Role of self-inoculants in solidification process of AZ91D magnesium alloy

2011 ◽  
Author(s):  
Yuandong Li ◽  
Junfeng Qu ◽  
Bo Xing ◽  
Ying Ma ◽  
Tijun Chen
Keyword(s):  
Magnesium Alloy ◽  
Solidification Process ◽  
Az91d Magnesium Alloy

Microstructure and Properties of MAO Coatings for AZ91D Magnesium Alloy in Varies Work Mode

2013 ◽  
Vol 747-748 ◽  
pp. 178-183 ◽  
Author(s):  
Xue Jun Cui ◽  
Xiu Zhou Lin ◽  
Chun Hai Liu ◽  
Rui Song Yang ◽  
Ming Tian Li
Keyword(s):  
Magnesium Alloy ◽  
Orthogonal Experiment ◽  
Constant Current ◽  
Optimum Process ◽  
Az91d Magnesium Alloy ◽  
Experiment Method ◽  
Micro Arc Oxidation ◽  
Orthogonal Experiment Method ◽  
Power Mode

Micro arc oxidation coatings were prepared on AZ91D magnesium alloy in order to evaluate the role of electrical parameters under different work mode. Taking HV hardness and pit corrosion time as investigation index, the optimum process parameters were obtained through orthogonal experiment method. The morphology of coating was observed by scanning electron microscopy (SEM). The results showed that the coatings with dense and few micro pores can be obtained under constant current and power mode, and this kind coatings are of good corrosion resistance and have HV micro-hardness compared with those under constant voltage mode.

A Simplified CA Method for Simulating the Microstructure of Magnesium Alloy Components

2007 ◽  
Vol 561-565 ◽  
pp. 1797-1800 ◽  
Author(s):  
Liang Huo ◽  
Zhi Qiang Han ◽  
Zhi Yong Liu ◽  
Bai Cheng Liu
Keyword(s):  
Magnesium Alloy ◽  
Solidification Process ◽  
Eutectic Structure ◽  
Competitive Growth ◽  
Az91d Magnesium Alloy ◽  
Ca Model ◽  
Simulation Results ◽  
Evolution Of Microstructure ◽  
Crystallographic Orientations ◽  
Good Agreement

In this paper, a simplified cellular automaton (CA) model was proposed for modeling the evolution of microstructure in solidification process of AZ91D magnesium alloy. Since the calculation time was significantly reduced, it might be used to predict the microstructure field of a real Mg component after solidification. The stochastic nucleation, competitive growth processes of many grains with various crystallographic orientations and the formation of eutectic structure were also taken into account. Furthermore, step castings were poured with sand and permanent molds and metallographic experiments were carried out for validating the developed models. It was shown that the simulation results are in good agreement with those obtained in the experiments.

scholarly journals The Joint Characteristics of Friction Stir Welded AZ91D Magnesium Alloy

2003 ◽  
Vol 44 (5) ◽  
pp. 917-923 ◽  
Author(s):  
Won-Bae Lee ◽  
Jong-Woong Kim ◽  
Yun-Mo Yeon ◽  
Seung-Boo Jung
Keyword(s):  
Magnesium Alloy ◽  
Friction Stir ◽  
Az91d Magnesium Alloy ◽  
Joint Characteristics

High energy impact techniques application for surface grain refinement in AZ91D magnesium alloy

2008 ◽  
Vol 43 (13) ◽  
pp. 4658-4665 ◽  
Author(s):  
Li-feng Hou ◽  
Ying-hui Wei ◽  
Bao-sheng Liu ◽  
Bing-she Xu
Keyword(s):  
Magnesium Alloy ◽  
Grain Refinement ◽  
High Energy ◽  
Az91d Magnesium Alloy ◽  
Energy Impact

scholarly journals Investigations into stress corrosion cracking behaviour of AZ91D magnesium alloy in physiological environment

2011 ◽  
Vol 10 ◽  
pp. 518-523 ◽  
Author(s):  
Lokesh Choudhary ◽  
Jeremy Szmerling ◽  
Robert Goldwasser ◽  
R.K. Singh Raman
Keyword(s):  
Magnesium Alloy ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Az91d Magnesium Alloy

Room Temperature Screw Form Rolling of AZ91D Magnesium Alloy through Processing by Extrusion-Torsion Simultaneous Working

2014 ◽  
Vol 783-786 ◽  
pp. 375-379
Author(s):  
Mitsuaki Furui ◽  
Shouyou Sakashita ◽  
Kazuya Shimojima ◽  
Tetsuo Aida ◽  
Kiyoshi Terayama ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Room Temperature ◽  
Hardness Measurement ◽  
Rolling Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Az91d Magnesium Alloy ◽  
Microstructure Observation ◽  
Fine Grain ◽  
Simultaneous Processing

Extrusion-torsion simultaneous processing is a very attractive technique for fabricating a rod-shape material with fine grain and random texture. We have proposed a new screw form rolling process combined with preliminary extrusion-torsion simultaneous working. Microstructure evolution and mechanical property change of AZ91D magnesium alloy during extrusion-torsion simultaneous processing was examined through microstructure observation, X-ray diffraction analysis and micro-Vickers hardness measurement. By the addition of torsion, the crystal orientation of AZ91D magnesium alloy workpiece was drastically changed from basal crystalline orientation to the random orientation. Crystal grain occurred through the dynamic recrystallization and tended to coarsen with an increase of extrusion-torsion temperature. Grain refinement under 2 um was achieved at the lowest extrusion-torsion temperature of 523 K. M8 gauge AZ91D magnesium alloy screw was successfully formed at room temperature using the extrusion-twisted workpiece preliminary solution treating at 678 K for 345.6 ks. It was found that the extrusion-torsion temperature of 678 K must be selected to fabricate the good screw without any defects.

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