Sergey Malopheyev
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Special aspects of microstructure formation in Cu–Cr–Zr–Y bronze under low-temperature friction stir processing Open
The use of friction stir treatment (FST) to modify the physical and mechanical properties of age-hardenable low-alloyed bronzes is a promising and at the same time complex task due to the wide temperature range of its implementation. The d…
View article: Investigation on Friction Stir Welding Parameters: Mechanical Properties, Correlations and Corrosion Behaviors of Aluminum/Titanium Dissimilar Welds
Investigation on Friction Stir Welding Parameters: Mechanical Properties, Correlations and Corrosion Behaviors of Aluminum/Titanium Dissimilar Welds Open
In industrial applications, welding of dissimilar metals such as aluminum (Al) and titanium (Ti) is a prerequisite for the development of hybrid components with improved mechanical and corrosion properties. However, dissimilar welding of t…
View article: Effect of Friction Stir Welding and Tempering on the Microstructure and Strength of a Tempformed Low-Alloy Steel
Effect of Friction Stir Welding and Tempering on the Microstructure and Strength of a Tempformed Low-Alloy Steel Open
The microstructure developed in a low-alloy steel during friction stir welding and post-weld tempering was studied. The quenched steel samples were subjected to tempering at 650 °C for 1 h, followed by warm rolling to a total strain of 1.5…
View article: Interfacial Microstructure Produced during Dissimilar AA6013/Ti-6Al-4V Friction Stir Lap Welding under Zero-Penetration Condition
Interfacial Microstructure Produced during Dissimilar AA6013/Ti-6Al-4V Friction Stir Lap Welding under Zero-Penetration Condition Open
The purpose of this study was to investigate the interfacial microstructure that was produced during dissimilar friction stir lap welding (FSW) of 6013 aluminum alloy and Ti-6Al-4V. FSW was conducted under a zero-penetration condition, i.e…
View article: Grain Structure Evolution in 6013 Aluminum Alloy during High Heat-Input Friction-Stir Welding
Grain Structure Evolution in 6013 Aluminum Alloy during High Heat-Input Friction-Stir Welding Open
This work was undertaken to evaluate the influence of friction-stir welding (FSW) under a high-heat input condition on microstructural evolution. Given the extreme combination of deformation conditions associated with such an FSW regime (i…
View article: Microstructural Evolution and Material Flow during Friction Stir Welding of 6013 Aluminum Alloy Studied by the Stop-Action Technique
Microstructural Evolution and Material Flow during Friction Stir Welding of 6013 Aluminum Alloy Studied by the Stop-Action Technique Open
This work is part of a wide-ranging study aiming to enhance the technology of dissimilar friction-stir welding of aluminum and titanium. In the previous study, a new approach was proposed that provided an exceptionally narrow intermetallic…
View article: The Evolution of Abnormal Grains during the Heating Stage of a Post-Weld Solution Treatment in a Friction-Stir-Welded 2519 Aluminium Alloy
The Evolution of Abnormal Grains during the Heating Stage of a Post-Weld Solution Treatment in a Friction-Stir-Welded 2519 Aluminium Alloy Open
This work presents an in-depth investigation of the early stages of abnormal grain growth (AGG) in a friction-stir-welded (FSWed) 2519-T820 aluminium alloy. Microstructural evolutions, which occurred during the heating stage of a solution …
View article: Microstructural Aspects of the Fabrication of Al/Al2O3 Composite by Friction Stir Processing
Microstructural Aspects of the Fabrication of Al/Al2O3 Composite by Friction Stir Processing Open
The purpose of this work was the examination of microstructural evolution during the fabrication of an Al/Al2O3 composite by friction stir processing (FSP). In order to obtain new insight into this process, a longitudinal section of the pr…
View article: Dissimilar Friction Stir Welding of AA2519 and AA5182
Dissimilar Friction Stir Welding of AA2519 and AA5182 Open
In this study, the friction-stir welding (FSW) technique was successfully applied for joining of AA2519 to AA5181 alloy. Microstructure and mechanical properties of dissimilar FSW joints were investigated by optical microscopy, microhardne…
Tailoring of Dissimilar Friction Stir Lap Welding of Aluminum and Titanium Open
An approach was proposed to optimize dissimilar friction stir lap welding of aluminum and titanium alloys. The basic concept of the new technique included (i) the plunging of the welding tool solely into the aluminum part (i.e., no direct …
Numerical Simulation of the Thermo-Mechanical Behavior of 6061 Aluminum Alloy during Friction-Stir Welding Open
In this work, a finite-element model was elaborated to simulate the thermomechanical behavior of 6061 aluminum alloy during friction-stir welding (FSW). It was shown that FSW-induced deformation is a two-stage process. In addition to the s…
On the Heterogeneous Distribution of Secondary Precipitates in Friction-Stir-Welded 2519 Aluminium Alloy Open
The macro-scale distribution of secondary precipitates in friction-stir-welded 2519 aluminium alloy was studied. It was found that precipitation pattern essentially varied within the stir zone in terms of volume fraction, size, and even pr…
Superplastic behavior of friction-stir welded Al–Mg–Sc–Zr alloy in ultrafine-grained condition Open
The present work was undertaken to improve superplastic ductility of friction-stir welded joints of ultrafine-grained (UFG) Al-Mg-Sc-Zr alloy. In order to suppress the undesirable abnormal grain growth, which typically occurs in the heavil…
THE INFLUENCE OF FRICTION STIR WELDING CONDITIONS ON THERMAL STABILITY OF АА6061 ALLOY Open
Friction stir welding (FSW) is an innovative technology for the solid-phase joining of metal materials. It allows producing permanent joints of materials conventionally considered to be nonweldable, in particular aluminum alloys. However, …
Nanoscale structural evolution of Al2Cu precipitates in friction-stir welded Al–Cu–Mg alloy Open
The work is devoted to FSW of cold rolled AA2519. The non-uniform distribution of all second phase precipitates (including coherent θ″ and non-coherent θ) was shown via the TEM-technique. The nucleation of the stable θ-phase, along with de…
Grain structure evolution during friction-stir welding of 6061-T6 aluminum alloy Open
In this work, electron backscattered diffraction (EBSD) was used to examine the evolution of the grain structure during friction stir welding of aluminum alloy 6061-T6. In the entire FSW range studied, the microstructure evolution was foun…
Investigation of an early stage of the abnormal grain growth in the friction-stir welded 6061-T6 aluminum alloy Open
In this work, quasi in-situ electron backscatter diffraction (EBSD) was applied to study an early stage of the abnormal grain growth occurring in the friction-stir welded 6061 aluminium alloy during post-weld solution heat treatment. It wa…
On the local variation of mechanical properties in friction-stir welded 6061 aluminum alloy Open
In this work, digital image correlation technique was applied to investigate local variations of mechanical properties in friction-stir welded 6061 aluminium alloy. A pronounced strain concentration in the bottom section of stir zone was r…
On the Fatigue Performance of Friction-Stir Welded Aluminum Alloys Open
This work was undertaken in an attempt to ascertain the generic characteristics of fatigue behavior of friction-stir welded aluminum alloys. To this end, different alloy grades belonging to both the heat-treatable and non-heat-treatable ty…
Optimization of Friction-Stir Welding of 6061-T6 Aluminum Alloy Open
In this work, two simple but effective strategies were proposed to optimize friction-stir welding of 6061-T6 aluminum alloy. The first one involved an optimization of welding variables to provide a combination of a relatively high welding …
Effect of friction-stir welding on the microstructure and mechanical properties of an Al-Mg-Si alloy Open
In this work, sheets of an Al-Mg-Si alloy were joined by double-side friction stir welding and tempered by standard post-weld artificial aging. The combination of relatively high FSW tool rotation and welding speed with subsequent post-wel…
Friction-stir welding of Al-Mg-Mn-Zr sheets by using a hemispherical tool Open
A new design of the welding tool for friction-stir welding (FSW) was proposed. The main idea was in using of a hemispherical tool probe. Such a tool is very simple (and cost-effective) in fabrication and provides excellent mixing of the ma…