Friction-stir welding of ultra-fine grained sheets of Al–Mg–Sc–Zr alloy

2015 ◽  
Vol 624 ◽  
pp. 132-139 ◽  
Author(s):  
S. Malopheyev ◽  
S. Mironov ◽  
V. Kulitskiy ◽  
R. Kaibyshev
Keyword(s):  
Friction Stir Welding ◽  
Friction Stir ◽  
Fine Grained ◽  
Zr Alloy

Process Relationship in High-Stress Friction Coupled with Complex Shaped Counterbody and Friction Stir Welding Al-Mg-Sc-Zr Alloy

2022 ◽  
Vol 1049 ◽  
pp. 39-44
Author(s):  
Andrey Chumaevskii ◽  
Denis Gurianov ◽  
Anastasiya Gusarova ◽  
Anna Zykova ◽  
Aleksandr Panfilov ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Complex Shape ◽  
High Stress ◽  
Large Crystal ◽  
Friction Zone ◽  
Friction Stir ◽  
Model Research ◽  
Alloy Material ◽  
Distinguishing Features ◽  
Zr Alloy

Model research tests of plastic deformation, fragmentation and flow of aluminum alloy material of Al-Mg-Sc-Zr system under high loaded friction in pair with a steel counterbody of a complex shape and comparison of the obtained result with the structure formed by friction stir welding have been carried out. The conducted studies show that the structure formed by extrusion of the material from the friction zone and its compaction in the channel of the counterbody is, in general, close in structure to the structure formed by friction stir welding of similar material. The distinguishing features of the structure formed in the model experiments on friction include the introduction into the stirring zone of material with deformed large-crystal structure, increased grain size of the stirring zone, the presence of defects and differences in the geometry of the stirring zone.

Superplastic Behavior and Microstructure of Titanium (Ti-6Al-4V) Friction Stir Welds Made under a Variety of Processing Conditions

2010 ◽  
Vol 433 ◽  
pp. 169-176 ◽  
Author(s):  
Paul Edwards ◽  
Mamidala Ramulu ◽  
Daniel G. Sanders
Keyword(s):  
Friction Stir Welding ◽  
Base Material ◽  
Superplastic Forming ◽  
Spindle Speed ◽  
Processing Conditions ◽  
Superplastic Behavior ◽  
Friction Stir ◽  
Fine Grained ◽  
Weld Parameters

Friction Stir Welding of Ti-6Al-4V was performed on 5 mm thickness plate in order to assess the affect of welding conditions on the resulting microstructure and superplastic forming behavior of the joints. A variety of welding conditions were tested and all welds were subsequently Superplastically formed. It was found that the weld parameters do influence the microstructure and degree of superplastic performance of the joints. Spindle speed was found to have the most dominant affect on the resulting microstructure and superplastic forming behavior. Low spindle speed welds lead to fine grained microstructures and highly superplastic welds, relative to the base material, while high spindle speed welds larger grained microstructures and less superplastic welds.

scholarly journals Friction-stir welding of an Al–Mg–Sc–Zr alloy in as-fabricated and work-hardened conditions

2014 ◽  
Vol 600 ◽  
pp. 159-170 ◽  
Author(s):  
S. Malopheyev ◽  
V. Kulitskiy ◽  
S. Mironov ◽  
D. Zhemchuzhnikova ◽  
R. Kaibyshev
Keyword(s):  
Friction Stir Welding ◽  
Friction Stir ◽  
Zr Alloy

scholarly journals Microstructural Analysis of Friction Stir Butt Welded Al-Mg-Sc-Zr Alloy Heavy Gauge Sheets

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 806 ◽  
Author(s):  
Tatiana Kalashnikova ◽  
Andrey Chumaevskii ◽  
Kirill Kalashnikov ◽  
Sergei Fortuna ◽  
Evgeny Kolubaev ◽  
...  
Keyword(s):  
Base Metal ◽  
Microstructural Analysis ◽  
Metal Flow ◽  
Sheet Thickness ◽  
Stir Zone ◽  
Layer By Layer ◽  
Friction Stir ◽  
Fine Grained ◽  
Grain Size Distributions ◽  
Zr Alloy

Friction stir welding (FSW) on a heavy gauge sheet of a hereditary fine-grained Al-Mg-Sc-Zr alloy was carried out to study the specifics of plasticized metal flow and microstructural evolution in different sections and zones of the joint. It was found that the stir zone (SZ) macrostructure may contain either a single or many nugget zones depending on the metal sheet thickness and the seam length. The effect of grain kinking in a thermomechanically affected zone (TMAZ) under pressure from the stir zone metal was discovered. The stir zone metal was fine-grained but had a microhardness lower than that of the base metal, which may be explained by the overaging effect of FSW on the Al3Sc precipitates. The tensile strength of the joint was almost equal to that of the base metal (BM). The grain size distributions were obtained in different sections below the sheet surface and away from the exit hole, which allowed us to suggest the specific adhesion-assisted layer-by layer metal transfer mechanism in FSW.

Improved Recrystallization Resistance and Welding Properties of Cold-Rolled Al-Mg Alloy Sheets by Microalloying with Sc and Zr

2021 ◽  
Vol 1035 ◽  
pp. 17-24
Author(s):  
Hao Wu ◽  
Zhi Kai Zheng ◽  
Si Meng Ren ◽  
Shu Lei Li ◽  
Hu Wang ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Welded Joints ◽  
Alloy Sheet ◽  
Mg Alloy ◽  
Softening Effect ◽  
Welding Temperature ◽  
Friction Stir ◽  
Alloy Increase ◽  
Welding Properties ◽  
Zr Alloy

The effects of Sc and Zr element on the recrystallization behavior and microstructure evolution of Al-Mg alloy had been researched in this paper, and meanwhile, the microstructure and mechanical properties of the friction stir welding joints were also analyzed. The results show that the recrystallization and grain growth behavior of Al-Mg-Sc-Zr alloy can be inhibited effectively by microalloying with Sc and Zr. Compared with Al-Mg and Al-Mg-Zr alloys, the recrystallization start temperature and finish temperature of Al-Mg-Sc-Zr alloy increase significantly, and the strength of alloy sheet which subjected to stabilizing annealing is increased by more than 50MPa. Moreover, the recrystallization softening effect of the welded joints microstructure, which caused by the welding temperature field and welding heat input, can be weaken by microalloying with Sc and Zr, the width of recrystallization zone is reduced, the microstructure and properties of the welded joints are improved. The friction stir welding coefficients of Al-Mg-Sc-Zr alloy increases to 86.9%.

Microstructure and Residual Stress Formation during Friction-Stir Welding of Semi-Solid Cast ZK60-RE Magnesium Alloy

2014 ◽  
Vol 922 ◽  
pp. 688-693 ◽  
Author(s):  
E.P. Silva ◽  
Larissa Fernandes Batista ◽  
Bruna Callegari ◽  
Victor Ferrinho Pereira ◽  
Ricardo Henrique Buzolin ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Dynamic Recrystallization ◽  
Lap Joints ◽  
Lap Joint ◽  
Friction Stir ◽  
Fine Grained ◽  
Stress Maximum ◽  
Zk60 Alloy ◽  
Stress Formation ◽  
Semi Solid

In this work, we report on the friction stir weldability of a semi-solid cast ZK60 alloy modified with 1.5 wt% mischmetall in the lap-joint configuration using a 120WV4 steel tool with concave shoulder and conical pin. The coarser solidification microstructure in the semi-solid cast ZK60-1.5%RE alloy requires low strain rates and increased heat input to produce lap-joints without inner defects. This was achieved with 250 rpm tool rotation and 50 mm/min welding speed. Friction stir welding results in a very fine grained microstructure in the stir zone probably due to dynamic recrystallization. In the thermomechanically affected zones dynamic recrystallization seems to occur within the solute enriched intergranular zones. The distribution of longitudinal residual stresses exhibit stress maxima at both thermomechanically affected zones. A compression peak is observed at the retreating side, whereas a tensile stress maximum occurs at the advancing side.

Microstructure Features of Aluminum Alloys Welded Joint Obtained by Friction Stir Welding

2013 ◽  
Vol 872 ◽  
pp. 174-179 ◽  
Author(s):  
Olga Sizova ◽  
Galina Shlyakhova ◽  
Alexander Kolubaev ◽  
Evgeny A. Kolubaev ◽  
Sergey Grigorievich Psakhie ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Weld Metal ◽  
Weld Zone ◽  
Second Phase ◽  
Friction Stir ◽  
Fine Grained ◽  
Cu Alloy ◽  
Intermetallic Particles ◽  
Weld Structure ◽  
Fine Grained Structure

The paper presents a metallographic study of aluminum alloy welds produced by friction stir welding. The weld structure is described for two alloys: Al-Cu and Al-Mg. It is shown that friction stir welding provides a fine-grained structure of the weld. The phase composition of the weld metal for the studied alloys is defined. Differences in the structure and distribution of second-phase particles in the weld metal are shown. The weld zone of Al-Cu alloy consists of equal size grains, with intermetallic particles located along the grain boundaries. The weld structure of Al-Mg alloy is banded, with alternating layers consisting of different size grains.

Retention of fine grained microstructure of equal channel angular pressed aluminum alloy 1050 by friction stir welding

2001 ◽  
Vol 45 (1) ◽  
pp. 109-114 ◽  
Author(s):  
Yutaka S Sato ◽  
Mitsunori Urata ◽  
Hiroyuki Kokawa ◽  
Keisuke Ikeda ◽  
Masatoshi Enomoto
Keyword(s):  
Aluminum Alloy ◽  
Friction Stir Welding ◽  
Friction Stir ◽  
Fine Grained
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