A combination of severe plastic deformation and ageing phenomena in Al–Mg–Si Alloys

Vaseghi, Majid; Kim, Hyoung Seop

doi:10.1016/j.matdes.2011.12.014

Cited by 46 publications

(15 citation statements)

References 22 publications

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“…During ECAP process of age-hardenable Al alloys, significant grain refinement as well as dislocation hardening occur together with precipitation hardening [8,15,16]. Therefore, combination of these three processes (solution treatment, aging and ECAP) may help to attain superior properties due to the high dislocation density and very fine precipitate distributions in the UFG microstructure [17]. In practice the formation of precipitates in the solution treated age-hardenable Al alloys leads to decline the formability of the processed material.…”

Section: Introductionmentioning

confidence: 99%

Effect of equal channel angular pressing on aging treatment of Al-7075 alloy

Shaeri

Salehi

Seyyedein

et al. 2015

Progress in Natural Science: Materials International

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The effect of aging treatment on microstructure and mechanical properties of equal channel angular pressed Al-7075 alloy was examined. Commercial Al-7075 alloy in the solid solution heat-treated condition was processed by equal channel angular pressing through route B C at both the room temperature and 120 1C. Only three passes of equal channel angular pressing was possible due to the low ductility of the alloy at both temperatures. Followed by equal channel angular pressing, the specimens have been aged at 120 1C for different aging times. Mechanical properties were measured by Vickers microhardness and tensile tests and microstructural observations were undertaken using transmission electron microscopy, X-ray diffractometer as well as optical microscopy. Microstructural investigations showed that ultrafine-grained materials with grain size in the range of 200-350 nm and 300-500 nm could be obtained after three passes of equal channel angular pressing at room temperature and 120 1C, respectively. Equal channel angular pressing of solid solution heat-treated Al-7075 alloy accelerates precipitation rate and subsequently leads to a significant decrease in aging time to attain maximum mechanical properties. Furthermore, it is possible to achieve maximum mechanical properties during equal channel angular pressing at 120 1C as a result of dynamic aging and formation of small ɳ´phase.

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Section: Introductionmentioning

confidence: 99%

Effect of equal channel angular pressing on aging treatment of Al-7075 alloy

Shaeri

Salehi

Seyyedein

et al. 2015

Progress in Natural Science: Materials International

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“…Several papers suggest that ageing of UFG materials should be performed at lower temperatures than the conventional material due to the accelerated diffusion [14,40,51]. Fig.2 shows precipitates in the alloy aged for 1h (a),(b) and 48h (c),(d).…”

Section: Ageing At 100cmentioning

confidence: 99%

“…Several papers report such a possibility without any detailed microstructure investigations [15,16,[40][41][42]. On the other hand, there are several works that evaluate different strengthening mechanisms with quantification of microstructure parameters [18,[43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Strengthening mechanisms in ultrafine grained Al-Mg-Si alloy processed by hydrostatic extrusion – Influence of ageing temperature

Chromiński

Wenner

Marioara

et al. 2016

Materials Science and Engineering: A

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Microstructure of hydrostatically extruded Al-Mg-Si alloy was studied by the combination of electron backscattered diffraction and transmission electron microscopy. Three different grain 2 types which feature various defects arrangements were detected. Post deformation ageing at two temperatures caused different precipitation phenomena which were strongly dependent on type of grain boundaries in the considered grain types. Thus, a combination of plastic deformation and ageing resulted in a material with complex microstructure. Based on transmission electron microscopy observations, contributions of different strengthening mechanisms were estimated and compared to experimental results. A good agreement between obtained data points confirmed that depending on grain type, different strengthening mechanisms are operative and the overall strength is a sum of hardening given by each of them. Ageing of ultrafine grain structure results in efficient precipitation strengthening. On the other hand ageing causes annihilation of low and high angle grains boundaries in which leads to softening of investigated material. This effect cannot be compensated by precipitation hardening.

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“…It was well reported by Zhao [24], Ghosh [25], Islamgaliev [26] and Zhenga et al [27] and associated researchers that heat-treatable Al alloys can be strengthened through the solid solution and precipitation hardening by selecting an appropriate heat treatment cycle. It was shown that conventional age-hardening could be combined with SPD, as shown by Vaseghi et al [28], as they reported the distribution of fine nano-sized precipitates dispersed in a UFG microstructure after age hardening. According to Zheng et al [27], the ultimate tensile strength (UTS) can be approximately 150 MPa higher after ECAP in comparison to conventional T6 condition for 7xxx series alloys.…”

Section: Introductionmentioning

confidence: 96%

Development of ultrafine grained Al–Zn–Mg–Cu alloy by equal channel angular pressing: microstructure, texture and mechanical properties

Ghosh

Gudimetla

et al. 2020

Archiv.Civ.Mech.Eng

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In this article, an effort has been made to investigate the evolution of microstructure, texture and mechanical properties of AA 7075 alloy during equal channel angular pressing (ECAP) by route B C at room temperature at a pressing speed of 1 mm/ min. Transmission electron microscopy (TEM) revealed the presence of rod-like (MgZn 2 ) precipitates in annealed conditions which were broken after two ECAP passes along with remarkable grain refinement due to high imposed strain after the second pass. After two consecutive ECAP passes, hardness, yield strength, and tensile strength of the alloy increased significantly in comparison to initial annealed condition. The fraction of high angle boundaries (HABs) and grain misorientation angle significantly increased after ECAP passes compared to the initial condition. Texture measurements were performed by X-ray diffractometer (XRD), on TD plane (parallel to extrusion direction). Texture results revealed the dominance of C and A * 2 components after the first pass and the presence of strong B , B and Ā components along with weaker A * 2 , C components after the second pass. Scanning electron microscopy (SEM) revealed that the average dimple size was gradually reduced with increasing the ECAP passes.

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A combination of severe plastic deformation and ageing phenomena in Al–Mg–Si Alloys

Cited by 46 publications

References 22 publications

Effect of equal channel angular pressing on aging treatment of Al-7075 alloy

Effect of equal channel angular pressing on aging treatment of Al-7075 alloy

Strengthening mechanisms in ultrafine grained Al-Mg-Si alloy processed by hydrostatic extrusion – Influence of ageing temperature

Development of ultrafine grained Al–Zn–Mg–Cu alloy by equal channel angular pressing: microstructure, texture and mechanical properties

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