Precipitation behavior and change of yield strength during artificial aging in Al-Zn-Mg-Cu alloys.

光造, 長村; 庄治郎, 落合; 利弘, 上原

doi:10.2464/jilm.34.517

Cited by 18 publications

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“…It is noteworthy that the À value of 200$230 mJÁm À2 was reported for the case of cobalt precipitates in Cu-Co alloys. 1) For the specimen of S 1 , the obtained value of 62 MPa is found to be close to the experimental value. It is supposed that the longest aged specimen of S 3 which indicates the maximum strength is in the transitional state between the mechanism of particle cutting and the Orowan mechanism.…”

Section: Theory Of Precipitation and The Present Resultssupporting

confidence: 75%

“…Osamura et al 1) analyzed both mechanisms using the theory of particle cutting by Brown and Ham 8) and the Orowan hypothesis by Hirsch and Humphreys 9) for their experimental results. It was found that the particle size in this polycrystalline alloy will be about 2 nm under aging at 393 K for 120 ks, where the largest yield stress is achieved.…”

Section: Theory Of Precipitation and The Present Resultsmentioning

confidence: 99%

“…Equation (1) allows us to estimate the increase of critical resolved shear stress (CRSS) of Á( due to the precipitation. Since the " " values of 0.73, 1.36 and 1.76 nm were found for 7475 polycrystalline alloys by Osamura et al, 1) they were adopted for the specimens of S 1 , S 2 and S 3 , respectively. Furthermore, the l p values of the distance between particles in these specimens were similarly adjusted to equal 8.83, 12.1 and 14.2 nm for the polycrystals taken from the data by Osamura et al 1) The obtained values of Á( are 52, 134 and 154 MPa for the specimens of S 1 , S 2 and S 3 , respectively.…”

Section: Theory Of Precipitation and The Present Resultsmentioning

confidence: 99%

“…It is already widely recognized that the considerable improvement in strength of aluminum alloys can be achieved by precipitation hardening, as several demonstrations Osamura et al, 1) Kovács et al 2) and Poole et al 3) have shown. They investigated the relationship between the duration of the aging treatment and mechanical properties of polycrystalline 7000-type aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

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Hardness and Stress-Strain Curves of Al-Zn-Mg-Cu Alloy Single Crystals

et al. 2008

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The present paper describes the variations of the mechanical properties of Al-Zn-Mg-Cu alloy single crystals with various aging times. The cylindrical single crystals of 7475 aluminum alloys were produced at 1033 K by the Bridgeman method, where the composition of initial material and the shape of carbon mold were modified for the growth of quaternary crystals. The specimens proper for tensile and hardness testing were obtained from the single crystal rod homogenized at 823 K for 900 ks using spark-cutting method. Subsequently, they were aged at 393 K for 3.6, 86.4, 900 and 2880 ks after quenching in ice water from 773 K. In the stress-strain curves of the alloy single crystals, the increase of yield stress and the decrease of elongation with an increase of aging time are seen together with a decrease in the rate of work hardening. Moreover, some serrations occur especially in the final plastic stage on the curves. Hardness of the alloy single crystals agrees with those of polycrystals due to the occurrence of multiple slips during loading. However, the alloy single crystals exhibit a marked decrease of yield strength in comparison with the polycrystals, which results from a single glide occurring in the single crystals. If we compare the increase of critical resolved shear stress (CRSS) derived from two kinds of theories of precipitation with the experimental value, both of them are roughly in agreement except for the specimen aged for 3.6 ks. The obtained results indicate that the maximum strength of Al-Zn-Mg-Cu alloy single crystals is achieved in the transitional process between the mechanism of particle cutting and the Orowan mechanism.

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Section: Theory Of Precipitation and The Present Resultssupporting

confidence: 75%

Section: Theory Of Precipitation and The Present Resultsmentioning

confidence: 99%

Section: Theory Of Precipitation and The Present Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hardness and Stress-Strain Curves of Al-Zn-Mg-Cu Alloy Single Crystals

et al. 2008

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“…It is known that ©A strengthens AlMgZn alloys the most. 24,29,31,32) Therefore, the increase in hardness with aging time could be caused by either the coarsening of the G.P. Zone or the transformation into ©A.…”

Section: Local Precipitates Within Interdiffusion Layersmentioning

confidence: 99%

Nanostructure Distribution and Strengthening Mechanisms in the Interface Regions of Al–Zn/Al–Mg Multilayered Composites

et al. 2021

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In this study, we examined the distribution of nanostructures in the interdiffusion layer of AlMg/AlZn/AlMg multilayer composites with different layer width via microbeam small-angle X-ray scattering (SAXS) measurements and direct observation using transmission electron microscopy (TEM). The changes in scattering profiles across the graded interfacial layers reflected the spatial change in the volume fraction, average size of precipitates, and their distribution in the sample. Microstructural parameters obtained from the SAXS analysis were used to explain the local hardness change in the interface area. Within the single interdiffusion layer of AlZnMg alloy, both of the Orowan and cutthrough mechanisms were observed. TEM imaging was used with the same projection of SAXS to analyze the various shapes of the precipitates to explain the anisotropy in the 2-dimensional scattered intensity measured via SAXS. The present results revealed the spatial distribution of nanostructures with averaged parameters and explained the local mechanical properties within the interface region of the multilayer composite sheets.

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Initial Age Hardening and Nanostructural Evolution in a Cu‐Ni‐P Alloy

Aruga

2012

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Precipitation behavior and change of yield strength during artificial aging in Al-Zn-Mg-Cu alloys.

Cited by 18 publications

References 0 publications

Hardness and Stress-Strain Curves of Al-Zn-Mg-Cu Alloy Single Crystals

Hardness and Stress-Strain Curves of Al-Zn-Mg-Cu Alloy Single Crystals

Nanostructure Distribution and Strengthening Mechanisms in the Interface Regions of Al–Zn/Al–Mg Multilayered Composites

Initial Age Hardening and Nanostructural Evolution in a Cu‐Ni‐P Alloy

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