Effects of extrusion parameters on the microstructure and mechanical properties of Mg-Zn-(Mn)-Ce/Gd alloys

被引：126

作者：

Park, Sung Hyuk ^{[1
]}

You, Bong Sun ^{[1
]}

Mishra, Raja K. ^{[2
]}

Sachdev, Anil K. ^{[2
]}

机构：

[1] Korea Inst Mat Sci, Light Met Div, Chang Won 641831, South Korea

[2] Gen Motors R&D Ctr, Warren, MI 48090 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 598卷

关键词：

Magnesium alloy; Extrusion; Dynamic recrystallization; Tensile properties; EXTRUDED MG-3AL-1ZN ALLOY; MAGNESIUM ALLOYS; CERIUM ADDITION; HOT-WORKING; ZK60; ALLOY; TEMPERATURES; EVOLUTION; TEXTURE;

D O I：

10.1016/j.msea.2014.01.051

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effects of extrusion parameters on the microstructure and tensile properties of the Mg-2Zn-0.5Ce, Mg-1Zn-1Mn-0.5Ce, and Mg-2Zn-1.5Gd alloys were investigated by conducting indirect extrusion at different temperatures, ram speeds, and extrusion ratios. All of the extruded alloys exhibited a bimodal grain structure composed of equiaxed fine recrystallized (DRXed) grains and elongated coarse unDRXed grains, except for some alloys extruded at a high temperature and a fast speed. With an increase in the temperature, speed, and ratio of extrusion, the average size and area fraction of the DRXed grains increased as a result of the temperature rise at the deformation zone caused by deformation heating. The yield strength increased with a decrease in the size of the DRXed grains according to the Hall-Petch relation, while the elongation increased with an increase in the fraction of the DRXed grains due to the suppression of {10 - 11}-{10 - 12} double twinning, irrespective of alloy composition. Due to these relationships between the microstructural characteristics and tensile properties, the yield strength decreased but the elongation increased when the temperature, speed, and ratio were increased. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：396 / 406

页数：11

共 22 条

[1] Twinning and the ductility of magnesium alloys Part II. "Contraction" twins [J].

Barnett, M. R. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2007, 464 (1-2) :8-16

[2]

Bettles C, 2012, WOODHEAD PUBL MATER, pXIII

[3] Current wrought magnesium alloys: Strengths and weaknesses [J].

Bettles, CJ ;

Gibson, MA .

JOM, 2005, 57 (05) :46-49

[4] Strength and ductility of novel Mg-8Sn-1Al-1Zn alloys extruded at different speeds [J].

Cheng, W. L. ;

Kim, H. S. ;

You, B. S. ;

Koo, B. H. ;

Park, S. S. .

MATERIALS LETTERS, 2011, 65 (11) :1525-1527

[5]

DOAN JP, 1947, T AM I MIN MET ENG, V171, P286

[6]

Feltham P., 1956, Met. Treat. Drop Forg., V23, P440

[7] Correlation of plastic deformation and dynamic recrystallization in magnesium alloy Zk60 [J].

Galiyev, A ;

Kaibyshev, R ;

Gottstein, G .

ACTA MATERIALIA, 2001, 49 (07) :1199-1207

[8] Effect of Extrusion Parameters on Mechanical Properties of Mg97Zn1Y2 Alloys at Room and Elevated Temperatures [J].

Hirano, Masaaki ;

Yamasaki, Michiaki ;

Hagihara, Koji ;

Higashida, Kenji ;

Kawamura, Yoshihito .

MATERIALS TRANSACTIONS, 2010, 51 (09) :1640-1647

[9]

Humphreys F.J., 2005, RECRYSTALLIZATION RE

[10]

Luo A.A., 2005, SAE TRANSACTIONS, P411

← 1 2 3 →