Identification of Mn-dispersoid in Al-Zn-Mg-Mn alloy

Kong, Byeong Seo; Suk, Jin Ik; Nam, Soo Woo

doi:10.1007/bf00274597

Cited by 12 publications

(8 citation statements)

References 4 publications

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“…The two identical orientation relationships derived by Kusumoto & Ohta (1954), Kong & Nam (1996) and Kong et al (1996) very well accord with the results of case (i) of the present study ( Fig. 8a), which evidently substantiates the occurrence of this orientation relationship.…”

Section: Orientation Relationship Of the Plate-like Precipitatessupporting

confidence: 91%

“…8). In that context it has to be noted that Kusumoto & Ohta (1954), Nagahama et al (1971), Kong & Nam (1996) and Kong et al (1996) used a different de®nition of the orthorhombic Al 6 Mn phase with the a and b axes being exchanged. Thus, for a comparison with the present results, the corresponding orientation relations of the literature had to be transformed into the present coordinate system.…”

Section: Orientation Relationship Of the Plate-like Precipitatesmentioning

confidence: 99%

“…For rhomboidal precipitates no special orientation relationship was found. Kong & Nam (1996) and Kong et al (1996) observed Al 6 Mn dispersoids with different aspect ratios in an Al±Zn±Mg±Mn alloy and found that they all had the orientation relationship (2 Å 13) m ||(010) p , [03 Å 1] m ||[100] p with the matrix. During the current investigation on Al±1.3 wt% Mn, several orientation relationships between the plate-like particles and the matrix have been observed; the very regular arrangement of the rhomboidal particles in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Orientation relationship between Al₆Mn precipitates and the Al matrix during continuous recrystallization in Al–1.3%Mn

1999

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Annealing of cold‐rolled supersaturated Al–1.3 wt% Mn leads to heavy precipitation of fine particles on the as‐deformed microstructure. Depending on the crystallographic orientation of the deformed matrix grains, particles with different morphologies, namely spherical, rhomboidal and plate‐like, have been observed. This variation in morphology could be traced back to differences in local misorientation caused by different dislocation substructures in different matrix orientations. Microstructural investigations and selected‐area diffraction (SAD) analysis in a transmission electron microscopy (TEM) study were employed to characterize the various particles and to determine their orientation relationship to the Al matrix. Independent of the particle morphology, most Mn precipitates were identified as Al6Mn; only occasionally was Al12Mn observed. Upon consideration of the various crystal symmetries, two different orientation relationships were discerned, which can be written as (110)m||(111)p, [001]m||[2¯11]p and (110)m||(111)p, [11¯2]m||[12¯1]p. These orientation relationships are discussed with respect to the existence of several low misfits of lattice spacings and compared to literature data.

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Section: Orientation Relationship Of the Plate-like Precipitatessupporting

confidence: 91%

Section: Orientation Relationship Of the Plate-like Precipitatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Orientation relationship between Al₆Mn precipitates and the Al matrix during continuous recrystallization in Al–1.3%Mn

1999

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“…These particles form thin plates due to very good coincidence site matching between lattice points in (0 0 1)p and (3 −1 5)m planes in selected orientation relations [56]. The average thickness of the Al6(Mn,Fe) for the present alloys is obtained using the latter data by Li et al [56] and coarsening data in Kong et al [57] (showing the activation energy for coarsening to be 200 kJ/mol) as 20 nm. Al3Zr particles in unrecrystallised grains are coherent with the matrix and precipitates generally do not nucleate on them (e. g. [3,23]).…”

Section: The Reactions During the Quenchmentioning

confidence: 92%

Predicting the quench sensitivity of Al–Zn–Mg–Cu alloys: A model for linear cooling and strengthening

et al. 2015

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In this work the quench sensitivity of Al-Zn-Mg-Cu alloys is studied through continuous cooling at constant rates of a range of alloys using differential scanning calorimetry (DSC), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and hardness testing. The DSC, TEM and SEM data show that the cooling reactions are dominated by a high temperature reaction (typically ~450 °C down to ~350 °C) due mostly to S-Al2CuMg phase formation, a medium temperature reaction (~350 °C down to ~250 °C) due predominantly to -Mg(Al,Cu,Zn)2 phase formation and a lower temperature reaction (~250 °C down to ~150 °C) due to a Zn-Cu rich thin plate phase. A new, physically-based model is constructed to predict rates of all reactions, enthalpy changes and resulting yield strength in the artificially aged condition. The model incorporates a recently derived model for diffusion-controlled reactions based on the extended volume fraction concept as well as recent findings from first principles modelling of enthalpies of the relevant phases. The model shows a near perfect correspondence with data on all 6 alloys studied extensively by cooling DSC and hardness testing, and 2 allows prediction of the influence of the 3 major elements and 3 dispersoid forming elements on quench sensitivity. Graphical abstract Highlights

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“…In light of the increasing effort devoted to electrodeposition from non-aqueous baths, in particular ionic liquid baths, it is of interest to understand whether similar alloy nanostructures can be produced from those media. Ionic liquid deposition has received considerable attention due to the low volatility, low flammability, and low toxicity of the electrolyte, as well as the wide electrochemical window properties seen in some systems [28][29][30][31][32][33][34][35]. These unique properties enable the deposition of low reduction potential metals such as aluminum, magnesium and titanium at moderate temperatures, or even semiconductors and compounds, [36,37] without concern for hydrogen evolution.…”

Section: Introductionmentioning

confidence: 99%

Grain boundary segregation in Al–Mn electrodeposits prepared from ionic liquid

et al. 2015

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Among the various preparation methods for nanocrystalline alloys, ionic liquid electrodeposition at low temperature is of interest for its scalability and efficiency. To achieve nanostructures with stabilized structures, it is desirable to directly deposit alloys in which the grain boundaries are decorated with a segregated alloying element. Here a combination of atom probe tomography and aberration corrected scanning transmission electron microscopy are used to confirm that in Al-Mn nanocrystalline alloys deposited from an ionic liquid, Mn is slightly segregated at grain boundaries in the as-deposited condition. The apparent heat of grain boundary segregation is calculated to lie between 1100 and 1500 J mol-1 , which aligns reasonably well with a value calculated using a Miedema-based segregation model, and which is also in line with a more refined CALPHAD-type estimation if it is assumed that the Al-Mn deposits are not fully equilibrated at the deposition temperature.

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Identification of Mn-dispersoid in Al-Zn-Mg-Mn alloy

Cited by 12 publications

References 4 publications

Orientation relationship between Al₆Mn precipitates and the Al matrix during continuous recrystallization in Al–1.3%Mn

Orientation relationship between Al₆Mn precipitates and the Al matrix during continuous recrystallization in Al–1.3%Mn

Predicting the quench sensitivity of Al–Zn–Mg–Cu alloys: A model for linear cooling and strengthening

Grain boundary segregation in Al–Mn electrodeposits prepared from ionic liquid

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Identification of Mn-dispersoid in Al-Zn-Mg-Mn alloy

Cited by 12 publications

References 4 publications

Orientation relationship between Al6Mn precipitates and the Al matrix during continuous recrystallization in Al–1.3%Mn

Orientation relationship between Al6Mn precipitates and the Al matrix during continuous recrystallization in Al–1.3%Mn

Predicting the quench sensitivity of Al–Zn–Mg–Cu alloys: A model for linear cooling and strengthening

Grain boundary segregation in Al–Mn electrodeposits prepared from ionic liquid

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Orientation relationship between Al₆Mn precipitates and the Al matrix during continuous recrystallization in Al–1.3%Mn

Orientation relationship between Al₆Mn precipitates and the Al matrix during continuous recrystallization in Al–1.3%Mn