Microstructural, Thermal and Corrosion Characterization of Friction Stir Welded Magnesium Alloys

The requirement for structural materials with demanding properties is always a major concern among automotive researchers. Magnesium alloys possess the required properties. In this work magnesium alloys, AZ31B and AZ91B were joined by friction stir welding. The influence of process parameters on the weld properties has been studied. The process parameters were tool rotational speed, welding speed, tilt angle. Three different combinations AZ31B-AZ91B, AZ31B-AZ31B and AZ91B-AZ91B were friction stir welded. Non-destructive tests have been performed on the welded joints as the primary analysis. After mechanical testing, optical microscopic examination comprising of macrostructure analysis, microstructure analysis and SEM analysis were carried out on selected specimens and the results are formulated. The corrosion behavior of Mg alloys has been tested using a salt spray test. The thermal behavior was studied using thermogravimetric and differential thermal analysis. The joints were friction stir welded with maximum efficiency where grain refinement was observed in the weld microstructure of dissimilar alloys and the elongated grains was recrystallized. This paper primarily focuses on the microstructural aspects, corrosion performances and TG/DTA analysis.

Download Full-text

Influence of Process Parameters on the Product Integrity in Friction Stir Extrusion of Magnesium Alloys

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.716.39 ◽

2016 ◽

Vol 716 ◽

pp. 39-48 ◽

Cited By ~ 1

Author(s):

Dario Baffari ◽

Gianluca Buffa ◽

Livan Fratini

Keyword(s):

Numerical Model ◽

Magnesium Alloys ◽

Process Parameters ◽

Material Flow ◽

Previous Treatment ◽

Influence Of Process Parameters ◽

Friction Stir ◽

Recycling Technology ◽

Metal Machining ◽

Friction Stir Extrusion

Friction Stir Extrusion is an innovative direct-recycling technology for metal machining chips. During the process a specifically designed rotating tool is plunged into a cylindrical matrix containing the scraps to be recycled. The stirring action of the tool prompts solid bonding related phenomena allowing the back extrusion of a full dense rod. This process results to be particularly relevant because allows the reuse of the scrap without any previous treatment. Experiments have been carried out in order to investigate the influence of the process parameters on the extrudes quality and a numerical model has been developed in order to simulate the evolution of the material flow.

Download Full-text

The influence of process parameters on mechanical properties and corrosion behaviour of friction stir welded aluminum joints

Procedia Engineering ◽

10.1016/j.proeng.2017.10.1026 ◽

2017 ◽

Vol 207 ◽

pp. 591-596 ◽

Cited By ~ 7

Author(s):

Gianluca D’Urso ◽

Claudio Giardini ◽

Sergio Lorenzi ◽

Marina Cabrini ◽

Tommaso Pastore

Keyword(s):

Mechanical Properties ◽

Process Parameters ◽

Corrosion Behaviour ◽

Influence Of Process Parameters ◽

Friction Stir ◽

Mechanical Properties And Corrosion

Download Full-text

Longitudinal Residual Stress Analysis in AA2024-T3 Friction Stir Welding

The Open Mechanical Engineering Journal ◽

10.2174/1874155x01307010018 ◽

2013 ◽

Vol 7 (1) ◽

pp. 18-26 ◽

Cited By ~ 21

Author(s):

Pierpaolo Carlone ◽

Gaetano S. Palazzo

Keyword(s):

Friction Stir Welding ◽

Residual Stresses ◽

Process Parameters ◽

Material Properties ◽

Stress Measurement ◽

Dynamic Performance ◽

Contour Method ◽

Influence Of Process Parameters ◽

Friction Stir ◽

Longitudinal Residual Stress

Friction Stir Welding (FSW) is an innovative solid-state joining process, which is gaining a great deal of attention in several applicative sectors. The opportune definition of process parameters, i.e. minimizing residual stresses, is crucial to improve joint reliability in terms of static and dynamic performance. Longitudinal residual stresses, induced by FSW in AA2024-T3 butt joints, have been inferred by means of a recently developed technique, namely the contour method. Two approaches to stress measurement have been adopted; the former is based on the assumption of uniform material properties, the latter takes into account microstructural effects and material properties variations in the welding zones. The influence of process parameters, namely rotating and welding speeds, on stress distribution is also discussed.

Download Full-text

Microstructural and Mechanical Properties of a Solid-State Additive Manufactured Magnesium Alloy

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4052968 ◽

2021 ◽

pp. 1-21

Author(s):

Thomas Robinson ◽

Malcolm Williams ◽

Harish Rao ◽

Ryan P. Kinser ◽

Paul Allison ◽

...

Keyword(s):

Mechanical Properties ◽

Additive Manufacturing ◽

Solid State ◽

Magnesium Alloy ◽

Magnesium Alloys ◽

Process Parameters ◽

Weight Ratio ◽

Structural Components ◽

Friction Stir ◽

Magnesium Alloy Az31b

Abstract In recent years, additive manufacturing (AM) has gained prominence in rapid prototyping and production of structural components with complex geometries. Magnesium alloys, whose strength-to-weight ratio is superior compared to steel and aluminum alloys, have shown potential in lightweighting applications. However, commercial beam-based AM technologies have limited success with magnesium alloys due to vaporization and hot cracking. Therefore, as an alternative approach, we propose the use of a near net-shape solid-state additive manufacturing process, Additive Friction Stir Deposition (AFSD), to fabricate magnesium alloys in bulk. In this study, a parametric investigation was performed to quantify the effect of process parameters on AFSD build quality including volumetric defects and surface quality in magnesium alloy AZ31B. In order to understand the effect of the AFSD process on structural integrity in the magnesium alloy AZ31B, in-depth microstructure and mechanical property characterization was conducted on a bulk AFSD build fabricated with a set of acceptable process parameters. Results of the microstructure analysis of the as-deposited AFSD build revealed bulk microstructure similar to wrought magnesium alloy AZ31 plate. Additionally, similar hardness measurements were found in AFSD build compared to control wrought specimens. While tensile test results of the as-deposited AFSD build exhibited a 20 percent drop in yield strength, nearly identical ultimate strength was observed compared to the wrought control. The experimental results of this study illustrate the potential of using the AFSD process to additively manufacture Mg alloys for load bearing structural components with achieving wrought-like microstructure and mechanical properties.

Download Full-text

Studies on the influence of process parameters in friction stir spot welded joints – A review

Materials Today Proceedings ◽

10.1016/j.matpr.2020.08.532 ◽

2020 ◽

Author(s):

R. Suryanarayanan ◽

V.G. Sridhar

Keyword(s):

Process Parameters ◽

Welded Joints ◽

Influence Of Process Parameters ◽

Friction Stir ◽

Spot Welded

Download Full-text

Fabrication and characterization of friction stir processed Al 6061 reinforced with TiB2-Al2O3

International Journal of Structural Integrity ◽

10.1108/ijsi-03-2020-0026 ◽

2020 ◽

Vol ahead-of-print (ahead-of-print) ◽

Author(s):

Ch. Mohana Rao ◽

K. Mallikarjuna Rao

Keyword(s):

Mechanical Properties ◽

Aluminum Alloy ◽

Process Parameters ◽

Friction Stir Processing ◽

Practical Implication ◽

Research Work ◽

Influence Of Process Parameters ◽

Volume Percentage ◽

Content Type ◽

Friction Stir

PurposeThe objective of the paper is to evaluate the fabrication process and to study the influence of process parameters of friction stir processing of 6061-TiB2-Al2O3 Aluminum alloy surface composite on microhardness tensile strength, and microstructure.Design/methodology/approachFriction stir processing method is used for attaining the desired mechanical properties, and selectively processed reinforcements to fabricate the samples. The Taguchi technique was used to optimize rotational speed, travel speed and volume percentage of reinforcement particles to enhance the mechanical properties of 6061-TiB2-Al2O3 Aluminum alloy composite.FindingsThe fabrication of surface composites through FSP allows new inventions in terms of material with enhanced surface layers without changing the base metal.Practical implicationsTo examine the behavior of the surface of the composites in the different zones, the practical implication consists of the use of different characterization techniques like optical microscopy and scanning microscopy for microstructural behavior and the measurement of hardness and tensile tests for mechanical behavior.Originality/valueThe research work consists of tool design and process parameters, which can affect the final product (microstructural changes), and the performance of the modified surface layer behavior was studied and presented.

Download Full-text