scholarly journals Structure, fluidity and mechanical property of semi-solid AZ91D magnesium alloy fabricated by pressure casting.

1994 ◽  
Vol 44 (1) ◽  
pp. 9-15 ◽  
Author(s):  
Akira YUASA ◽  
Shinji MATSUI ◽  
Shigeharu KAMADO ◽  
Yo KOJIMA
Keyword(s):  
Mechanical Property ◽  
Magnesium Alloy ◽  
Pressure Casting ◽  
Az91d Magnesium Alloy ◽  
Semi Solid

Effect of Holding Time on Microstructures of AZ91D Alloy by the Semi-Solid Thixo-Extruded Process

2015 ◽  
Vol 1088 ◽  
pp. 191-194
Author(s):  
Xiao Ping Zheng ◽  
Ze Sheng Ji ◽  
Wei Wen Zhang ◽  
Ming Shao
Keyword(s):  
Mechanical Property ◽  
Particle Size ◽  
Magnesium Alloy ◽  
Shape Factor ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Az91d Alloy ◽  
Az91d Magnesium Alloy ◽  
Semi Solid ◽  
The Relationship

The semi-solid thixo-extruded process of AZ91D magnesium alloy with 9 % plastic deformation was investigated. The effect of isothermal time on the thixo-extruded formability of AZ91D magnesium alloy was analyzed. The relationship between isothermal time and microstructure, mechanical property was also researched. The results showed that with increasing the isothermal time from zero to 60 min on 575 °C, the filling distance was increased firstly and then decreased, the solid volume fraction was decreased firstly and then increased, the tensile strength and elongation were also increased firstly and then decreased. However, the increasing isothermal time would lead to decrease of shape factor but the coarsening of particle size. When the isothermal time was 30 min, the solid volume fraction was lowest and the filling distance was greatly increased obviously.

Microstructure Evaluate System of Semi-Solid Forming

2007 ◽  
Vol 546-549 ◽  
pp. 93-96 ◽  
Author(s):  
Xiao Peng Cui ◽  
Yong Bing Liu ◽  
Zhan Yi Cao ◽  
You Fa Zhang ◽  
Qian Qian Zhang
Keyword(s):  
Magnesium Alloy ◽  
The Other ◽  
Microstructure Analysis ◽  
Analysis Software ◽  
Az91d Magnesium Alloy ◽  
Alloy Microstructure ◽  
Semi Solid

The evaluating rules for semi-solid microstructure were brought up, and the analysis software was developed on MATLAB 7.0 platform in this study. Furthermore, this system can be used not only in the Thixomolding AZ91D magnesium alloy microstructure analysis, but also in the other semi-solid processing microstructure.

Study on Semi-Solid Continuous Roll-Casting Strips of AZ91D Magnesium Alloy

2008 ◽  
pp. 469-473
Author(s):  
Shui Sheng Xie ◽  
You Feng He ◽  
Guo Jie Huang ◽  
Mao Peng Geng ◽  
Ying Zhang
Keyword(s):  
Magnesium Alloy ◽  
Az91d Magnesium Alloy ◽  
Roll Casting ◽  
Semi Solid

scholarly journals Semi-solid forming of strain-induced AZ91D magnesium alloy.

1995 ◽  
Vol 45 (10) ◽  
pp. 560-565 ◽  
Author(s):  
Kazutoshi SEKIHARA ◽  
Satoshi OHNISHI ◽  
Shigeharu KAMADO ◽  
Yo KOJIMA
Keyword(s):  
Magnesium Alloy ◽  
Az91d Magnesium Alloy ◽  
Semi Solid

Numerical Simulation of Thixoforging of an AZ91D Magnesium Alloy Magazine Plate and Experimental Validation

2008 ◽  
Vol 141-143 ◽  
pp. 623-628 ◽  
Author(s):  
Ju Fu Jiang ◽  
Ying Wang ◽  
Zhi Ming Du ◽  
Shou Jing Luo
Keyword(s):  
Numerical Simulation ◽  
Magnesium Alloy ◽  
Experimental Validation ◽  
Equivalent Strain ◽  
Technological Parameters ◽  
Billet Temperature ◽  
Az91d Magnesium Alloy ◽  
Punch Velocity ◽  
Die Temperature ◽  
Semi Solid

In this paper, thixoforging of a magazine plate made of AZ91D magnesium alloy were investigated by means of numerical simulation and experiments. Numerical simulation results show that with increasing punch displacement, local bending, formation of a concave shell part and bulk plastic deformation occurs in billet continuously. Equivalent strain and stress increase and the temperature of the semi-solid billet decreases. When the temperature of the semi-solid billet or the die temperature is elevated, equivalent stain and stress decrease. Optimal technological parameters such as a billet temperature of 545°C, die temperature of 450°C and punch velocity of 15 mm/s were obtained by numerical simulation. Experimental results demonstrate that magazine plates with high mechanical properties such as tensile strength of 316.8 MPa, yield strength of 228.3 MPa and elongation of 12.6 % can be manufactured successfully when the optimal technological parameters selected according to the results of numerical simulation are applied.

Study on Static Shear-Rheologic Characteristics of Semi-Solid AZ91D Magnesium Alloy by Reheating

2006 ◽  
Vol 116-117 ◽  
pp. 738-741
Author(s):  
Ze Sheng Ji ◽  
Mao Liang Hu ◽  
Xiao Ping Zheng
Keyword(s):  
Shear Stress ◽  
Magnesium Alloy ◽  
Critical Shear Stress ◽  
Critical Value ◽  
Holding Time ◽  
Az91d Magnesium Alloy ◽  
Coarse Grains ◽  
Small Grains ◽  
Semi Solid ◽  
Static Shear

Static shear-rheology for self-made semi-solid AZ91D magnesium alloy slurry was studied by using the tester and a universal electronic machine. Shear-stress along with cylindrical surface in the sample was produced by using the tester and then shear-rheologic deformation happened. It showed that on the condition of the same loading, the longer the loading time and holding time were, the larger the deforming rate was. When the holding time attained a certain value, small grains acquired enough energy to grow up or amalgamate with prolonging the holding time and coarse grains started to melt from intergranular or grain boundaries, but the critical shear-stress kept a constant. The sample didn’t flow but appeared to instantaneous shear-strains with starting to load. When the loading exceeded the critical value, the sample started to flow and had the phenomena of elastic after-working, elastic before-working and remained deformation. The rheologic characteristics of semi-solid AZ91D magnesium alloy were expressed by the five element mechanical model: H1—(N1/H2)—(N2/S).

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