Towards finding a novel constant between local and bulk strength of friction stir processed aluminum alloys

2021 ◽  
pp. 146442072110250
Author(s):  
MVNV Satyanarayana ◽  
Adepu Kumar ◽  
K Kranthi Kumar
Keyword(s):  
Aluminum Alloys ◽  
Grain Refinement ◽  
Friction Stir Processing ◽  
Linear Relation ◽  
Alloy System ◽  
Primary Objective ◽  
Experimental Investigations ◽  
Friction Stir ◽  
Surface Composites ◽  
Local Strength

Friction stir processing has gained remarkable success in producing ultrafine-grained structures and surface composites. In this context, the primary objective is to establish a linear relationship between local strength (i.e. hardness) and bulk mechanical strength (i.e. tensile strength) of friction stir processed aluminum alloys using experimental investigations on selected alloy system together with data reported in literature sources. Initially, authors generated a linear relation between hardness and strength of friction stir processed aluminum alloys under different cooling conditions. After friction stir processing, recrystallized fine grains were formed and better refinement was achieved in cooling-assisted friction stir processing. Irrespective of grain refinement, the strength and hardness of friction stir processed samples were found to be lower compared to the base metal due to the precipitation phenomenon during friction stir processing. At the same time, hardness and strength improved in cooling-assisted friction stir processing compared to natural-cooled friction stir processing due to better grain refinement going by the parameters of Hall–Petch equation. For friction stir processed samples, relevant constants were found using Hall–Petch equation. The experimental values of hardness and strength were well fitted with the formulated equations due to the formation of a homogeneous fine-grained structure. Also, two novel linear relations were successfully established between hardness and strength with proportionality constants of 1.9 and 2.7, respectively. On the other hand, it was also concluded that it is not possible to establish a linear relation between hardness and strength of surface composites due to structural inhomogeneity and agglomeration of reinforcement particles.

scholarly journals The Grain refinement of Aluminum alloys in Friction Stir Processing: A Review

2018 ◽  
Vol 3 (2) ◽  
pp. 25-37
Author(s):  
N Yuvaraj ◽  
Keyword(s):  
Aluminum Alloys ◽  
Grain Refinement ◽  
Surface Properties ◽  
Friction Stir Processing ◽  
Industrial Applications ◽  
Review Article ◽  
Current Status ◽  
Wear Properties ◽  
Friction Stir ◽  
Refinement Mechanism

Most of the industrial applications based upon surface properties. Aluminum and its alloys are mostly used in the surface application industries due to their excellent mechanical and corrosive properties. However, it exhibits poor tribological properties. To enhance the mechanical and wear properties of the material grain refinement mechanism is to be incorporated. To improve the surface properties of the material the Friction stir Processing (FSP) Technique is mostly used nowadays. FSP plays an important role in modifying the surface in an efficient, environmentally friendly, and economical manner. This review article describes the current status of the FSP Technology in grain refinement of Aluminum alloys.

Fabrication of Hybrid Surface Composites AA6061/(B4C + MoS2) via Friction Stir Processing

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Daulat Kumar Sharma ◽  
Vivek Patel ◽  
Vishvesh Badheka ◽  
Krunal Mehta ◽  
Gautam Upadhyay
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloys ◽  
Friction Stir Processing ◽  
Solid Lubricant ◽  
Hybrid Composites ◽  
Aluminum Matrix ◽  
Friction Stir ◽  
Surface Composite ◽  
Surface Composites ◽  
Structural Applications

Poor tribological properties restrict structural applications of aluminum alloys and surface composites of aluminum alloys have gained more attention in material processing. The addition of solid lubricant reinforcement particles along with abrasive ceramics contributes to the enhancement of tribological performance of surface composites. In the present study, the solid-state technique, friction stir processing (FSP) was used to develop mono (B4C) and hybrid (B4C + MoS2) surface composites in the AA6061-T651 aluminum alloy. The hybrid surface composites were produced by varying an amount of MoS2. Multipass FSP with different direction strategies was adopted for achieving uniform distribution of reinforcement powders in the aluminum matrix. Microstructure analysis showed a uniform dispersal of reinforcement particles without any clustering or agglomeration in the processing zone. Microhardness and wear performance of mono and hybrid composites improved in comparison with the base metal. The mono surface composite exhibited the highest hardness while the hybrid surface composite (75%B4C + 25%MoS2) achieved the highest wear resistance. This was attributed to the solid lubricant nature of MoS2. Furthermore, dissolution of the strengthening precipitate condition during multipass FSP without reinforcement particles resulted in the reduction of hardness and wear resistance.

scholarly journals The Role of Friction Stir Processing (FSP) Parameters on TiC Reinforced Surface Al7075-T651 Aluminum Alloy

2016 ◽  
Vol 21 (4) ◽  
pp. 508-516 ◽  
Author(s):  
Felipe García-Vázquez ◽  
Benjamín Vargas-Arista ◽  
Rodrigo Muñiz ◽  
Juan Carlos Ortiz ◽  
Héctor Hernández García ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Friction Stir Processing ◽  
Weight Ratio ◽  
Nano Particles ◽  
Friction Stir ◽  
Surface Composite ◽  
Surface Composites ◽  
Structural Applications ◽  
Composite Distribution

Abstract: Aluminum alloys are very promising for structural applications in aerospace, military and transportation industries due to their light weight, high strength-to-weight ratio and excellent resistance to corrosion. In comparison to unreinforced aluminum alloys, aluminum/aluminum alloy matrix composites reinforced with ceramic phases exhibit higher strength and hardness, improved tribological characteristics. A novel surface modifying technique, friction stir processing (FSP), has been developed for fabrication of surface composite with an improved performance. The effect of FSP parameters such as number of passes, direction of each pass, sealed or unsealed groove on microstructure was investigated. In this work, nano-particles of TiC (2% in weight) were added to aluminum alloy AA7075-T651 to produce a functional surface. Fixed parameters for this AA7075 alloy were used; rotation speed of 1000 rpm, travel speed of 300 mm/min and pin penetration of 2.8 mm. Optical microscopy (OM), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were employed to study the microstructure of the fabricated surface composites. The results indicated that the selected FSP parameters influenced the area of surface composite, distribution of TiC particles and micro-hardness of the surface composites. Finally, in order to evaluate rate wear the pin on disk test was carried out.

Possibilities to Apply Friction Stir Processing FSP in Surface Engineering

2021 ◽  
Vol 890 ◽  
pp. 56-65
Author(s):  
Cristian Ciucă ◽  
Lia Nicoleta Boțilă ◽  
Radu Cojocaru ◽  
Ion Aurel Perianu
Keyword(s):  
Aluminum Alloys ◽  
Friction Stir Processing ◽  
Surface Engineering ◽  
Copper Alloys ◽  
Welding Process ◽  
Industrial Applications ◽  
Process Conditions ◽  
Cast Aluminum ◽  
Friction Stir ◽  
Cast Aluminum Alloys

The results obtained by ISIM Timisoara to the development of the friction stir welding process (FSW) have supported the extension of the researches on some derived processes, including friction stir processing (FSP). The experimental programs (the researches) were developed within complex research projects, aspects regarding the principle of the process, modalities and techniques of application, experiments for specific applications, being approached. The paper presents good results obtained by friction stir processing of cast aluminum alloys and copper alloys. The optimal process conditions, optimal characteristics of the processing tools were defined. The complex characterization of the processed areas was done, the advantages of the process applying being presented, especially for the cast aluminum alloys: EN AW 4047, EN AW 5083 and EN AW 7021. The characteristics of the processed areas are compared with those of the base materials. The results obtained are a solid basis for substantiating of some specific industrial applications, especially in the automotive, aeronautical / aerospace fields.

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