INFLUENCE OF HETEROGENEITY OF MICROSTRUCTURE ON CREEP BEHAVIOUR OF SPD METALS

被引：0

作者：

Kral, Petr ^{[1
]}

Dvorak, Jiri ^{[1
]}

Kvapilova, Marie ^{[1
]}

Svoboda, Milan ^{[1
]}

Sklenicka, Vaclav ^{[1
]}

机构：

[1] ASCR, IPM, Brno, Czech Republic

来源：

NANOCON 2012, 4TH INTERNATIONAL CONFERENCE | 2012年

关键词：

ECAP; electron back scatter diffraction; creep behavior; SEVERE PLASTIC-DEFORMATION; ALUMINUM; EVOLUTION; ALLOYS; ECAP;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The methods of severe plastic deformation enable a production of bulk metals with the submicrometer or even nanometer grain size. Experiments were conducted to determine an effect of equal-channel angular pressing (ECAP) on the creep behavior of pure metal. The ECAP deformation was performed at room temperature by route Bc. Constant load creep tests in tension were conducted at 373 K under different stresses. The values of the stress exponent n of the minimum creep rate for ultrafine-grained material were determined. Microstructure of samples was characterized by scanning electron microscope equipped with the electron backscatter diffraction unit. Heterogeneity of microstructure was evaluated by coefficient of variation CVa. It was found that the fracture behavior in UFG materials is influenced by GBS, formation of mesoscopic shear bands and cavitation.

引用

页码：772 / 777

页数：6

共 17 条

[1] Microstructural evolution and mechanical properties of high purity aluminium processed by equal-channel angular pressing [J].

Dvorak, Jiri ;

Sklenicka, Vaclav ;

Horita, Zenji .

MATERIALS TRANSACTIONS, 2008, 49 (01) :15-19

[2] Microstructure Stability and Creep Behaviour of a Cu-0.2wt.%Zr Alloy Processed by Equal-Channel Angular Pressing [J].

Dvorak, Jiri ;

Kral, Petr ;

Kvapilova, Marie ;

Svoboda, Milan ;

Sklenicka, Vaclay .

NANOMATERIALS BY SEVERE PLASTIC DEFORMATION: NANOSPD5, PTS 1 AND 2, 2011, 667-669 :821-826

[3] Microstructural development in equal-channel angular pressing using a 60° die [J].

Furuno, K ;

Akamatsu, H ;

Oh-ishi, K ;

Furukawa, M ;

Horita, Z ;

Langdon, TG .

ACTA MATERIALIA, 2004, 52 (09) :2497-2507

[4] Characterization of creep properties and creep textures in pure aluminum processed by equal-channel angular pressing [J].

Kawasaki, Megumi ;

Beyerlein, Irene J. ;

Vogel, Sven C. ;

Langdon, Terence G. .

ACTA MATERIALIA, 2008, 56 (10) :2307-2317

[5] Microstructural evolution and creep of an Al-0.2wt.%Sc alloy after equal-channel angular pressing [J].

Kral, P. ;

Dvorak, J. ;

Sklenicka, V. .

NANOMATERIALS BY SEVERE PLASTIC DEFORMATION IV, PTS 1 AND 2, 2008, 584-586 :846-851

[6]

Kral P., 2009, 2 INT S BULK NAN MAT, P244

[7] Fatigue strength, microstructural stability and strain localization in ultrafine-grained copper [J].

Kunz, L. ;

Lukas, P. ;

Svoboda, M. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2006, 424 (1-2) :97-104

[8] Subgrain boundaries in ECAP aluminium [J].

Saxl, I. ;

Sklenicka, V. ;

Ilucova, L. ;

Svoboda, M. ;

Kral, P. .

PRICM 6: SIXTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-3, 2007, 561-565 :813-+

[9] Effect of equal-channel angular pressing (ECAP) on creep in aluminium alloys [J].

Sklenicka, V. ;

Dvorak, J. ;

Kvapilova, M. ;

Svoboda, M. ;

Kral, P. ;

Saxl, I. ;

Horita, Z. .

THERMEC 2006, PTS 1-5, 2007, 539-543 :2904-+

[10] Creep processes in pure aluminium processed by equal-channel angular pressing [J].

Sklenicka, V ;

Dvorak, J ;

Kral, P ;

Stonawska, Z ;

Svoboda, M .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2005, 410 :408-412

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