High-Temperature Mechanical Behavior of Extruded Mg-Y-Zn Alloy Containing LPSO Phases

被引：94

作者：

Onorbe, Elvira ^{[1
]}

Garces, Gerardo ^{[1
]}

Dobes, Ferdinand ^{[2
]}

Perez, Pablo ^{[1
]}

Adeva, Paloma ^{[1
]}

机构：

[1] CENIM CSIC, Natl Ctr Met Res, Dept Met Phys, Madrid 28040, Spain

[2] Acad Sci Czech Republ, Inst Phys Mat, Brno 61662, Czech Republic

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2013年 / 44A卷 / 06期

关键词：

MAGNESIUM ALLOYS; CREEP-BEHAVIOR; DEFORMATION MECHANISM; SUPERPLASTIC FLOW; SOLID-SOLUTION; GRAIN-SIZE; MICROSTRUCTURE; EXTRUSION; EVOLUTION; STRENGTH;

D O I：

10.1007/s11661-013-1628-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The high-temperature mechanical behavior of extruded Mg97-3x Y-2x Zn (x) (at. pct) alloys is evaluated from 473 K to 673 K (200 A degrees C to 400 A degrees C). The microstructure of the extruded alloys is characterized by Long Period Stacking Ordered structure (LPSO) elongated particles within the magnesium matrix. At low temperature and high strain rates, their creep behavior shows a high stress exponent (n = 11) and high activation energy. Alloys behave as a metal matrix composite where the magnesium matrix transfers part of its load to the LPSO phase. At high-temperature and/or low stresses, creep is controlled by nonbasal dislocation slip. At intermediate and high strain rates at 673 K (400 A degrees C) and at intermediate strain rates between 623 K and 673 K (350 A degrees C and 400 A degrees C), the extruded alloys show superplastic deformation with elongations to failure higher than 200 pct. Cracking of coarse LPSO second-phase particles and their subsequent distribution in the magnesium matrix take place during superplastic deformation, preventing magnesium grain growth.

引用

页码：2869 / 2883

页数：15

共 36 条

[1]

Ashby M.F., 1982, DEFORMATION MECH MAP

[2] Development of novel grain morphology during hot extrusion of magnesium AZ21 alloy [J].

Azeem, M. A. ;

Tewari, A. ;

Mishra, S. ;

Gollapudi, S. ;

Ramamurty, U. .

ACTA MATERIALIA, 2010, 58 (05) :1495-1502

[3] Microstructure and texture development during hydrostatic extrusion of magnesium alloy AZ31 [J].

Bohlen, J ;

Yi, SB ;

Swiostek, J ;

Letzig, D ;

Brokmeier, HG ;

Kainer, KU .

SCRIPTA MATERIALIA, 2005, 53 (02) :259-264

[4] IS CREEP IN DISCONTINUOUS METAL-MATRIX COMPOSITES LATTICE DIFFUSION-CONTROLLED [J].

CADEK, J ;

SUSTEK, V ;

PAHUTOVA, M .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1994, 174 (02) :141-147

[5] Separated contribution of particles and matrix on the creep behavior of dispersion strengthened materials [J].

Carreno, F ;

Ruano, OA .

ACTA MATERIALIA, 1998, 46 (01) :159-167

[6] Effect of materials and temperature on the forward extrusion of magnesium alloys [J].

Chandrasekaran, M ;

John, YMS .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 381 (1-2) :308-319

[7] Novel equilibrium two phase Mg alloy with the long-period ordered structure [J].

Chino, Y ;

Mabuchi, M ;

Hagiwara, S ;

Iwasaki, H ;

Yamamoto, A ;

Tsubakino, H .

SCRIPTA MATERIALIA, 2004, 51 (07) :711-714

[8] Processing and properties of Mg-6Gd-1Zn-0.6Zr: Part 1-Recrystallisation and texture development [J].

Chun, Y. B. ;

Geng, J. ;

Stanford, N. ;

Davies, C. H. J. ;

Nie, J. F. ;

Barnett, M. R. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2011, 528 (10-11) :3653-3658

[9]

DOBES F, 1986, J TEST EVAL, V14, P271, DOI 10.1520/JTE10341J

[10]

EDINGTON JW, 1976, PROG MATER SCI, V21, P63, DOI 10.1016/0079-6425(76)90005-0

← 1 2 3 4 →