Precipitation phenomena in an ultrafine-grained Al alloy

Hu, Tao; Ma, Kun; Topping, Troy D.; Schoenung, Julie M.; Lavernia, Enrique J.

doi:10.1016/j.actamat.2012.12.037

Cited by 230 publications

(79 citation statements)

References 73 publications

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“…The coarsening of precipitates may also be attributed to the higher dislocation density during ECAP for additional 4 passes. It has been proposed that the nucleation and coarsening of precipitates may be assisted by dislocations through a heterogeneous nucleation process [36].…”

Section: Precipitation Evolution During Dynamic Compressionmentioning

confidence: 99%

Effect of ECAP processing on microstructure evolution and dynamic compressive behavior at different temperatures in an Al-Zn-Mg alloy

Afifi

Pereira

Wang

et al. 2017

Materials Science and Engineering: A

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An artificially aged Al-Zn-Mg alloy with a grain size of ~ 1.3 m was processed by equalchannel angular pressing (ECAP) and then subjected to dynamic compression at a strain rate of 4000 s -1 in the range from room temperature to 673 K. The results show the η phase is refined and a η phase is formed during the first pass of ECAP and after further processing 8 passes the GP zones are removed. An ultrafine-grained (UFG) structure with an average grain size of ~200 nm was obtained after 4 passes. It is shown that dynamic compressive deformation assists the precipitation process through precipitate coalescence and by changing the precipitate orientations.The dynamic compressive yield strengths and flow stresses decrease gradually to different degrees with increasing temperature except after ECAP processing for 4 passes where there is thermal stability up to 473 K. The ECAP processing significantly improves the strength of the alloy at elevated temperatures by comparison with the as-received material.

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Section: Precipitation Evolution During Dynamic Compressionmentioning

confidence: 99%

Effect of ECAP processing on microstructure evolution and dynamic compressive behavior at different temperatures in an Al-Zn-Mg alloy

Afifi

Pereira

Wang

et al. 2017

Materials Science and Engineering: A

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“…Consequently, a T6 heat treatment consisting of a solid solution treatment, usually for 1 h at 470 to 500 • C and subsequent quenching in water is applied to form a solid solution and annihilate the dislocations [3,7,8]. It is followed by a controlled ageing step during which new precipitates form in the grain interior [1,2,4,7,8].…”

Section: Proceedings Of the International Symposium On Physics Of Matmentioning

confidence: 99%

Microstructure and Properties of Spark Plasma Sintered Al-Zn-Mg-Cu Alloy

et al. 2015

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The microstructure of an aluminum alloy containing 53 wt% Zn, 2.1 wt% Mg and 1.3 wt% Cu as main alloying elements has been studied with the focus on the precipitation behavior during the spark plasma sintering process. The starting material was an atomized AlZnMgCu powder with the particle size below 50 µm. The particles showed a solidication microstructure from cellular to columnar or equiaxed dendritic morphology with a large fraction of the alloying elements segregated in form of intermetallic phases, mainly (Zn,Al,Cu)49Mg32 and Mg2(Zn,Al,Cu)11, at the cell and dendrite boundaries. The microstructure of the sintered specimens followed the microstructure of the initial powder. However, Mg(Zn,Al,Cu)2 precipitates evolve at the expense of the initial precipitate phases. The precipitates which were initially continuously distributed along the intercellular and interdendritic boundaries form discrete chain-like structures in the sintered samples. Additionally, ne precipitates created during the sintering process evolve at the new low-angle boundaries. The large fraction of precipitates at the grain boundaries and especially at the former particle boundaries could not be solved into the matrix applying a usual solid solution heat treatment. A bending test reveals low ductility and strength. The mechanical properties suer from the precipitates at former particle boundaries leading to fracture after an outer ber tensile strain of 3.8%.

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“…For cast alloys, shorter times of SHT are needed to completely homogenize finer microstructures [18], but the characteristically fine microstructure of SLM parts required longer SHT durations to stabilize the microstructure and enhance the mechanical response with and without aging. Precipitation behavior in coarse-grained Al alloys differs from that in ultrafine-grained Al alloys [19]. Consequently, when dealing with Al alloys processed by SLM, it is crucial to bear in mind that it is an ultrafine-grained material rather than a conventional coarsegrained.…”

mentioning

confidence: 99%

On the Precipitation Hardening of Selective Laser Melted AlSi10Mg

Aboulkhair

Tuck

Ashcroft

et al. 2015

Metall Mater Trans A

245

105

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Precipitation hardening of selective laser melted AlSi10Mg was investigated in terms of solution heat treatment and aging duration. The influence on the microstructure and hardness was established, as was the effect on the size and density of Si particles. Although the hardness changes according to the treatment duration, the maximum hardening effect falls short of the hardness of the as-built parts with their characteristic fine microstructure. This is due to the difference in strengthening mechanisms.

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Precipitation phenomena in an ultrafine-grained Al alloy

Cited by 230 publications

References 73 publications

Effect of ECAP processing on microstructure evolution and dynamic compressive behavior at different temperatures in an Al-Zn-Mg alloy

Effect of ECAP processing on microstructure evolution and dynamic compressive behavior at different temperatures in an Al-Zn-Mg alloy

Microstructure and Properties of Spark Plasma Sintered Al-Zn-Mg-Cu Alloy

On the Precipitation Hardening of Selective Laser Melted AlSi10Mg

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