Determination of Lower-Bound Ductility for AZ31 Magnesium Alloy by Use of the Bulge Specimens

2006 ◽  
Vol 129 (3) ◽  
pp. 407-413 ◽  
Author(s):  
Rimma Lapovok ◽  
Peter D. Hodgson
Keyword(s):  
Magnesium Alloy ◽  
Lower Bound ◽  
Magnesium Alloys ◽  
High Sensitivity ◽  
Processing Parameters ◽  
Industrial Applications ◽  
Compression Tests ◽  
Forming Technology ◽  
Element Simulation ◽  
The Moment

Despite the high demand for industrial applications of magnesium, the forming technology for wrought magnesium alloys is not fully developed due to the limited ductility and high sensitivity to the processing parameters. The processing window for magnesium alloys could be significantly widened if the lower-bound ductility (LBD) for a range of stresses, temperature, and strain rates was known. LBD is the critical strain at the moment of fracture as a function of stress state and temperature. Measurements of LBD are normally performed by testing in a hyperbaric chamber, which is highly specialized, complex, and rare equipment. In this paper an alternative approach to determine LBD is demonstrated using wrought magnesium alloy AZ31 as an example. A series of compression tests of bulge specimens combined with finite element simulation of the tests were performed. The LBD diagram was then deduced by backward calculation.

Constitutive Model of Thixotropic Plastic Forming for Semi-Solid AZ61 Magnesium Alloy

2006 ◽  
Vol 116-117 ◽  
pp. 639-642 ◽  
Author(s):  
Hong Yan ◽  
Bing Feng Zhou
Keyword(s):  
Magnesium Alloy ◽  
Volume Fraction ◽  
Testing Machine ◽  
Processing Parameters ◽  
Liquid Volume ◽  
Compression Tests ◽  
Liquid Volume Fraction ◽  
Az61 Magnesium Alloy ◽  
Az61 Alloy ◽  
Semi Solid

Uniaxial compression tests on semi-solid AZ61 alloy fabricated by stain-induced activation (SIMA) process and the conventional casts were carried out using the Gleedle-1500 dynamic material testing machine. The relationships between stress and stain were analyzed. The numerical relationships among processing parameters (strain rate z ε& strain z ε temperature T liquid volume fraction L f ) and stress were studied. The proposed constitutive equation was established for semi-solid AZ61 magnesium alloy using the multiple nonlinear regression method. A scientific basic provided for both numerical simulation of processing process of semi- solid AZ61 alloy and rational choice and control of processing parameters.

Ecological Joining Process of AZ31B Magnesium Alloy

2021 ◽  
Vol 890 ◽  
pp. 76-81
Author(s):  
Lia Nicoleta Boțilă ◽  
Radu Cojocaru ◽  
Victor Verbiţchi
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Industrial Applications ◽  
Low Density ◽  
High Corrosion Resistance ◽  
Metal Structures ◽  
Complex Metal ◽  
Magnesium Alloy Az31b ◽  
Joining Process

Due to their properties (low density, high corrosion resistance, easy to process), magnesium alloys are used in all important industrial fields (aeronautics, automotive, transport, etc.). Magnesium is the lightest metal for complex metal structures with a density 2-3 times lower than that of aluminum and a quarter than that of steel. The possibility of joining magnesium with other materials allows a greater flexibility in designing and increasing the number of applications for light alloys.This paper presents results obtained by ISIM Timisoara for FSW welding of magnesium alloy AZ31B. Considering the difficulties that arise when welding magnesium alloys using classical processes, it can be assumed that by applying the FSW process for joining these types of materials, the results obtained are very good and can substantiate industrial applications.

scholarly journals Thermally Induced Gradient of Properties on a Superhydrophobic Magnesium Alloy Surface

Metals ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 41
Author(s):  
Kirill A. Emelyanenko ◽  
Alexander G. Domantovsky ◽  
Elizaveta V. Chulkova ◽  
Alexandre M. Emelyanenko ◽  
Ludmila B. Boinovich
Keyword(s):  
Magnesium Alloy ◽  
Oxide Layer ◽  
Magnesium Oxide ◽  
Magnesium Alloys ◽  
Laser Processing ◽  
Prolonged Exposure ◽  
Industrial Applications ◽  
Alloy Surface ◽  
Internal Stresses ◽  
Nanosecond Laser

Fabrication of superhydrophobic coatings for magnesium alloys is in high demand for various industrial applications. Such coatings not only extend the service life of metal structures, but also impart additional useful functional properties to the coated surface. In this study, we show that nanosecond laser processing of long, thin stripes of magnesium alloys followed by the deposition of a hydrophobic agent onto the magnesium oxide layer is a simple, convenient, and easily reproducible method for obtaining superhydrophobic surfaces with property gradient along the sample. The mechanism of the gradient in wettability and electrochemical properties of the magnesium alloy surface is discussed based on the high-temperature growth of magnesium oxide and its following degradation. The latter is related to the development of internal stresses and the formation of cracks and pores within the oxide layer at prolonged exposure to high temperatures during the interaction of a laser beam with the substrate. The effect of heating during laser processing of magnesium materials with limited sizes on the protective properties of the forming coatings is elucidated.

Study on the Critical Damage Value and Processing Map of AZ80 Magnesium Alloy Forming at Elevated Temperatures

2013 ◽  
Vol 275-277 ◽  
pp. 1904-1910
Author(s):  
Yong Xue ◽  
Zhi Min Zhang ◽  
Yao Jin Wu
Keyword(s):  
Magnesium Alloy ◽  
Elevated Temperatures ◽  
Processing Parameters ◽  
Strain Rates ◽  
Processing Maps ◽  
Compression Tests ◽  
Az80 Magnesium Alloy ◽  
Dynamic Material Modeling ◽  
Az80 Alloy ◽  
Critical Damage

In the present research, a series of AZ80 magnesium alloy billets were compressed with 60% height reduction on hot process simulator at temperatures of 473,523,573,623,673,723K under strain rates of 0.001, 0.01, 0.1,1 and 10s-1. The value of the Cockcroft-Latham equation, i.e. critical damage value, was calculated from the finite element calculations for the compression tests. The results show that the critical damage value is not a constant but varies in a range from 0.1397 to 0.4653. Meanwhile, the processing maps based on the Dynamic Material Modeling (DMM) were constructed. From the processing maps, the optimal deformation processing parameters are the deformation temperatures ranging from 573 to 623K and strain rates ranging from 0.001 to 0.01s-1 in view of improving the mechanical properties of AZ80 alloy component.

Multifactor mathematical model of criticality of welding process of products from aluminum- magnesium alloys

2020 ◽  
pp. 12-18
Author(s):  
F.A. Urazbahtin ◽  
A.YU. Urazbahtina
Keyword(s):  
Mathematical Model ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Welding Process ◽  
Welding Equipment ◽  
Equipment Operation ◽  
Aluminum Magnesium Alloys ◽  
Aluminum Magnesium Alloy ◽  
Welding Materials

A multifactor mathematical model of the welding process of products from aluminum-magnesium alloys, consisting of 71 indicators that assess the quality of the weld, the welding process, costs, equipment operation and quality of the welded material. The model can be used to control and optimize the welding process of products from aluminum-magnesium alloys. Keywords welding, products, aluminum-magnesium alloy, indicators, process parameters, welding equipment, welding materials, electrode sharpening, lining [email protected]

Sign in / Sign up

Export Citation Format

Share Document