An electron microscope investigation of the microstructure in an aluminium-zinc-magnesium alloy

Gjønnes, J.; Simensen, Christian J.

doi:10.1016/0001-6160(70)90016-7

Cited by 250 publications

(87 citation statements)

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“…The predicted {l11} fcc habit plane of the 'I' phase in the fcc AI-based matrix is in agreement with electron microscopic observations [23,24]. is the anisotropy parameter [20].…”

Section: A Single Precipitate In An Infinite Bodysupporting

confidence: 82%

Strain Controlled Morphologies in the Two-Phase State

Khachaturyan

1989

Alloy Phase Stability

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“…The predicted {l11} fcc habit plane of the 'I' phase in the fcc AI-based matrix is in agreement with electron microscopic observations [23,24]. is the anisotropy parameter [20].…”

Section: A Single Precipitate In An Infinite Bodysupporting

confidence: 82%

Strain Controlled Morphologies in the Two-Phase State

Khachaturyan

1989

Alloy Phase Stability

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“…The weak diffraction at {311}/2 is from GP (II) zones [24] and the diffraction spots close to {111} are from η and η at ¾{220} [25,26]. [27,28].…”

Section: Microstructure Characterization Before Dynamic Testingmentioning

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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“…So far, there exist several models for the composition and crystal structure of g 0 phase. Initially, Gjonnes and Simensen [7] proposed an orthorhombic structure for g 0 phase with stoichiometry MgZn 2 . However, by means of the X-ray diffraction, Auld and Cousland [8] Kverneland et al [11] proposed a new model for g 0 phase with space group P63/mmc and Mg 2 Zn 5Àx Al 2+x composition (x = 2-4), named ''Model II''.…”

Section: Introductionmentioning

confidence: 99%