Producing Al5083-CNT composites by friction stir processing: influence of grain refinement and CNT on mechanical and corrosion properties

Magnesium (Mg) and its alloys have attached more and more attention because of their potential as a new type of biodegradable metal materials. In this work, AZ31/ZrO2 nanocomposites with good uniformity were prepared successfully by friction stir processing (FSP). The scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to characterize the microstructure of the composites. The mechanical properties, electrochemical corrosion properties and biological properties were evaluated. In addition, the effect of reinforced particles (ZrO2) on the microstructure and properties of the composite was studied comparing with FSP AZ31 Mg alloy. The results show that compared with the base metal (BM), the AZ31/ZrO2 composite material achieves homogenization, densification, and grain refinement after FSP. The combination of dynamic recrystallization and ZrO2 particles leads to grain refinement of Mg alloy, and the average grain size of AZ31/ZrO2 composites is 3.2 μm. After FSP, the c-axis of grain is deflected under the compression stress of shoulder and the shear stress of pin. The ultimate tensile strength (UTS) and yield strength (YS) of BM were 283 and 137 MPa, respectively, the UTS and YS of AZ31/ZrO2 composites were 427 and 217 MPa, respectively. The grain refinement and Orowan strengthening are the major strengthening mechanisms. Moreover, the corrosion resistance in simulated body fluid of Mg alloy is improved by grain refinement and the barrier effect of ZrO2.

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Improvement of Mechanical and Corrosion Properties of Al/SiC Functionally Graded Material Using a Novel Hybrid Tool in Friction Stir Processing

Silicon ◽

10.1007/s12633-021-01380-1 ◽

2021 ◽

Author(s):

Venkatesh Bikkina ◽

Sadasiva Rao Talasila ◽

Kumar Adepu

Keyword(s):

Functionally Graded Material ◽

Friction Stir Processing ◽

Functionally Graded ◽

Corrosion Properties ◽

Friction Stir ◽

Graded Material ◽

Mechanical And Corrosion Properties

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Mechanical and Corrosion Behavior of Friction Stir Welded AA 6063 Alloy

10.4018/978-1-7998-7864-3.ch010 ◽

2022 ◽

pp. 206-214

Author(s):

Radha R. ◽

Sreekanth D. ◽

Tushar Bohra ◽

Surya Bhan Pratap Singh

Keyword(s):

Friction Stir Welding ◽

High Strength ◽

Metallic Alloys ◽

Fusion Welding ◽

Corrosion Properties ◽

Microstructural Refinement ◽

Significant Development ◽

Friction Stir ◽

Mechanical And Corrosion Properties ◽

Fsw Parameters

Friction stir welding (FSW) is considered to be the most significant development in solid state metal joining processes. This joining technique is energy efficient, environmentally friendly, and versatile. In particular, it can be used to join high-strength aerospace aluminum alloys and other metallic alloys that are hard to weld by conventional fusion welding. The project aims to join Aluminum 6063 alloy plates by FSW and emphasize the (1) mechanisms responsible for the formation of welds without any defects, microstructural refinement, and (2) effects of FSW parameters on resultant microstructure, mechanical, and corrosion properties.

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Influence of Process Parameters on Microstructure of Friction Stir Processed Mg AZ31 Alloy

Materials Science and Engineering ◽

10.4018/978-1-5225-1798-6.ch051 ◽

2017 ◽

pp. 1293-1305

Author(s):

G. Venkateswarlu ◽

M.J. Davidson ◽

G.R.N. Tagore ◽

P. Sammaiah

Keyword(s):

Plastic Deformation ◽

Grain Refinement ◽

Process Parameters ◽

Tilt Angle ◽

Friction Stir Processing ◽

Rotational Speed ◽

Traverse Speed ◽

Homogeneous Microstructure ◽

Friction Stir ◽

Tool Tilt Angle

Friction stir processing (FSP) has been developed on the principles of friction stir welding (FSW) as an effective and efficien new method for grain refinement and microstructural modification, providing intense plastic deformation as well as higher strain rates than other conventional severe plastic deformation methods. FSP produces an equiaxed homogeneous microstructure consisting of fine grains, resulting in the enhancement of the properties of the material at room temperature. The objective of the present paper is to examine the influence of friction stir processing (FSP) parameters namely tool rotational speed (RS), tool traverse speed (TS) and tool tilt angle (TA) on the microstructures of friction stir processed AZ31B-O magnesium alloy. This investigation has focused on the microstructural changes occurred in the dynamically recrystallised nugget zone/ stir zone and the thermo mechanically affected zone during FSP. The results presented in this work indicate that all the three FSP process parameters have a significant effect on the resulting microstructure and also found that the rotational speed has greatly influenced the homogenization of the material. The grain refinement is higher at intermediate rotational speed (1150 rpm), traverse speed (32 mm / min and tilt angle (10). It is established that FSP can be a good grain refinement method for improving the properties of the material.

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Recent Development in Friction Stir Processing as a Solid-State Grain Refinement Technique: Microstructural Evolution and Property Enhancement

Critical Reviews in Solid State and Material Sciences ◽

10.1080/10408436.2018.1490251 ◽

2019 ◽

Vol 44 (5) ◽

pp. 378-426 ◽

Cited By ~ 29

Author(s):

Vivek Patel ◽

Wenya Li ◽

Achilles Vairis ◽

Vishvesh Badheka

Keyword(s):

Solid State ◽

Grain Refinement ◽

Microstructural Evolution ◽

Friction Stir Processing ◽

Friction Stir

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Effect of Friction Stir Processing on Microstructural, Mechanical, and Corrosion Properties of Al-Si12 Additive Manufactured Components

Metals ◽

10.3390/met10010085 ◽

2020 ◽

Vol 10 (1) ◽

pp. 85 ◽

Cited By ~ 3

Author(s):

Ghazal Moeini ◽

Seyed Vahid Sajadifar ◽

Tom Engler ◽

Ben Heider ◽

Thomas Niendorf ◽

...

Keyword(s):

Surface Roughness ◽

Surface Quality ◽

Corrosion Behavior ◽

Friction Stir Processing ◽

Micro Hardness ◽

Corrosion Properties ◽

Microstructural Investigation ◽

Friction Stir ◽

Size Refinement ◽

Hardness Values

Additive manufacturing (AM) is an advanced manufacturing process that provides the opportunity to build geometrically complex and highly individualized lightweight structures. Despite its many advantages, additively manufactured components suffer from poor surface quality. To locally improve the surface quality and homogenize the microstructure, friction stir processing (FSP) technique was applied on Al-Si12 components produced by selective laser melting (SLM) using two different working media. The effect of FSP on the microstructural evolution, mechanical properties, and corrosion resistance of SLM samples was investigated. Microstructural investigation showed a considerable grain refinement in the friction stirred area, which is due to the severe plastic deformation and dynamic recrystallization of the material in the stir zone. Micro-hardness measurements revealed that the micro-hardness values of samples treated using FSP are much lower compared to SLM components in the as-built condition. This reduction of hardness values in samples treated with FSP can be explained by the dissolution of the very fine Si-phase network, being characteristic for SLM samples, during FSP. Surface topography also demonstrated that the FSP results in the reduction of surface roughness and increases the homogeneity of the SLM microstructure. Decreased surface roughness and grain size refinement in combination with the dissolved Si-phase network of the FSP treated material result in considerable changes in corrosion behavior. This work addresses the corrosion properties of surface treated additive manufactured Al-Si12 by establishing adequate microstructure-property relationships. The corrosion behavior of SLM-manufactured Al-Si12 alloys is shown to be improved by FSP-modification of the surfaces.

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