Aging Behaviour and Mechanical Properties of a Solution Treated and ECAP Processed 6082 Alloy

Angella, Giuliano; Bassani, Paola; Tuissi, A.; Vedani, Maurizio

doi:10.2320/matertrans.45.2282

Cited by 25 publications

(17 citation statements)

References 24 publications

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“…Например, авторы работы [15] показали, что ИПД, реализованное кручением под высоким давлением, и последующий от-жиг при 350°С в течение 1 часа алюминиевого сплава 2024 (Al-Cu-Mg) привели к выделению из пересыщен-ного твердого раствора совокупности частиц вторичных фаз Al 3 Fe, Al 6 Mn, Al 2 Cu и Al 2 CuMg, хотя при традицион-ной термообработке для сплавов системы Al-Cu-Mg ти-пичными считаются Al 2 Cu и / или Al 2 CuMg [18].…”

Section: Introductionunclassified

Phases changes of the AK12MMgN-18%SiCp composite alloy after severe plastic deformation and annealing

Khalikova¹,

Korznikova²,

Trifonov³

2017

LoM

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The effect of severe plastic deformation by high pressure torsion (HPT) on the structure of AK12MMgN-18 %SiCp composite alloy was investigated. A liquid-forged billet was taken as an initial material. Samples 8 mm in diameter and 0.45 mm in thickness were deformed by torsion in a Bridgman anvil at room temperature up to 5 turns under the pressure of 4 GPa. After deformation the samples were annealed in the temperature range of 300 -500°C for 5 minutes. The average area and volume fraction of particles in the initial, HPT-processed and annealed samples were evaluated. The change of the concentration level of a solid solution in the states under study was analyzed. It was shown that HPT led to a fragmentation of particles and a reduction of their average area: silicon particles from 4.4 ± 0.1 to 0.32 ± 0.02 μm 2 , intermetallic particles from 5.2 ± 2.6 to 0.20 ± 0.02 μm 2 , and SiC from 37.6 ± 0.9 to 3.9 ± 0.02 μm 2 . At the same time, a partial dissolution of excess phases occurred that resulted in the formation of a supersaturated solid solution. Post-HPT annealing led to a dissolution of the supersaturated solid solution with a separation of secondary phases of different morphology not typical to the alloy: globular silicon, rod shaped phase enriched by Ni, Si and Fe and a more compact phase containing Si and Cu. The higher the annealing temperature, the more intensive was the process of supersaturated solid solution decomposition and the higher was the volume fraction of silicon and intermetallic particles. Their average area increased with annealing temperature. No changes in the average area and volume fraction of SiC particles during annealings of HPT-processed alloy were observed. Исследовано влияние интенсивной пластической деформации, реализованное кручением под высоким давлением на структуру композиционного сплава АК12ММгН-18 %SiCp. Исходным материалом служила жидкоштампованная заготовка. Образцы диаметром 8 мм и толщиной 0,45 мм деформировали при комнатной температуре на наковаль-не Бриджмана кручением на 5 оборотов при давлении 4 ГПа. После деформации образцы отжигали в интервале температур 300…500°С в течение 5 минут. Оценивали среднюю площадь и объемную долю первичных и вторичных фаз, а также частиц SiC в исходном, деформированном и отоженном образцах. Проанализировали изменение ле-гированности твердого раствора в исследуемых состояниях. Показано, что интенсивная пластическая деформация привела к дроблению присутствующих в сплаве частиц, средний размер которых уменьшался: кремния с 4,4 ± 0,1 до 0,32 ± 0,02 мкм 2 , интерметаллидных фаз с 5,2 ± 2,6 до 0,20 ± 0,02 мкм 2 , SiC с 37,6 ± 0,9 до 3,9 ± 0,02 мкм 2 . При этом произошло частичное растворение избыточных фаз, что способствовало формированию пересыщенного твердого раствора. Последующий отжиг привел к распаду пересыщенного алюминиевого твердого раствора с выделением нетипичных для сплава вторичных фаз различной морфологии: глобулярного кремния, стержнеобразной фазы, обогащенной Ni, Si и Fe и более компактной фазы, содержащей Si и Cu. При этом, чем...

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Section: Introductionunclassified

Phases changes of the AK12MMgN-18%SiCp composite alloy after severe plastic deformation and annealing

Khalikova¹,

Korznikova²,

Trifonov³

2017

LoM

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“…Details of the microstructure evolution during ECAP and ASR processing have already been published elsewhere [13,17]. It is worth considering here that for both processes, after the first passes, sets of parallel bands of subgrains a few hundreds of micrometers in width are formed.…”

Section: Grain Structure After Spdmentioning

confidence: 99%

“…• C became so fast Figure 6: Morphology of strengthening precipitates detected in (a) solution annealed and peak aged coarse-grained alloy, (b) presolution annealed and peak-aged after 1 ECAP pass, (c) presolution annealed and peak-aged after 6 ECAP passes [13].…”

Section: Aging Kinetics Post-spd Aging Behaviour Was Further Investimentioning

confidence: 99%

“…Investigation on the strengthening precipitate structure found in the SPD processed samples was carried out only on a limited number of ECAP conditions [13]. Figure 6 depicts a colletion of TEM micrographs taken from ECAP samples peak aged at 130…”

Section: Strengthening Precipitatesmentioning

confidence: 99%

“…Some of the present authors [13,14] investigated the aging behaviour of several wrought alloys of the Al-Mg-Si system after ECAP and showed that precipitation kinetics in the ultrafine-grained alloys was markedly accelerated over the coarse-grained materials. It was also demonstrated that the formation of β /β phases occurred at lower temperatures with increasing ECAP strain, whereas β precipitation was strongly reduced due to expected formation of competing Si-rich phases in the heavily deformed structure.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aging Behaviour of Al-Mg-Si Alloys Subjected to Severe Plastic Deformation by ECAP and Cold Asymmetric Rolling

Farè

Lecis

Vedani

2011

Journal of Metallurgy

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A study was carried out on aging behaviour of a 6082 alloy processed by two different severe plastic deformation techniques: ECAP and asymmetric rolling. Both techniques were able to generate an ultrafine-grained structure in samples processed at room temperature. It was stated that severe straining promotes marked changes in the postdeformation aging kinetics. The peaks of β /β transition phases were anticipated and of progressively reduced intensity over the coarse grained alloy. A further peak accounting for onset of recrystallization also appeared in the most severely deformed samples. Full consistency in peak shape and position was found when comparing materials processed by ECAP and asymmetric rolling. Isothermal aging treatments performed at 180• C revealed that in the severely deformed samples, aging became so fast that the hardness curves continuously decreased due to overwhelming effects of structure restoration. On the contrary, aging at 130• C offers good opportunities for fully exploiting the precipitate hardening effects in the ultrafine-grained alloy.

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DSC analysis of strengthening precipitates in ultrafine Al–Mg–Si alloys

Vedani

Angella

Bassani

et al. 2007

J Therm Anal Calorim

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Aging Behaviour and Mechanical Properties of a Solution Treated and ECAP Processed 6082 Alloy

Cited by 25 publications

References 24 publications

Phases changes of the AK12MMgN-18%SiCp composite alloy after severe plastic deformation and annealing

Phases changes of the AK12MMgN-18%SiCp composite alloy after severe plastic deformation and annealing

Aging Behaviour of Al-Mg-Si Alloys Subjected to Severe Plastic Deformation by ECAP and Cold Asymmetric Rolling

DSC analysis of strengthening precipitates in ultrafine Al–Mg–Si alloys

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