Microstructural evolution and its effect on Hall-Petch relationship in friction stir welding of thixomolded Mg alloy AZ91D

被引：158

作者：

Park, SHC ^{[1
]}

Sato, YS ^{[1
]}

Kokawa, H ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Proc, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF MATERIALS SCIENCE | 2003年 / 38卷 / 21期

关键词：

D O I：

10.1023/A:1026351619636

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microstructural evolution of a thixomolded magnesium (Mg) alloy AZ91D during friction stir welding was investigated. Friction stir welding resulted in a homogeneous microstructure consisting of fine recrystallised alpha-Mg grains in the thixomolded material. The microstructural homogenisation and refinement was attributed to dynamic recrystallisation accompanied by the dissolution of the eutectic structure during the welding. The grain refinement in the stir zone was effective in increasing the hardness, as predicted by the Hall-Petch equation. The effect of grain size on hardness was smaller than that in conventional and rapidly solidified AZ91. This phenomenon may be explained as being due to the microstructure of the stir zone which consisted of fine equiaxed grains with a high density of dislocations. (C) 2003 Kluwer Academic Publishers.

引用

页码：4379 / 4383

页数：5

共 32 条

[1]

[Anonymous], ENG MAT

[2]

[Anonymous], P 3 INT S FRICT STIR

[3]

[Anonymous], 2002, WELD J

[4] Correlating the microstructure and tensile properties of a thixomolded AZ91D magnesium alloy [J].

Czerwinski, F ;

Zielinska-Lipiec, A ;

Pinet, PJ ;

Overbeeke, J .

ACTA MATERIALIA, 2001, 49 (07) :1225-1235

[5]

Dawes C. J., 1996, P 6 INT S JWS NAG JA, P711

[6]

Dawes CJ, 1996, WELD J, V75, P41

[7] Friction-stir welding of magnesium alloy AZ31B [J].

Esparza, JA ;

Davis, WC ;

Trillo, EA ;

Murr, LE .

JOURNAL OF MATERIALS SCIENCE LETTERS, 2002, 21 (12) :917-920

[8] Heterogeneity of crystallographic texture in friction stir welds of aluminum [J].

Field, DP ;

Nelson, TW ;

Hovanski, Y ;

Jata, KV .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2001, 32 (11) :2869-2877

[9] DYNAMIC RECRYSTALLIZATION AND THE DEVELOPMENT OF MICROSTRUCTURE DURING THE HIGH-TEMPERATURE DEFORMATION OF MAGNESIUM [J].

ION, SE ;

HUMPHREYS, FJ ;

WHITE, SH .

ACTA METALLURGICA, 1982, 30 (10) :1909-1919

[10] Continuous dynamic recrystallization during friction stir welding of high strength aluminum alloys [J].

Jata, KV ;

Semiatin, SL .

SCRIPTA MATERIALIA, 2000, 43 (08) :743-749

← 1 2 3 4 →