scholarly journals Friction Stir Weldability of High Tensile Strength Mg-Zn-Al-Ca-La Magnesium Alloy Consisted of Fine Grain

2008 ◽  
Vol 72 (7) ◽  
pp. 538-543 ◽  
Author(s):  
Naotsugu Yamamoto ◽  
Jinsun Liao ◽  
Kazuhiro Nakata
Keyword(s):  
Tensile Strength ◽  
Magnesium Alloy ◽  
High Tensile Strength ◽  
Friction Stir ◽  
Fine Grain

Fatigue of Friction Stir and GTAW Welded AZ31B Magnesium Alloy

2012 ◽  
Author(s):  
J. A. Ávila ◽  
H. E. Jaramillo ◽  
F. Franco
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Solid State ◽  
Magnesium Alloy ◽  
Mechanical Behavior ◽  
Arc Welding ◽  
Az31b Magnesium Alloy ◽  
Friction Stir ◽  
Gas Tungsten Arc ◽  
Hardness Tests

The mechanical behavior of butt welds made on AZ31B magnesium alloy plates by solid-state friction stir welding (FSW) and gas tungsten arc welding (GTAW) is presented. Fatigue, tensile strength, and hardness tests were performed. Also, fractographic analyses of the weld microstructures were conducted. Tests results show that the fatigue performance of FSW joints was superior to that of conventional welding (GTAW).

The Development of Annealing Time for Super Fine Grain and High Strength IF Steel

2013 ◽  
Vol 631-632 ◽  
pp. 613-616 ◽  
Author(s):  
Hong Mei Zhang ◽  
Li Feng Qiao
Keyword(s):  
Tensile Strength ◽  
High Strength ◽  
Strain Ratio ◽  
Continuous Annealing ◽  
High Tensile Strength ◽  
Plastic Strain Ratio ◽  
Fine Grain ◽  
New Type ◽  
High Strength If Steel ◽  
Annealing Experiments

The hot rolling, cold rolling and simulative continuous annealing experiments were carried out in the laboratory on the base of new type SFG HSS (super fine grain, high strength steel sheet). The results show that the microstructure which contains a number of cake shaped grain can be refined and homogenized by the feasible annealing holding time. Contrast to the conventional steel, the SFG steel have the characters of super fine grain, high tensile strength, low yield strength/tensile strength rate, good elongation and high r-value high（the plastic strain ratio）．

Corrosion Resistance of RE-AZ91 Magnesium Alloys

2014 ◽  
Vol 933 ◽  
pp. 66-70
Author(s):  
Jun Jie Yang ◽  
Yao Li ◽  
Ping Xue
Keyword(s):  
Tensile Strength ◽  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Mg Alloy ◽  
Constant Voltage ◽  
High Tensile Strength ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium ◽  
Good Heat Resistance ◽  
Good Heat

Rare Earth (RE) were added to industrial AZ91 magnesium alloy, so that RE-AZ91 Mg alloy was produced by the process of die casting, so as to study the effect of RE on corrosion resistance and tensile strength of Mg alloy. The experiment results show that RE addition could improve the tensile strength and corrosion resistance of magnesium alloy at a certain amount of RE. RE-AZ91 had a good heat resistance, corrosion resistance at a high temperature or in the environment applied constant voltage, with a high tensile strength.

Experimental investigation and optimization of quality characteristics during friction stir welding of Al- and Zn-based magnesium alloy using artificial intelligence

2021 ◽  
pp. 146442072110448
Author(s):  
Pradeep K Yadav ◽  
Manoj K Khurana
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Friction Stir Welding ◽  
Magnesium Alloy ◽  
Impact Strength ◽  
Optimization Technique ◽  
Absolute Error ◽  
Statistical Parameters ◽  
Percentage Elongation ◽  
Friction Stir

Friction stir welding is successfully used to weld different wrought magnesium alloys. This work investigated the mechanical and microstructural behavior of the friction stir-welded AZ31B magnesium alloy. The experiments were conducted as per experimental runs designed by response surface methodology. An artificial neural network model was developed to produce a relationship between process variables (tool rotational speed, welding speed, and tool shoulder diameter) and characteristics of the friction stir-welded joints (tensile strength, percentage elongation, impact strength, microhardness, and grain size). The acceptable range of statistical parameters validated the adequacy of the model. The multi-objective optimization technique, genetic algorithm was used to obtain a set of Pareto optimal solutions. The best-compromised optimum solution for maximum tensile strength (164.2 MPa), percentage elongation (8%) impact strength (3.5 J), microhardness (85 Hv), and minimum grain size (13.1 μm) was validated by confirmation test with <3 percent absolute error percentage. The fractographical analysis has been performed and dimples and torn edges observed in fracture zones.

Multi Response Optimization of Process Parameters using Taguchi based Grey Relational Method in FSW of AZ91B Magnesium Alloy

2021 ◽  
Vol 13 (4) ◽  
Author(s):  
M.A. Unnikrishnan ◽  
J. Edwin Raja Dhas
Keyword(s):  
Tensile Strength ◽  
Magnesium Alloy ◽  
Taguchi Method ◽  
Grey Relational Analysis ◽  
Welding Process ◽  
Welding Parameters ◽  
Friction Stir ◽  
Relational Analysis ◽  
Optimization Of Process Parameters ◽  
Grey Relational

In this paper, the Taguchi method and grey relational analysis have been used to evaluate the weldability of AZ91B Magnesium alloy by friction stir welding process. Experiments were conducted using the L9 Taguchi design considering an orthogonal array consist of 3 factors and 3 levels. The rotational speed, transverse speed and angle of tilt of the tool are selected as welding parameters. Analysis of variance (ANOVA) is used to analyze the influence of the welding parameters on the responses namely, ultimate tensile strength (UTS) and hardness. The analysis results revealed that the transverse speed is the predominant parameter affecting tensile strength, hardness and quality of the weld. Confirmation test results showed that the Taguchi method coupled with grey relational analysis is very successful in the optimization of welding parameters for maximum strength and hardness in the FSW of AZ91B Magnesium alloy.

On the Study of a TiB2 Nanoparticle Reinforced 7075Al Composite with High Tensile Strength and Unprecedented Ductility

2018 ◽  
Vol 941 ◽  
pp. 1933-1938
Author(s):  
Yu Ma ◽  
Gang Ji ◽  
Zhe Chen ◽  
Ahmed Addad ◽  
Vincent Ji
Keyword(s):  
Tensile Strength ◽  
Hot Extrusion ◽  
Total Elongation ◽  
Industrial Applications ◽  
Processing Route ◽  
High Tensile Strength ◽  
Friction Stir ◽  
Average Grain Size ◽  
Elongation To Failure ◽  
Strength And Ductility

Strength and ductility are the two most important mechanical properties of a structural material. However, they are often mutually exclusive. In this study, a 6 wt. % TiB2 nanoparticle reinforced 7075Al (i.e. TiB2/7075Al) composite was designed and produced by the processing route combining casting, friction stir processing, hot extrusion and T6 heat treatment. The result of tensile testing demonstrates that the as-processed composite sample presents an ultimate tensile strength of 677 MPa and a total elongation to failure of around 15 %, being higher than any Al or Al based materials ever reported. The typical microstructure contains the TiB2 reinforcement nanoparticles uniformly distributed in the equiaxed Al grain matrix (2 μm in average grain size). In addition to the dispersed nanoprecipitates of the 7075Al (Al-Zn-Mg-Cu) matrix, the integrated TiB2 nanoparticles are systematically decorated by a shell corresponding to (Zn1.5Cu0.5)Mg. This finding challenges our understanding and opens a door for further enhancing strength and ductility being easily scalable for industrial applications.

scholarly journals Correlating Tensile Strength & Peak Temperatures for Magnesium Alloy AZ91 during Friction Stir Welding Using Varied Tool Geometries & FEA Tool

10.29007/6xnv ◽  
2018 ◽  
Author(s):  
Kamlesh Dhansukhlal Bhatt ◽  
Nikul Patel ◽  
Vishal Mehta
Keyword(s):  
Tensile Strength ◽  
Friction Stir Welding ◽  
Magnesium Alloy ◽  
Rotation Speed ◽  
Welding Process ◽  
Friction Stir ◽  
Tool Rotation Speed ◽  
Alloy Az91 ◽  
Magnesium Alloy Az91 ◽  
Tool Rotation

Magnesium &amp; its alloys are flammable for conventional fusion welding process. This adverse effect can be eliminated by a non-fusion solid state welding process, established by The Welding Institute (TWI) in 1991, called friction stir welding (FSW). This is applied in this investigation for joining two plates together by using non-consumable tools (three pin profiles) between two abutting plates of magnesium alloy AZ91 having 6 mm thickness. FSW process joins the plates with certain advantages such as low distortion, no shielding gas required, fine recrystallized microstructure, no fumes liberated during the process, etc. In Friction stir welding, process parameters such as welding speed, tool rotation speed, tool dimensions and axial force play an important role during the process. In the present work, the 6 mm thick plates of the said alloy are welded at traverse speed of 28 mm/min to 56 mm/min with tool rotation speed ranging from 710 rpm to 1400 rpm. Tensile strength testing &amp; simulation of peak temperatures has been carried out for establishing correlationship between best parameters from the selected ones with temperature profiles obtained by those parameters for giving optimum structure-property relationship using different pin profiles.

Mechanical and microstructural characterization of Ti-SiC reinforced AA5083 surface composites fabricated via friction stir process

2021 ◽  
Author(s):  
Md. Ziyaur Rahman ◽  
Zahid Akhtar Khan ◽  
Arshad Noor Siddiquee ◽  
Mustufa Haider Abidi ◽  
Mohamed K Aboudaif ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Surface Properties ◽  
Surface Hardness ◽  
Microstructural Characterization ◽  
High Tensile Strength ◽  
Hot Strength ◽  
Friction Stir Process ◽  
Friction Stir ◽  
Surface Composites

Abstract A mixture of Titanium and silicon-carbide powders was embedded in the AA5083 matrix by Friction Stir Processing (FSP). Experiments were performed as per Taguchi L8 orthogonal array, and the effect of reinforcement on hot strength (at 100oC), processed zone (PZ) geometry, and microstructure were investigated. The effect of PZ geometry on the surface properties was also analyzed. The effect of heating the tensile test specimens to 540ºC on the strength at 100oC was also separately investigated. It was observed that surface hardness was significantly enhanced by FSP, and the highest mean hardness of 90.4 HV was observed. Furthermore, it was observed that the surface properties also significantly depend on PZ geometry. From experimental results, it was found that the specimens with the lowest width to depth ratio bears the highest hardness and vice versa. A clear effect of parameters was evident on the geometry of processed zones with a deep bowl, and shallow cup-shaped zones were formed with smaller and larger shoulder diameters, respectively. The samples were processed at 355 rpm, 63 mm/min, 17 mm shoulder, and 355 rpm, 80 mm/min. The 20 mm shoulder showed high tensile strength 292 MPa and 294 Mpa, respectively. The strength of these samples did not reduce much even after heating to 540oC.

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