Origins of high strength and ductility combination in a Guinier-Preston zone containing Mg-Al-Ca-Mn alloy

被引：27

作者：

Bhattacharyya, J. J. ^{[1
]}

Nakata, T. ^{[2
]}

Kamado, S. ^{[2
]}

Agnew, S. R. ^{[1
]}

机构：

[1] Univ Virginia, Charlottesville, VA 22904 USA

[2] Nagaoka Univ Technol, Nagaoka, Niigata, Japan

来源：

SCRIPTA MATERIALIA | 2019年 / 163卷 / 121-124期

基金：

日本科学技术振兴机构;

关键词：

Rate sensitivity; Plastic instability; Haasen plot; Thermal activation; Instability analysis; STRAIN-RATE SENSITIVITY; CROSS-SLIP STRESS; THERMAL-ACTIVATION; EXTRUSION LIMITS; MAGNESIUM ALLOYS; PRISMATIC GLIDE; COPPER-SILICA; IN-SITU; DEFORMATION; FRACTURE;

D O I：

10.1016/j.scriptamat.2019.01.013

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The excellent strength and ductility combination of a microalloyed Mg-Al-Ca-Mn, in the peak-aged condition, has been reported previously. However, a mechanistic explanation has not been reported. The present work shows that an enhanced strain-rate sensitivity is responsible for this behavior. Increased post-uniform elongation compensates for the decrease in uniform elongation upon aging, resulting in a total elongation comparable to the solutionized material. The thermally activated nature of dislocation interactions with Guinier-Preston (GP) zones are discussed, and the potential for optimizing mechanical properties by engineering the strain-rate sensitivity through microstructural modifications is highlighted. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：121 / 124

页数：4

共 60 条

[1]

Agnew S. R., 2008, MAGNES TECHNOL, V2008, P159

[2] SOLID SOLUTION STRENGTHENING OF MAGNESIUM SINGLE CRYSTALS .2. EFFECT OF SOLUTE ON EASE OF PRISMATIC SLIP [J].

AKHTAR, A ;

TEGHTSOONIAN, E .

ACTA METALLURGICA, 1969, 17 (11) :1351-+

[3]

[Anonymous], 2008, Strengthening mechanisms in crystal plasticity

[4] DEFORMATION OF PLASTICALLY NON-HOMOGENEOUS MATERIALS [J].

ASHBY, MF .

PHILOSOPHICAL MAGAZINE, 1970, 21 (170) :399-&

[5] Extrusion limits of magnesium alloys [J].

Atwell, Dale L. ;

Barnett, Matthew R. .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2007, 38A (12) :3032-3041

[6] The effect of precipitate-induced backstresses on plastic anisotropy: Demonstrated by modeling the behavior of aluminum alloy, 7085 [J].

Bhattacharyya, J. J. ;

Bittmann, B. ;

Agnew, S. R. .

INTERNATIONAL JOURNAL OF PLASTICITY, 2019, 117 :3-20

[7] Deformation and fracture behavior of Mg alloy, WE43, after various aging heat treatments [J].

Bhattacharyya, J. J. ;

Wang, F. ;

McQuade, P. J. ;

Agnew, S. R. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2017, 705 :79-88

[8]

Bhattacharyya J.J., 2018, ACTA MAT

[9] WORK-HARDENING OF COPPER-SILICA .2. ROLE OF PLASTIC RELAXATION [J].

BROWN, LM ;

STOBBS, WM .

PHILOSOPHICAL MAGAZINE, 1971, 23 (185) :1201-&

[10] WORK-HARDENING OF COPPER-SILICA .1. MODEL BASED ON INTERNAL STRESSES, WITH NO PLASTIC RELAXATION [J].

BROWN, LM ;

STOBBS, WM .

PHILOSOPHICAL MAGAZINE, 1971, 23 (185) :1185-&

← 1 2 3 4 5 6 →