Ultrafine Grained Structures Resulting from SPD-Induced Phase Transformation in Al-Zn Alloys

被引：95

作者：

Sauvage, Xavier ^{[1
,2
]}

Murashkin, Maxim Yu. ^{[3
]}

Straumal, Boris B. ^{[4
,5
,6
]}

Bobruk, Elena V. ^{[3
]}

Valiev, Ruslan Z. ^{[3
,7
]}

机构：

[1] Univ St Etienne Rouvray, Grp Phys Mat, UMR CNRS 6634, F-76801 St Etienne, France

[2] INSA Rouen, F-76801 St Etienne, France

[3] Ufa State Aviat Tech Univ, Inst Phys Adv Mat, Ufa 45000, Russia

[4] State Univ, Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Russia

[5] Natl Univ Sci & Technol MISIS, Lab Hybrid Nanomat, Moscow 119049, Russia

[6] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia

[7] St Petersburg State Polytech Univ, Res Lab Mech New Nanomat, St Petersburg 195251, Russia

来源：

ADVANCED ENGINEERING MATERIALS | 2015年 / 17卷 / 12期

基金：

俄罗斯基础研究基金会;

关键词：

SEVERE PLASTIC-DEFORMATION; HIGH-PRESSURE TORSION; HIGH-STRENGTH; DISCONTINUOUS PRECIPITATION; MG-SI; DIFFUSION; METALS; DECOMPOSITION; DUCTILITY; SEGREGATION;

D O I：

10.1002/adem.201500151

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Three different Al-Zn alloys (2, 10, 30 wt% Zn) have been processed by severe plastic deformation (SPD) in the solutionized state to investigate the concomitant mechanisms of grain refinement and phase separation. The data of high resolution analytical transmission electron microscopy clearly reveal the key role of grain boundaries that promote Zn segregation and fast diffusion. Surprisingly, it is also shown that SPD carried out at 150 degrees C could give rise to a finer multiphase structure comparing to room temperature processing. Our observations seem to indicate that it resulted from a competition between the classical discontinuous precipitation of Zn and SPD-induced dynamic precipitation.

引用

页码：1821 / 1827

页数：7

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