On the High Formability of AZ31-0.5Ca Magnesium Alloy

In this work, we investigated the effect of Ca on the formability of the AZ31 Mg alloy. For this purpose, the microstructure, texture, mechanical properties and formability of AZ31 Mg alloy samples containing 0.5 wt. % Ca (AZ31-0.5Ca) were studied. For comparison, the performance of Ca-Free AZ31 alloy samples with similar grain size was also investigated. In addition, formability of this alloy was reached at a high punch speed. The results of this work showed that the addition of 0.5 wt. % Ca can enhance the formability of the AZ31 alloy, which was three times greater than that of the Ca-Free AZ31 alloy. The improved formability was attributed to the formation of (Mg,Al)2Ca particles (~1 μm), which, in turn, contribute to reducing the intensity of the strong basal texture during the primary processing of the alloy. The in-grain misorientation axis analysis determined by electron back-scattered diffraction and critical resolved shear stress calculations carried out by the viscoplastic self-consistent model showed that the non-basal slip systems could be activated in the AZ31-0.5Ca alloy.

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Localization of Stresses in Polycrystalline Grains Measured by Neutron Diffraction and Predicted by Self-Consistent Model

Materials Science Forum ◽

10.4028/www.scientific.net/msf.681.103 ◽

2011 ◽

Vol 681 ◽

pp. 103-108

Author(s):

Anita Gaj ◽

Lea le Joncour ◽

Andrzej Baczmanski ◽

Sebastian Wroński ◽

Benoit Panicaud ◽

...

Keyword(s):

Neutron Diffraction ◽

Load Transfer ◽

Diffraction Method ◽

Lattice Strains ◽

Consistent Model ◽

Self Consistent ◽

Main Component ◽

Critical Resolved Shear Stress ◽

Elastic Lattice

Time of flight neutron diffraction method was applied to measure elastic lattice strains in austenitic steel during "in situ" tensile test. Comparing experimental data with self-consistent model, the critical resolved shear stress and hardening parameters were determined for polycrystalline grains. The result allowed us to determine the main component of the stress localization tensor, relating the rate of grain stress with the applied macrostress rate. The evolution of concentration tensor in function of the applied macrostress was analyzed. Finally, the load transfer between grains during yielding of the sample was studied.

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Effect of the electropulsing on mechanical properties and microstructure of an ECAPed AZ31 Mg alloy

Journal of Materials Research ◽

10.1557/jmr.2008.0204 ◽

2008 ◽

Vol 23 (6) ◽

pp. 1570-1577 ◽

Cited By ~ 28

Author(s):

X.N. Du ◽

S.M. Yin ◽

S.C. Liu ◽

B.Q. Wang ◽

J.D. Guo

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Az31 Alloy ◽

Mg Alloy ◽

Microstructure Development ◽

Grain Sizes ◽

Angular Pressing ◽

Az31 Mg Alloy ◽

Structures And Properties ◽

Elongation To Failure

The mechanical properties and corresponding microstructure development of the AZ31 Mg alloy after treatment with equal channel angular pressing (ECAP) and subsequent electropulsing (ECP) was investigated. Comparing the ECAP+ECP-treated AZ31 alloy with the ECAP-treated alloy, the elongation to failure was improved significantly, while the yield stress and the ultimate tensile strength were not decreased, the grain sizes were slightly increased and more homogeneous, and the texture was barely changed. The main mechanism for the evolution of the structures and properties might be ascribed to the increased nucleation rate on recrystallization and the decreased dislocation density during the ECP treatment. It was reasonable to expect that the ECAP+ECP treatment would provide a promising approach for enhancing the mechanical properties of the Mg alloys.

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An electron back-scattered diffraction study on the microstructure evolution of AZ31 Mg alloy during equal channel angular extrusion

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2006.02.018 ◽

2006 ◽

Vol 426 (1-2) ◽

pp. 148-154 ◽

Cited By ~ 25

Author(s):

Li Jin ◽

Dongliang Lin ◽

Dali Mao ◽

Xiaoqin Zeng ◽

Wenjiang Ding

Keyword(s):

Diffraction Study ◽

Microstructure Evolution ◽

Equal Channel Angular Extrusion ◽

Mg Alloy ◽

Az31 Mg Alloy ◽

Angular Extrusion ◽

Electron Back Scattered Diffraction

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Effect of Final Rolling Temperature on Microstructures and Mechanical Properties of AZ31 Alloy Sheets Prepared by Equal Channel Angular Rolling and Continuous Bending

Materials ◽

10.3390/ma13153346 ◽

2020 ◽

Vol 13 (15) ◽

pp. 3346 ◽

Cited By ~ 1

Author(s):

Laixin Shi ◽

Lei Liu ◽

Li Hu ◽

Tao Zhou ◽

Mingbo Yang ◽

...

Keyword(s):

Mechanical Properties ◽

Texture Component ◽

Rolling Temperature ◽

Mg Alloy ◽

Basal Texture ◽

Double Peaks ◽

Final Rolling Temperature ◽

Az31 Mg Alloy ◽

Continuous Bending ◽

Final Rolling

The effects of final rolling temperature on the microstructures, texture and mechanical properties of AZ31 Mg alloy sheets prepared by equal channel angular rolling and continuous bending (ECAR-CB) were investigated. Extension twins {10–12} could be observed in the ECAR-CB deformed sheets. The increase in the number of {10–12} extension twins with increasing final rolling temperature might be attributed to the larger grain size and faster grain boundary migration. For all the ECAR-CB sheets at different final rolling temperatures, the deformation texture contains a basal texture component and a prismatic texture component, whereas the annealing recrystallization texture becomes a non-basal (pyramidal) texture with double peaks tilting away from normal direction (ND) to rolling direction (RD). With increasing final rolling temperature, the tilted angle of double peaks of annealing recrystallization non-basal texture increases. In addition, the plasticity and formability of ECAR-CB-A (ECAR-CB and then annealing) AZ31 Mg alloy sheets at room temperature can be improved by increasing the final rolling temperature.

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The Hardening in Alloys and Composites and Its Examination with a Diffraction and Self-Consistent Model

Fatigue of Aircraft Structures ◽

10.2478/fas-2018-0003 ◽

2018 ◽

Vol 2018 (10) ◽

pp. 31-46

Author(s):

Elżbieta Gadalińska ◽

Andrzej Baczmański ◽

Sebastian Wroński ◽

Mirosław Wróbel ◽

Christian Scheffzük

Keyword(s):

Tensile Test ◽

Stress Measurement ◽

Hardening Process ◽

Consistent Model ◽

Self Consistent ◽

Hardening Parameter ◽

Critical Resolved Shear Stress ◽

The Impact

Abstract The paper presents the results of diffraction stress measurement in Al/SiC composite and in 2124T6 aluminum alloy during the in situ tensile test. The main aim of the work is to observe the stress values for different stages of tensile test for the composite after applying two types of thermal treatment and for the alloy used as a matrix in this composite, to identify the type of hardening process. The experimental results were compared against the calculations results obtained from the self-consistent model developed by Baczmański [1] - [3] to gain the information about the micromechanical properties (critical resolved shear stress τcr and hardening parameter H) of the examined materials. This comparison allowed researchers to determine the role of reinforcement in the composite as well as the impact of the heat treatment on the hardening of the material.

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A Further Improvement in the Room-Temperature Formability of Magnesium Alloy Sheets by Pre-Stretching

Materials ◽

10.3390/ma13112633 ◽

2020 ◽

Vol 13 (11) ◽

pp. 2633 ◽

Cited By ~ 2

Author(s):

Umer Masood Chaudry ◽

Kotiba Hamad ◽

Jung-Gu Kim

Keyword(s):

Magnesium Alloy ◽

Strain Hardening ◽

Basal Slip ◽

Room Temperature ◽

Slip Systems ◽

Basal Texture ◽

Homogeneous Microstructure ◽

Enhanced Strain ◽

Grain Misorientation

Pre-stretching experiments were carried out on AZ31–0.5Ca magnesium alloy to alter the microstructure and texture for enhancing room-temperature formability. Compared to as-received alloy, the formability of a 5%-stretched sample was improved by 15%. This was attributed to enhanced strain hardening capability related to the weakening of basal texture and less homogeneous microstructure. In addition, in-grain misorientation axis analysis performed on the samples (as-received and stretched) also confirmed the higher activity of the non-basal slip systems in the 5%-stretched sample.

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Ca-induced Plasticity in Magnesium Alloy: EBSD Measurements and VPSC Calculations

Crystals ◽

10.3390/cryst10020067 ◽

2020 ◽

Vol 10 (2) ◽

pp. 67 ◽

Cited By ~ 4

Author(s):

Umer Masood Chaudry ◽

Kotiba Hamad ◽

Jung-Gu Kim

Keyword(s):

Shear Stress ◽

Magnesium Alloy ◽

Slip System ◽

Basal Slip ◽

Room Temperature ◽

Prismatic Slip ◽

Slip Systems ◽

Electron Backscattered Diffraction ◽

Self Consistent ◽

Critical Resolved Shear Stress

In the present work, Ca-induced plasticity of AZ31 magnesium alloy was studied using electron backscattered diffraction (EBSD) measurements supported by viscoplastic self-consistent (VPSC) calculations. For this purpose, alloy samples were stretched to various strains (5%, 10%, and 15%) at room temperature and a strain rate of 10−3 s−1. The EBSD measurements showed a higher activity of non-basal slip system (prismatic slip) as compared to that of tension twins. The VPSC confirmed the EBSD results, where it was found that the critical resolved shear stress of the various slip systems and their corresponding activities changed during the stretching of the alloy samples.

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