Stress-oriented nucleation of ω-phase plates in an Al-Cu-Mg-Ag alloy

Muraishi, Shinji; Kumai, Shinji; Sato, Akira

doi:10.1080/01418610208239608

Cited by 20 publications

(4 citation statements)

References 17 publications

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“…It should be noted that orientations and shapes of precipitation variants are correlated with types of misfit strains, because the nucleation and growth of the precipitates take place in order to minimise their strain energy: biaxial misfit strains along transverse directions of <001> rods in Al-Mg-Si alloys [9][10][11], large negative misfit strains normal to {001}GP-zones and θ plates in Al-Cu alloys [12,13], {111} Ω plates in Al-Cu-Mg-Ag alloys [14,15], etc. It is interesting to note that under external stress during ageing treatment, the stress orienting effect of precipitation variants occur due to the interaction energy between the external stress and the misfit strain [16][17][18]. By applying the stress ageing method, strengthening by single-variant GP-zones in stress aged Al-Cu single crystals was experimentally determined by Eto [19] and Muraishi et al [20].…”

Section: Introductionmentioning

confidence: 99%

Orientation Dependent Hardening by <001> Rod-Shaped Misfitting Precipitates in Aluminium Alloys

Liu

Muraishi

2022

Materials

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A coherent precipitate formed in a metallic alloy is of importance in its strengthening mechanism, owing to dislocation/precipitate interaction. Therefore, the present study investigated the effect of <001> rod-shaped precipitates on misfit hardening in aluminium alloys by means of parametric dislocation dynamics simulation based on Green’s function method. The simulation results revealed that the topological evolution of the dislocation microstructure is greatly influenced by local internal stress around the <001> rod precipitate. The strong orientation dependence of misfit hardening was observed for the gradients of the stress–strain curves and their maximum shear stresses, where the difference in the maximum stress values amounted to 30%. The strong and weak hardening behaviours associated with the internal stress of <001> rod precipitates were implemented in terms of the energy associated with the dislocation motion.

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Section: Introductionmentioning

confidence: 99%

Orientation Dependent Hardening by <001> Rod-Shaped Misfitting Precipitates in Aluminium Alloys

Liu

Muraishi

2022

Materials

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“…(3), because all the three {001} variants are equivalent to the stress along [111] direction. From the experimental data of stress-oriented plates, 4) the number density of stress-promoted variant (N promoted ) was found to be twice that of the other suppressed variant (N suppressed ). Namely, consequently described as,…”

Section: Stress Effects On the Number Density Of {111} mentioning

confidence: 99%

“…Previously we have reported the preferential nucleation of plates under external stress, nevertheless, stress effects on the nucleation and growth of GP zones and 0 , which concurrently exists with , have been uncertain. 4) The stress effect for GP zones has been examined by Eto.…”

Section: Introductionmentioning

confidence: 99%

Competitive Nucleation and Growth of {111} Ω with {001} GP Zones and θ′ in a Stress-Aged Al-Cu-Mg-Ag Alloy

2004

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The stress aging method was conducted for an Al-Cu-Mg-Ag polycrystalline alloy to study the competitive nucleation and growth behavior of GP zones, 0 and precipitates concurrently existing on different {001} and {111} habit planes. After initial stress aging for 1 h, the preferential nucleation of GP zones against occurred irrespective of the stress direction applied to the grains. With increasing aging time, the density of increased while the GP zones decreased in number to dissolve into the matrix, resulting from competitive nucleation due to the mutual constituent of Cu in GP zones and . With further stress aging, the growth of 0 plates was enhanced in comparison with the growth of plates. The relative number density change between {001} and {111} precipitates was emphasized especially in grains with the stress direction along [001], which indicated that nucleation and growth of GP zones and 0 plates were highly sensitive to external stress compared with that of . HREM observation found that low amounts of small plates were nucleated during the initial stress aging indicating retarded nucleation. Two-step aging (stress aging for 1 h followed by the stress-free aging) revealed that preferentially nucleated GP zone against during the initial stress aging determined the successive precipitation sequence of the precipitation of and 0 .

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“…6) The addition of Ag to Al-Cu-Mg alloy system with a high Cu/Mg ratio increases significantly the mechanical properties and it decreases the effect of the overaging, material degradation.…”

Section: Introductionmentioning

confidence: 99%

Hardening Behavior in Aged Al-4%Cu-0.3%Mg Alloys with 0.5 and 2%Ag Additions

Palmerín¹,

Dorantes-Rosales²,

Hirata³

et al. 2009

Mater. Trans.

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The precipitation characterization of Al-4 mass% Cu-0.3 mass% Mg alloy with additions of 0.5 and 2 mass% Ag during aging treatments was carried out by transmission electron microscopy (TEM) and microhardness measurements. TEM observation of aged samples showed that the phase is the dominant phase and it is in coexistence with the 0 phase. Additionally, the phase has the morphology of polygonal prism (almost hexagonal) with flat interfaces and a thin thickness. The variation of the cube of mean radius of precipitates, r 3 , followed a linear relationship, as predicted by the Lifshitz, Slyosov and Wagner (LSW) theory for diffusion-controlled coarsening in both alloys. The coarsening process of the phase was slower in the aged Al-4 mass% Cu-0.3 mass% Mg-2 mass% Ag alloy. The decrease in hardness seems to be related to the coarsening of the phase and the loss of coherency.

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Stress-oriented nucleation of ω-phase plates in an Al-Cu-Mg-Ag alloy

Cited by 20 publications

References 17 publications

Orientation Dependent Hardening by <001> Rod-Shaped Misfitting Precipitates in Aluminium Alloys

Orientation Dependent Hardening by <001> Rod-Shaped Misfitting Precipitates in Aluminium Alloys

Competitive Nucleation and Growth of {111} Ω with {001} GP Zones and θ′ in a Stress-Aged Al-Cu-Mg-Ag Alloy

Hardening Behavior in Aged Al-4%Cu-0.3%Mg Alloys with 0.5 and 2%Ag Additions

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Stress-oriented nucleation of ω-phase plates in an Al-Cu-Mg-Ag alloy

Cited by 20 publications

References 17 publications

Orientation Dependent Hardening by <001> Rod-Shaped Misfitting Precipitates in Aluminium Alloys

Orientation Dependent Hardening by <001> Rod-Shaped Misfitting Precipitates in Aluminium Alloys

Competitive Nucleation and Growth of {111} &Omega; with {001} GP Zones and &theta;&prime; in a Stress-Aged Al-Cu-Mg-Ag Alloy

Hardening Behavior in Aged Al-4%Cu-0.3%Mg Alloys with 0.5 and 2%Ag Additions

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Competitive Nucleation and Growth of {111} Ω with {001} GP Zones and θ′ in a Stress-Aged Al-Cu-Mg-Ag Alloy