Stability of microstructure in silver processed by severe plastic deformation

被引：2

作者：

Gubicza, Jeno ^{[1
]}

Chinh, Nguyen Q. ^{[1
]}

Labar, Janos L. ^{[1
,2
]}

Tichy, Geza ^{[1
]}

Hegedus, Zoltan ^{[1
]}

Xu, Cheng ^{[3
,4
]}

Langdon, Terence G. ^{[3
,4
,5
]}

机构：

[1] Eotvos Lorand Univ, Dept Mat Phys, Budapest, Hungary

[2] Res Inst Tech Phys & Mat Sci, Budapest, Hungary

[3] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA USA

[4] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA

[5] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton, Hants, England

来源：

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH | 2009年 / 100卷 / 06期

关键词：

Severe plastic deformation; Ultrafine-grained microstructure; Dislocations; Stacking fault energy; Recovery; STACKING-FAULT ENERGY; DISLOCATIONS; ALLOYS; COPPER;

D O I：

10.3139/146.110113

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The stability of the microstructure of pure silver processed by equal channel angular pressing at room temperature was studied by transmission electron microscopy and X-ray line profile analysis. After processing by I pass the microstructure was stable, whereas after 8 passes a static recovery/recrystallization of the severely deformed microstructure was observed a long time after deformation when the material was stored at room temperature. This unusual behavior is attributed to the high degree of dislocation dissociation due to the very low stacking fault energy of silver. The highly dissociated dislocations may be annihilated a long time after deformation due to thermal activation assisted by stresses which evolve in the severely deformed microstructures.

引用

页码：884 / 887

页数：4

共 13 条

[1] CLIMB OF EXTENDED EDGE DISLOCATIONS [J].

ARGON, AS ;

MOFFATT, WC .

ACTA METALLURGICA, 1981, 29 (02) :293-299

[2] Influence of stacking-fault energy on microstructural characteristics of ultrafine-grain copper and copper-zinc alloys [J].

Balogh, Levente ;

Ungar, Tamas ;

Zhao, Yonghao ;

Zhu, Y. T. ;

Horita, Zenji ;

Xu, Cheng ;

Langdon, Terence G. .

ACTA MATERIALIA, 2008, 56 (04) :809-820

[3] Stacking faults and twin boundaries in fcc crystals determined by x-ray diffraction profile analysis [J].

Balogh, Levente ;

Ribarik, Gabor ;

Ungar, Tamas .

JOURNAL OF APPLIED PHYSICS, 2006, 100 (02)

[4] Characteristics of face-centered cubic metals processed by equal-channel angular pressing [J].

Chinh, N. Q. ;

Gubicza, J. ;

Langdon, T. G. .

JOURNAL OF MATERIALS SCIENCE, 2007, 42 (05) :1594-1605

[5] Correlation between domain size obtained by X-ray Bragg profile analysis and macroscopic flow stress in severely plastically deformed copper [J].

Dubravina, A ;

Zehetbauer, MJ ;

Schafler, E ;

Alexandrov, IV .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 387 :817-821

[6] CROSS-SLIP OF SCREW DISLOCATIONS IN CUBIC STRUCTURE WITH CENTERED FACES [J].

ESCAIG, B .

JOURNAL DE PHYSIQUE, 1968, 29 (2-3) :225-&

[7] Microstructure and yield strength of severely deformed silver [J].

Gubicza, Jeno ;

Chinh, Nguyen Q. ;

Labar, Janos L. ;

Hegedus, Zoltan ;

Xu, Cheng ;

Langdon, Terence G. .

SCRIPTA MATERIALIA, 2008, 58 (09) :775-778

[8]

Hirth J.P., 1982, Theory of Dislocations

[9]

Kovacs I., 1973, Dislocations and Plastic Deformation

[10] Stage IV work hardening in cell forming materials .2. A new mechanism [J].

Ungar, T ;

Zehetbauer, M .

SCRIPTA MATERIALIA, 1996, 35 (12) :1467-1473

← 1 2 →