Precipitation behavior of an Al–Cu alloy during isothermal aging at low temperatures

Son, S. K.; Takeda, M.; Mitome, Masanori; Bando, Yoshio; Endo, T.

doi:10.1016/j.matlet.2004.10.058

Cited by 193 publications

(64 citation statements)

References 13 publications

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“…Faulted dislocation loops with a Burgers vector of a/2 ⟨110⟩ were reported for temperatures below 300°C in previous neutron-irradiation studies [17]. Molecular dynamic simulations previously showed that this latter type of dislocation loop has a relatively high formation energy and become unstable at high temperatures [33].We found that the increase in irradiation temperature from 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 9 precipitates correspond to different stages of hardening during aging [39]. Therefore, the initial Ti-vacancy clusters, the monolayer platelet reported in this work, and the multilayer TiO-type precipitates characterize different stages of radiation-induced precipitation hardening in the V-4Cr-4Ti alloy.…”

Section: ) Direct Comparison With the Results Of Neutron-irradiatiomentioning

confidence: 70%

Monolayer-thick TiO precipitation in V-4Cr-4Ti alloy induced by proton irradiation

et al. 2017

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We have characterised to atomic resolution the mono-layer thick TiO-type precipitate induced by proton irradiation in V-4Cr-4Ti alloy at the coarsening radiation-induced interstitial a/2⟨111⟩ dislocation loops expected to exert a minimal effect on the precipitate formation. This monolayer-thick precipitate constitutes an early stage in the radiationinduced aging process of V-4Cr-4Ti at low temperatures, and can potentially absorb additional light elements in reactor environments. 1Moor Row, November 24, 2016 Dear Prof. Beyerlein, Please find attached the resubmitted manuscript SMM-16-1716 entitled 'Monolayer-thick TiO precipitation in V-4Cr-4Ti alloy induced by proton irradiation' which has been significantly revised on the basis of the comments received by the reviewers.The detailed response to the reviewers' comments, together with the revised version of the manuscript, is attached. We would like to thank the reviewers for their time and effort in appraising the manuscript. The comments received were pertinent and helpful in improving the manuscript. All the points raised have been addressed and the manuscript has been amended accordingly. We believe that the revisions made adequately address the points raised and should therefore present no further obstacle to publication. We thank the reviewers for carefully reading the manuscript and the useful comments. We have addressed all those comments, which we feel have improved the article's quality.Detailed response:1.) In figure 2, images for SA and SACW irradiated at 350C are necessary for better understanding of temperature effects. We have included additional text in the manuscript about the temperature effect. The novelty and impact of this work lies in the recovery of the CWed structure already at 300°C (Fig. 2) before the formation of monolayer-thick RIPs at 350°C (Fig. 3). 2.) What is the relationship between the observed microstructure and the hardness? For example, for SA irradiated at 300C and 350C, where does the difference in hardening come?We have added some text to clarify the observed hardening behaviour at different temperatures in terms of the observed microstructure. 3.) As the observed RIPs in this study is platelet, the description as "average size" may mislead.We have changed the average size of the monolayer-thick RIPs by their average length. 4.) The description about recovery of the pre-existing dislocation network in SACW is contradicting in page 6 and page 7.We have clarified the contradiction in page 6 and 7. 5.) Direct comparison with the results of neutron-irradiation might be difficult since the damage rate is exceedingly large.We have added some text about the difference in dose rate and particle fluence between neutron and proton irradiation. The formation and evolution of a/2 ⟨111⟩ unfaulted dislocation loops in our proton irradiated samples correspond to the observations reported in neutron-irradiated material. However the average loop size at 350C in the proton irradiated samples (85nm) is lower than the value repo...

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Section: ) Direct Comparison With the Results Of Neutron-irradiatiomentioning

confidence: 70%

Monolayer-thick TiO precipitation in V-4Cr-4Ti alloy induced by proton irradiation

et al. 2017

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“…After passing over the plateau, the curve again increased until it attained a peak hardness in the third stage after aging for 3:0 Â 10 7 s. In the fourth stage, the HV hardness decreased with aging time. Figure 2 shows the DSC curves with endothermic reactions that are attributed to the dissolution of metastable phases in an Al-1.94 at%Cu specimen aged at 373 K. Systematic DSC measurements at various times up to 3:0 Â 10 7 s revealed the existence of three endothermic peaks in the DSC thermograms under 550 K. From the interpretation in previous papers, [5][6][7] we concluded that the first endothermic peak corresponds to the dissolution of solute clusters, the second to G.P. (I) dissolution, and the third to G.P.…”

Section: Methodsmentioning

confidence: 62%

“…Since it was clarified in previous reports by the present authors [5][6][7] that four types of metastable phase precipitates are formed before the intermediate 0 phase formation, we have adopted a new interpretation of the precipitation sequence in an Al-Cu alloy: supersaturated solid solution (ssss) ! solute clusters !…”

Section: Methodsmentioning

confidence: 99%

“…(II) and the 00 phase have slightly different thermal stabilities, and thus the two particles should be considered as two different metastable phases. [4][5][6][7] Apart from the dispute over the stability of metastable phases, it is also recognized that the size distribution and density of precipitates, as well as the characteristics of the precipitate phases, significantly influence the properties of precipitationhardening alloys. Therefore, the quantitative study of the precipitation process is regarded as another important direction to conduct from both the experimental and theoretical points of view.…”

Section: Introductionmentioning

confidence: 99%

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A Quantitative Study of Precipitation of Metastable Phases in an Al-1.94 at%Cu Alloy during Isothermal Aging at 373 K

et al. 2006

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Precipitation behavior of metastable phases in an Al-1.94 at%Cu alloy during isothermal aging at 373 K was investigated by means of Vickers microhardness tests, DSC measurements and TEM observations. The size distribution of the precipitates was quantitatively investigated based on the TEM, HRTEM and HAADF-STEM images, and statistical parameters that fit the precipitate size distribution were determined under a log-normal distribution approximation. We have successfully estimated the volume fraction of copper in precipitates, and found that the G.P.(II) formation results in increases of volume fraction of metastable particles, mean size and hardness.

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“…In particular, the concomitant presence of both copper and magnesium in Al-Si-Cu-Mg alloys should in fact enable the precipitation of more stable Cu-based intermetallic precipitates at higher temperatures, leading to enhanced thermal stability of the T6 heat-treated alloys [10]. In addition to β' (Mg 2 Si) and θ' (Al 2 Cu) precipitates, present in ternary Al-Si-Mg and Al-Si-Cu alloys [10][11][12][13][14][15], reinforcing compounds such as the S' phase (Al 2 CuMg) [14,16,17] and the Q' phase (whose general stoichiometry is Al 5 Cu 2 Mg 8 Si 6 ) are found in quaternary Al-Si-Cu-Mg alloys. In this context, many studies attested that improvement in strength is achieved at the expense of elongation [3,10]; others, instead, reported an increase in high-temperature strength due to the addition of Cu up to 0.5 wt.%, without loss of ductility [18,19].…”

Section: Introductionmentioning

confidence: 99%

How Slight Solidification Rate Variations within Cast Plate Affect Mechanical Response: A Study on As‐Cast A356 Alloy with Cu Additions

Giovanni

Cerri

Saito

et al. 2018

Advances in Materials Science and Engineering

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e present work investigates a narrow range of secondary dendrite arm spacing (SDAS), in an as-cast A356 alloy with and without copper (Cu) additions. Cu was added to the base A356 alloy melt to reach the target concentration of 0.5 and 1 wt.%. Samples were selected from 3 different positions within the cast plate, offering 30, 35, and 40 μm SDAS variants. Tensile curves revealed a strong influence between the specimen cutting position and strength, with a pronounced effect in the Cu-containing alloys. Hardness measurements did not confirm the tensile response; hence, to understand the phenomenon, microstructural features have been investigated in detail. Eutectic silicon (Si) particle equivalent diameter (ED) size decreased from the top (T) to the bottom (B) position of the cast. Eutectic Si particle surface area (A%) was found to be denser at the B as compared to the T and simultaneously in the Cu-containing alloy as compared to the Cu-free reference alloy. Backscattered electron (BSE) images were employed to investigate the nature of the Cu-rich intermetallic phases. In conclusion, electrical conductivity measurements were performed to confirm the trends observed.

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Precipitation behavior of an Al–Cu alloy during isothermal aging at low temperatures

Cited by 193 publications

References 13 publications

Monolayer-thick TiO precipitation in V-4Cr-4Ti alloy induced by proton irradiation

Monolayer-thick TiO precipitation in V-4Cr-4Ti alloy induced by proton irradiation

A Quantitative Study of Precipitation of Metastable Phases in an Al-1.94 at%Cu Alloy during Isothermal Aging at 373 K

How Slight Solidification Rate Variations within Cast Plate Affect Mechanical Response: A Study on As‐Cast A356 Alloy with Cu Additions

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