The Serrated Flow Behavior of Mg-Gd(-Mn-Sc) Alloys

被引：36

作者：

Fang, X. Y. ^{[1
,2
]}

Yi, D. Q. ^{[2
]}

Nie, J. F. ^{[1
]}

机构：

[1] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia

[2] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2009年 / 40A卷 / 11期

关键词：

RARE EARTH ALLOYS; TENSILE PROPERTIES; WT.PERCENT ALLOY; THORIUM ALLOY; ND ALLOY; MAGNESIUM; MG; CREEP; PRECIPITATION; DEFORMATION;

D O I：

10.1007/s11661-009-9967-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The tensile deformation behavior of extruded samples of Mg-0.8 pet Gd and Mg-0.8 pet Gd-0.5 pet Mn-0.45 pet Sc (at. pet) alloys has been studied. Both alloys exhibit serrated flow when they are tensile tested at temperatures ranging from 150 degrees C to 300 degrees C and at strain rates of 1.67 x 10(-4) s(-1) to 1.67 x 10(-2) s(-1), and this serrated flow behavior is significantly affected by postextrusion heat treatments. Combined with observations made by transmission electron microscopy (TEM) and three-dimensional atom probe (3DAP), the serrated flow is attributed to dynamic interactions between solute atoms and gliding dislocations. It is suggested that Gd atoms in the solid solution matrix of magnesium are mainly responsible for the serrations in the two alloys. The additions of Mn and Sc to the Mg-Gd alloy strengthen the dynamic solute-dislocation interactions and lead to a lower critical strain and larger stress drops of the serrated flow in the Mg-Gd-Mn-Sc alloy.

引用

页码：2761 / 2771

页数：11

共 34 条

[1] Hardening precipitation in a Mg-4Y-3RE alloy [J].

Antion, C ;

Donnadieu, P ;

Perrard, F ;

Deschamps, A ;

Tassin, C ;

Pisch, A .

ACTA MATERIALIA, 2003, 51 (18) :5335-5348

[2] Aging characteristics and high temperature tensile properties of Mg-Gd-Y-Zr alloys [J].

Anyanwu, IA ;

Kamado, S ;

Kojima, Y .

MATERIALS TRANSACTIONS, 2001, 42 (07) :1206-1211

[3] Precipitation reactions in magnesium-rare earth alloys containing Yttrium, Gadolinium or Dysprosium [J].

Apps, PJ ;

Karimzadeh, H ;

King, JF ;

Lorimer, GW .

SCRIPTA MATERIALIA, 2003, 48 (08) :1023-1028

[4] SERRATED YIELDING IN ALUMINIUM-3( MAGNESIUM [J].

BRINDLEY, BJ ;

WORTHINGTON, PJ .

ACTA METALLURGICA, 1969, 17 (11) :1357-+

[5]

Chaturvedi M., 1972, Metal Science Journal, V6, P16

[6] ONSET OF SERRATED YIELDING IN MG-10AG ALLOY [J].

CHATURVEDI, MC ;

LLOYD, DJ .

PHILOSOPHICAL MAGAZINE, 1974, 30 (06) :1199-1207

[7] Influence of deformation on precipitation process in Mg-15 wt.%Gd alloy [J].

Cizek, Jakub ;

Prochazka, Ivan ;

Smola, Bohumil ;

Stulikova, Ivana ;

Ocenasek, Vladivoj .

JOURNAL OF ALLOYS AND COMPOUNDS, 2007, 430 (1-2) :92-96

[8] Seffated flow in magnesium alloy AZ91 [J].

Corby, C ;

Cáceres, CH ;

Lukac, P .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 387 :22-24

[9] YIELD POINTS IN A DILUTE MAGNESIUM-THORIUM ALLOY [J].

COULING, SL .

ACTA METALLURGICA, 1959, 7 (02) :133-134

[10] Solid solution strengthening behaviors in binary Mg-Y single phase alloys [J].

Gao, L. ;

Chen, R. S. ;

Han, E. H. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 472 (1-2) :234-240

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