Influence of extrusion parameters on microstructure, texture and mechanical properties of a low Mn and high-Ca containing Mg-2.9Zn-1.1Ca-0.5 Mn magnesium alloy
A newly developed low Mn and high-Ca containing magnesium alloy, Mg-2.9Zn-1.1Ca-0.5 Mn (wt.%) based alloy was processed by low-temperature extrusion. The average recrystallized grain size decreased from 1.64 to 0.58 μm with a decrease in the extrusion speed from 1 to 0.01 mm s−1, but increased to 2....
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Elsevier
2020-05-01
|
Series: | Journal of Materials Research and Technology |
Subjects: | |
Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785419318940 |
id |
doaj-ede7e78f91444c979f81182ab0aa4dd7 |
---|---|
record_format |
Article |
spelling |
doaj-ede7e78f91444c979f81182ab0aa4dd72020-11-25T03:19:38ZengElsevierJournal of Materials Research and Technology2238-78542020-05-019352645277Influence of extrusion parameters on microstructure, texture and mechanical properties of a low Mn and high-Ca containing Mg-2.9Zn-1.1Ca-0.5 Mn magnesium alloyK.B. Nie0Z.H. Zhu1K.K. Deng2J.G. Han3College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China; Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, China; Corresponding author.College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China; Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR ChinaA newly developed low Mn and high-Ca containing magnesium alloy, Mg-2.9Zn-1.1Ca-0.5 Mn (wt.%) based alloy was processed by low-temperature extrusion. The average recrystallized grain size decreased from 1.64 to 0.58 μm with a decrease in the extrusion speed from 1 to 0.01 mm s−1, but increased to 2.11 μm with increasing extrusion temperature from 270 to 350 ℃. The finest and uniform recrystallized grain structures with substantial nano-sized MgZn2 precipitates and α-Mn particles were obtained in the 270 ℃/0.01 mm s−1 sample. The texture intensity including basal (0002), prismatic type I (10−10) and prismatic type II (11–20) decreased accompanied by increasing the deformation temperature or extrusion speed. The weakest texture intensity for the 270 ℃/1 mm s−1 sample was derived from high degree of recrystallization, inhomogeneous recrystallized grain structure and the precipitates. Superior uniaxial tensile strength (yield strength of ∼352.5 MPa, ultimate tensile strength of ∼382.3 MPa and elongation of ∼7.1%) were achieved in the 270 ℃/0.01 mm s−1 sample. The improved yield strength was mainly ascribed to fine grain strengthening and precipitates strengthening relative to dislocation strengthening and back stress strengthening. A positive slope of work-hardening rate (dθ⁄dσ > 0) extruded at 270 ℃/0.01 mm s−1 was related to the sharp basal texture and insufficient slip. High θ value at stage IV after extrusion at 270 ℃/1 mm s−1 with abundant dimples and weak texture contributed to high ductility. Massive micro-cracks formed along the twins in the coarse deformed grains led to the failure during tension.http://www.sciencedirect.com/science/article/pii/S2238785419318940Mg-Zn-Ca-Mn alloyExtrusionUltrafine grainsTextureMechanical properties |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
K.B. Nie Z.H. Zhu K.K. Deng J.G. Han |
spellingShingle |
K.B. Nie Z.H. Zhu K.K. Deng J.G. Han Influence of extrusion parameters on microstructure, texture and mechanical properties of a low Mn and high-Ca containing Mg-2.9Zn-1.1Ca-0.5 Mn magnesium alloy Journal of Materials Research and Technology Mg-Zn-Ca-Mn alloy Extrusion Ultrafine grains Texture Mechanical properties |
author_facet |
K.B. Nie Z.H. Zhu K.K. Deng J.G. Han |
author_sort |
K.B. Nie |
title |
Influence of extrusion parameters on microstructure, texture and mechanical properties of a low Mn and high-Ca containing Mg-2.9Zn-1.1Ca-0.5 Mn magnesium alloy |
title_short |
Influence of extrusion parameters on microstructure, texture and mechanical properties of a low Mn and high-Ca containing Mg-2.9Zn-1.1Ca-0.5 Mn magnesium alloy |
title_full |
Influence of extrusion parameters on microstructure, texture and mechanical properties of a low Mn and high-Ca containing Mg-2.9Zn-1.1Ca-0.5 Mn magnesium alloy |
title_fullStr |
Influence of extrusion parameters on microstructure, texture and mechanical properties of a low Mn and high-Ca containing Mg-2.9Zn-1.1Ca-0.5 Mn magnesium alloy |
title_full_unstemmed |
Influence of extrusion parameters on microstructure, texture and mechanical properties of a low Mn and high-Ca containing Mg-2.9Zn-1.1Ca-0.5 Mn magnesium alloy |
title_sort |
influence of extrusion parameters on microstructure, texture and mechanical properties of a low mn and high-ca containing mg-2.9zn-1.1ca-0.5 mn magnesium alloy |
publisher |
Elsevier |
series |
Journal of Materials Research and Technology |
issn |
2238-7854 |
publishDate |
2020-05-01 |
description |
A newly developed low Mn and high-Ca containing magnesium alloy, Mg-2.9Zn-1.1Ca-0.5 Mn (wt.%) based alloy was processed by low-temperature extrusion. The average recrystallized grain size decreased from 1.64 to 0.58 μm with a decrease in the extrusion speed from 1 to 0.01 mm s−1, but increased to 2.11 μm with increasing extrusion temperature from 270 to 350 ℃. The finest and uniform recrystallized grain structures with substantial nano-sized MgZn2 precipitates and α-Mn particles were obtained in the 270 ℃/0.01 mm s−1 sample. The texture intensity including basal (0002), prismatic type I (10−10) and prismatic type II (11–20) decreased accompanied by increasing the deformation temperature or extrusion speed. The weakest texture intensity for the 270 ℃/1 mm s−1 sample was derived from high degree of recrystallization, inhomogeneous recrystallized grain structure and the precipitates. Superior uniaxial tensile strength (yield strength of ∼352.5 MPa, ultimate tensile strength of ∼382.3 MPa and elongation of ∼7.1%) were achieved in the 270 ℃/0.01 mm s−1 sample. The improved yield strength was mainly ascribed to fine grain strengthening and precipitates strengthening relative to dislocation strengthening and back stress strengthening. A positive slope of work-hardening rate (dθ⁄dσ > 0) extruded at 270 ℃/0.01 mm s−1 was related to the sharp basal texture and insufficient slip. High θ value at stage IV after extrusion at 270 ℃/1 mm s−1 with abundant dimples and weak texture contributed to high ductility. Massive micro-cracks formed along the twins in the coarse deformed grains led to the failure during tension. |
topic |
Mg-Zn-Ca-Mn alloy Extrusion Ultrafine grains Texture Mechanical properties |
url |
http://www.sciencedirect.com/science/article/pii/S2238785419318940 |
work_keys_str_mv |
AT kbnie influenceofextrusionparametersonmicrostructuretextureandmechanicalpropertiesofalowmnandhighcacontainingmg29zn11ca05mnmagnesiumalloy AT zhzhu influenceofextrusionparametersonmicrostructuretextureandmechanicalpropertiesofalowmnandhighcacontainingmg29zn11ca05mnmagnesiumalloy AT kkdeng influenceofextrusionparametersonmicrostructuretextureandmechanicalpropertiesofalowmnandhighcacontainingmg29zn11ca05mnmagnesiumalloy AT jghan influenceofextrusionparametersonmicrostructuretextureandmechanicalpropertiesofalowmnandhighcacontainingmg29zn11ca05mnmagnesiumalloy |
_version_ |
1724621091171729408 |