeMn)Al 6 eutectics. The Mg 2 Al 3 phases exist in the forms of thin flake (ȕƍ-Mg 2 Al 3 ) and small granule (ȕ-Mg 2 Al 3 ) for the unmodified 5182 aluminum alloy. Modifications with 0.1 wt% Al-5Ti-1B and 0.2 wt% Al-RE yield longer flakes of ȕƍ-Mg 2 Al 3 and small amounts of ȕ-Mg 2 Al 3 granules. The other contents of the modifiers reduce the longer flakes of ȕƍ-Mg 2 Al 3 but facilitate formation of the particles and islands of ȕ-Mg 2 Al 3 . The 0.2 wt% of Al-RE modification yields the finest microstructure and the largest ductility; the 0.2 wt% of Al-5Ti-1B modification has better microstructure and the highest tensile strength.

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GP zones and precipitate morphology in aged Al-Mg alloys

Cited by 51 publications

References 12 publications

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Investigation of fatigue and fracture behaviour of sensitized marine grade aluminium alloy AA 5754

Observation of Beta Phase Particles in an Isothermally Aged Al-10 mass%Mg Alloy with and without 0.5 mass%Ag

Microstructure and Mechanical Properties of As-cast 5182 Aluminum alloy Modified with Al-RE and Al-5Ti-1B Master Alloys

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