Mechanical behavior and strengthening mechanisms in ultrafine grain precipitation-strengthened aluminum alloy

Ma, Kun; Wen, Haiming; Hu, Tao; Topping, Troy D.; Isheim, Dieter; Seidman, David N.; Lavernia, Enrique J.; Schoenung, Julie M.

doi:10.1016/j.actamat.2013.09.042

Cited by 1,383 publications

(352 citation statements)

References 62 publications

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“…These two kinds of BCC/B2 microstructures are resulted from the composition segregation, which could be also verified by the XRD results that the diffraction peaks of BCC and B2 phases are widened clearly (Figure 1). Thereof, in the BCC/B2 regions with a very high Al content, the ordered B2 phase becomes the matrix, and the disorder BCC is the precipitated phase with a spherical morphology, which is contrary to the common image that the ordered phase is always precipitated on the disordered BCC matrix [30][31][32][33][34][35][36].…”

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 51%

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The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Jiang

et al. 2017

Metals

136

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Abstract:The present work primarily investigates the morphological evolution of the body-centered-cubic (BCC)/B2 phases in Al x NiCoFeCr high-entropy alloys (HEAs) with increasing Al content. It is found that the BCC/B2 coherent morphology is closely related to the lattice misfit between these two phases, which is sensitive to Al. There are two types of microscopic BCC/B2 morphologies in this HEA series: one is the weave-like morphology induced by the spinodal decomposition, and the other is the microstructure of a spherical disordered BCC precipitation on the ordered B2 matrix that appears in HEAs with a much higher Al content. The mechanical properties, including the compressive yielding strength and microhardness of the Al x NiCoFeCr HEAs, are also discussed in light of the concept of the valence electron concentration (VEC).

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Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 51%

“…Especially if the shape of the precipitates is closely related to the lattice misfit, ε, between the precipitated phase and the matrix phase [29,[31][32][33][34][35][36][37][38]. Generally speaking, a smaller …”

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 99%

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Jiang

et al. 2017

Metals

136

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show abstract

“…1). Thereof, in the BCC/B2 regions with a very high Al content, the ordered B2 phase becomes the matrix, and the disorder BCC is the precipitated phase with a spherical morphology, which is contrary to the common image that the ordered phase is always precipitated on the disordered BCC matrix [30][31][32][33][34][35].…”

Section: Microscopic Morphologies Of Bcc/b2 Phases In Heasmentioning

confidence: 52%

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

Ma¹,

Jiang²,

Li³

et al. 2017

Preprint

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Abstract:The present work investigates primarily the morphology evolution of the body-centeredcubic (BCC)/B2 phases in AlxNiCoFeCr high-entropy alloys (HEAs) with increasing Al content, which has been neglected so far. There exist two types of microscopic morphologies of BCC and B2 phases in this HEA series: one is the weave-like morphology induced by the spinodal decomposition, and the other is the microstructure of a spherical disordered BCC precipitation on the ordered B2 matrix that appears in HEAs with a much higher Al content. The shape of coherent precipitates is found to be closely related to the lattice misfit between BCC and B2 phases, which is sensitive to Al. The mechanical properties, including the compressive yielding strength and microhardness of the AlxNiCoFeCr HEAs, are also discussed in light of the concept of the valence electron concentration (VEC).

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“…More recently, there is a growing interest in investigating the coupling effect of grain refinement and the introduction of dislocations and precipitation on the strength of Al alloys [13,14]. Very recent experiments showed that a UFG 7075 alloy processed by ECAP for only 4 passes achieved maximum tensile properties due to the presence of many fine η phases and minor quantities of GP zones distributed in fine grains having a size of less than 600 nm [15].…”

Section: Introductionmentioning

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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Mechanical behavior and strengthening mechanisms in ultrafine grain precipitation-strengthened aluminum alloy

Cited by 1,383 publications

References 62 publications

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

The BCC/B2 Morphologies in AlxNiCoFeCr High-Entropy Alloys

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

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