scholarly journals Mechanical properties of ZEK100 Mg alloy

2021 ◽  
Author(s):  
Yuntao Li
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Stress Ratio ◽  
Stress Amplitude ◽  
Aerospace Industry ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Fatigue Properties ◽  
Lightweight Structure ◽  
Equiaxed Grains

Low rare-earth containing magnesium (Mg) alloys are considered lightweight structure materials and are wildly used in automotive and aerospace industry. Tensile and fatigue behaviors are two important mechanical properties of metallic alloys. This research focused on the tensile and fatigue properties of ZEK100 Mg alloys. Microstructure of ZEK100 alloy contained equiaxed grains and exhibited relatively weaker texture compared with other RE-free Mg alloys. During tensile test, as the strain rate increased, yield stress, ultimate tensile strength and hardening capacity increased, but the elongation decreased. Strain rate was found to influence tensile properties of ZEK100 Mg alloy. The stress controlled fatigue test showed that as the stress ratio increased, the stress amplitude and the fatigue life both decreased. Fatigue crack was observed to initiate from specimen surface, and crack propagation was characterized by fatigue striations.

scholarly journals Mechanical properties of ZEK100 Mg alloy

2021 ◽  
Author(s):  
Yuntao Li
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Stress Ratio ◽  
Stress Amplitude ◽  
Aerospace Industry ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Fatigue Properties ◽  
Lightweight Structure ◽  
Equiaxed Grains

Low rare-earth containing magnesium (Mg) alloys are considered lightweight structure materials and are wildly used in automotive and aerospace industry. Tensile and fatigue behaviors are two important mechanical properties of metallic alloys. This research focused on the tensile and fatigue properties of ZEK100 Mg alloys. Microstructure of ZEK100 alloy contained equiaxed grains and exhibited relatively weaker texture compared with other RE-free Mg alloys. During tensile test, as the strain rate increased, yield stress, ultimate tensile strength and hardening capacity increased, but the elongation decreased. Strain rate was found to influence tensile properties of ZEK100 Mg alloy. The stress controlled fatigue test showed that as the stress ratio increased, the stress amplitude and the fatigue life both decreased. Fatigue crack was observed to initiate from specimen surface, and crack propagation was characterized by fatigue striations.

Effect of Nd on Microstructures and Properties of AZ31 Wrought Mg Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 301-304
Author(s):  
Wei Qiu ◽  
En Hou Han ◽  
Lu Liu
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Mg Alloys ◽  
The Other ◽  
Mg Alloy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microstructures And Mechanical Properties ◽  
Re Elements

Addition of RE elements to Al-containing Mg alloys can improve properties of Mg alloys at elevated temperatures. In the present investigation, hot-extruded AZ31+x%Nd. (x=0.1,0.3,0.6and1.0 wt%) wrought Mg alloy were prepared .The effects of Nd on microstructures and mechanical properties at room temperature of new alloy were investigated. The investigation found that Nd can bring about two kind of precipitation phases . One is AlNd phase, the other is AlNdMn phase, which were identified as Al11Nd3 and Al8NdMn4 by X-ray diffraction and TEM.

Application of High-Pressure Sliding for Grain Refinement of Al and Mg Alloys

2010 ◽  
Vol 667-669 ◽  
pp. 91-96 ◽  
Author(s):  
Kiyonari Tazoe ◽  
Shuji Honda ◽  
Z. Horita
Keyword(s):  
High Pressure ◽  
Strain Rate ◽  
Grain Refinement ◽  
High Pressure Torsion ◽  
Initial Strain Rate ◽  
Mg Alloys ◽  
Initial Strain ◽  
Mg Alloy ◽  
Al Alloy ◽  
Average Grain Size

An earlier study showed that high-pressure sliding (HPS) is effective for grain refinement of pure Al in a rectangular sheet form using the principle of high-pressure torsion. In this study, the HPS is applied for grain refinement of an Al-3%Mg-0.2%Sc alloy and an AZ61 Mg alloy. HPS was conducted under a pressure of 1 GPa with sliding distances of 10 to 30 mm at room temperature for the Al alloy and at 473 K for the Mg alloy The average grain size is ~300 nm for both the Al and Mg alloys, respectively. Tensile tests showed that a superplastic elongation of ~1500% is achieved in the Al-3%Mg-0.2%Sc alloy at 573 K with an initial strain rate of 3.3x10-3 s-1 and of ~600% in the AZ61 alloy at 573 K with an initial strain rate of 1x10-3 s-1.

Influence of Mg Content, Grain Size and Strain Rate on Mechanical Properties and DSA Behavior of Al-Mg Alloys Processed by ECAP and Annealing

2014 ◽  
Vol 794-796 ◽  
pp. 870-875 ◽  
Author(s):  
Min Zha ◽  
Yan Jun Li ◽  
Ragnvald H. Mathiesen ◽  
Christine Baumgart ◽  
Hans J. Roven
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Strain Rate ◽  
Room Temperature ◽  
Uniform Elongation ◽  
Mg Alloys ◽  
Lower Strain Rate ◽  
Lower Strain ◽  
Mg Content ◽  
Al Mg Alloys

Ultrafine-grained (UFG) binary Al-xMg (x=1, 5 and 7 wt %) alloys were processed by equal channel angular pressing (ECAP) at room temperature via route Bccombined with inter-pass annealing. The effects of Mg content, grain size and strain rate on mechanical properties and dynamic strain aging (DSA) behaviour of the Al-Mg alloys upon tensile testing at room temperature were studied. An increase in Mg content from 5 to 7 wt % leads to a pronounced increase in strength and uniform elongation in both the as-homogenized and as-ECAP Al-Mg alloys. Thereby, the Al-7Mg alloy, either prior to or after ECAP processing, possess significantly higher strength and comparable or even higher uniform elongation than the more dilute Al-Mg alloys. However, the as-ECAP Al-Mg alloys exhibit significantly higher strength but little work hardening and hence rather limited uniform elongation. In general, decreasing grain size leads to significant increase in strength while dramatic decrease in ductility. Moreover, DSA serration amplitudes increase with reducing grain size in the micrometer range. However, the UFG Al-Mg alloys exhibit much less DSA effect than the micrometer scaled grain size counterparts, i.e. probably due to the high dislocation densities and special grain boundary features in the UFG materials. Also, the Al-Mg alloys, especially those with a UFG structure, exhibit higher strength and ductility at lower strain rate than at higher strain rate, due mainly to enhanced DSA effect and hence work hardening at a lower strain rate.

Development of Environment-Friendly CaO Added AZ31 Mg Alloy

2007 ◽  
Vol 124-126 ◽  
pp. 1481-1484 ◽  
Author(s):  
Jin Kyu Lee ◽  
Young Ok Yoon ◽  
Shae K. Kim
Keyword(s):  
Mechanical Properties ◽  
Ignition Temperature ◽  
Sulfur Hexafluoride ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Environment Friendly ◽  
Hfc 134A ◽  
Az31 Mg Alloy ◽  
Protective Cover ◽  
Oxidation Behaviors

Molten Mg alloys burn rapidly in air if not protected. In order to handle molten Mg safely, the molten metal should be protected from oxidation by covering the surface with flux or protective gases. Sulfur hexafluoride (SF6) gas is widely used for Mg alloy as a cover gas and has proved to be a successful inhibitor. However, the use of SF6 gas is limited because of its high cost and its significant impact on global warming potential (GWP). Therefore, SF6 gas is being replaced by alternative protection gases such as tetrafluoro ethane (HFC-134a) and 3M NovecTM 612. These gases are less expensive and have lower GWP, compared with SF6 gas. Recent studies show that there has been another attempt by adding CaO into Mg alloys to manufacture CaO added AZ31Mg alloy in terms of increasing ignition temperature and reducing protective cover gas amount during melting and casting. This paper discusses effect of CaO on ignition and oxidation behaviors of AZ31 Mg alloy as well as on surface roughness and mechanical properties of AZ31 Mg alloy extruded bars.

Effects of strain rate on mechanical properties and failure mechanism of structural Al–Mg alloys

2008 ◽  
Vol 492 (1-2) ◽  
pp. 283-292 ◽  
Author(s):  
M.J. Hadianfard ◽  
R. Smerd ◽  
S. Winkler ◽  
M. Worswick
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Failure Mechanism ◽  
Mg Alloys ◽  
Al Mg Alloys

Effect of CaO Content on Yb: YAG Disk Laser Weldability of AZ31 Mg Alloy

2014 ◽  
Vol 804 ◽  
pp. 31-34 ◽  
Author(s):  
Min Jung Kang ◽  
Cheol Hee Kim
Keyword(s):  
Mechanical Properties ◽  
Specific Gravity ◽  
Laser Welding ◽  
Oxidation Resistance ◽  
Magnesium Alloys ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Weld Strength ◽  
Shielding Gas ◽  
Az31 Mg Alloy

Magnesium alloys have recently attracted increased attention as structural materials owing to their low specific gravity. However, they must typically be casted, formed, melted, and even heated under a protective shielding gas to prevent them from oxidizing and igniting. So-called “ECO-Mg” alloys have recently been developed by adding CaO to conventional Mg alloys. ECO-Mg alloys exhibit higher oxidation resistance during melting and superior castability, even when beryllium is not added or toxic protective gasses such as SF6are not used. We laser-welded AZ31 Mg alloys with various CaO contents and examined the mechanical properties of the welds. Increasing the CaO content in the AZ31 increased the burning resistance of the ECO-Mg alloys, thereby suppressing plume generation during laser welding; thus the ECO-Mg alloy welds could be fully penetrated faster than conventional Mg alloy welds. The weld strength also increased with increasing CaO content in the AZ31 because the CaO refined the grains.

CW CO2 Laser Welding of Al-Mg Alloys with Filler Wires

2008 ◽  
Vol 580-582 ◽  
pp. 539-542 ◽  
Author(s):  
Jong Won Yoon ◽  
E.R. Wallach
Keyword(s):  
Weld Metal ◽  
Mg Alloys ◽  
Solidification Cracking ◽  
Solidification Structure ◽  
Mg Alloy ◽  
Weld Strength ◽  
Laser Welds ◽  
Equiaxed Grains ◽  
Mg Content ◽  
Al Mg Alloys

The CW CO2 laser weldability of various Al-Mg alloys was investigated in terms of weld strength, ductility, Vickers hardness, formability and solidification cracking tendency when both autogenous and wire feed welding were made. Tensile strength of the laser welds was lower than that of the corresponding base metals, and it was linearly proportional to the Mg content of the weld metal. Formability and ductility of Al-Mg alloy laser welds were lower than those of corresponding base alloys as well. As for the weld solidification structure, as the Mg content increased in the weld metal, more equiaxed grains developed. Hence, softening of weld metal and solidification cracking were decreased in the weld metal containing higher Mg. Solidification cracking of Al-Mg alloy laser welds showed the highest susceptibility at 1.6 to 1.9wt.% Mg, and it decreased with further increase of Mg content.

The Formability and Hot Stamping of Magnesium Alloy Sheets

2014 ◽  
Vol 1063 ◽  
pp. 215-218 ◽  
Author(s):  
Guang Sheng Huang ◽  
Li Fei Wang ◽  
Fu Sheng Pan ◽  
Ming Tu Ma
Keyword(s):  
Magnesium Alloy ◽  
Strain Rate ◽  
Hot Stamping ◽  
Alloy Sheet ◽  
Mg Alloys ◽  
Mg Alloy ◽  
Az31 Magnesium Alloy ◽  
Blank Holder Force ◽  
Blank Holder ◽  
Cold Stamping

Mg alloy is a potential material to be used in automobile, especially in the stamping products. Through texture weakening, temperature increasing, strain rate decreasing, blank holder force controlling, lubrication choosing and so on, the formability of AZ31 magnesium alloy is improved so that the cold stamping on some simple products can be conducted. However, on the complicated products, hot stamping should be considered. Temperature has an important effect on the formability of Mg alloy sheet. As the temperature increasing, the strength of Mg alloys sheet decreases while the formability increases. Hot stamping process is an effective way to broaden the using of Mg alloys.

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