Effect of Magnesium Alloy DE-GMAW Processing Parameters on Microhardness

2018 ◽  
pp. 119-127
Author(s):  
Jian Li ◽  
Yinshui He ◽  
Donghua Liu ◽  
Guohong Ma
Keyword(s):  
Magnesium Alloy ◽  
Processing Parameters

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.

Investigation of the Anti-Corrosion Ceramic Coating Formed on AZ91D Magnesium Alloy by Micro-Arc Oxidation

2007 ◽  
Vol 353-358 ◽  
pp. 1645-1648 ◽  
Author(s):  
Dong Chu Chen ◽  
Wen Fang Li ◽  
Jun Jie
Keyword(s):  
Magnesium Alloy ◽  
Ceramic Coating ◽  
Silicate Solution ◽  
Processing Parameters ◽  
Time Duration ◽  
Compact Structure ◽  
Az91d Magnesium Alloy ◽  
Micro Arc Oxidation ◽  
Coating Formation ◽  
And Performance

A new micro-arc oxidation method with a home-made asymmetric alternating-current (ac) power supply for forming an anti-corrosion ceramic coating on AZ91D magnesium alloy was presented, and two different silicate-based and aluminate-based preparing solutions were introduced to coating formation. The effect of many processing parameters on the growth and performance of the formed ceramic coating was investigated. It was found that the electrolyte concentration, current density, treating time duration and other parameters have significant influence on the coating morphology and anti-corrosion performance. Through the polarization curve test, it showed that the coating oxidized in silicate solution has better corrosion-resistance due to its continuous and compact structure than that formed in aluminate solution. The morphology and microstructure of the coating were analyzed through SEM, XRD technology. The coating consists of two layers, i.e., loose layer and compact layer. The compositions and phase structures varied with electrolytes, and it was found that the micro-arc oxidation coating prepared in silicate solution is composed of MgO and Mg2SiO4, while the coating prepared in aluminate is mainly composed of MgAl2O4.

Effect of Processing Parameters on Porosity and Bonding Strength in Supersonic Particles Deposition of Al-Si Alloy

2013 ◽  
Vol 721 ◽  
pp. 332-336
Author(s):  
Sheng Zhu ◽  
Yu Xiang Liu ◽  
Xiao Ming Wang ◽  
Guo Feng Han
Keyword(s):  
Magnesium Alloy ◽  
Bonding Strength ◽  
Processing Parameters ◽  
Air Pressure ◽  
Spray Distance

Effect of Supersonic Particles Deposition processing parameters on porosity and bonding strength of Al-Si coating on the surface of ZM5 Magnesium alloy was studied. The result shows that the porosity rates of Al-Si coating are all below 0.6% and the bonding strength is all above 35MPa. With air pressure increasing, the porosity of Al-Si coating reduces to below 0.3% and the bonding strength increases to above 40MPa. With spray distance increasing, the average percent voids of Al-Si coating tends to increase and the bonding strength is better between 160mm and 200mm. The minimum porosity and the maximal bonding strength of the coating can be reached when the speed of feeding powders is at 6r/s.

Influence of Laser Processing Parameters on Microstructure and Corrosion of Laser Surface Melted ZE41 Magnesium Alloy

2011 ◽  
Vol 690 ◽  
pp. 401-404
Author(s):  
Parama Chakraborty Banerjee ◽  
R.K. Singh Raman ◽  
Yvonne Durandet ◽  
Grant McAdam
Keyword(s):  
Magnesium Alloy ◽  
Laser Processing ◽  
Electrochemical Impedance ◽  
Processing Parameters ◽  
Laser Surface ◽  
Microstructural Refinement ◽  
Scan Rate ◽  
Beam Type ◽  
Electrochemical Characterisation ◽  
Scanning Electron

In the present study, surface melting of a magnesium alloy, ZE41, was performed with an Nd:YAG laser, using different laser parameters (scan rate and beam type). The microstructure of the laser treated and untreated specimens were characterised by optical and scanning electron microscopy. The degree of microstructural refinement and melt depth was found to be a function of the laser scan rate. Electrochemical characterisation of the different laser treated specimens along with the untreated alloy was performed using electrochemical impedance spectroscopy. The laser treated specimens and untreated alloy showed similar corrosion resistance.

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