Through-thickness microstructure and mechanical properties in stationary shoulder friction stir processed AA7075

Patel, Vivek; Li, Wenya; Liu, Xichang; Wen, Quan; Su, Yu

doi:10.1080/02670836.2019.1641459

Cited by 41 publications

(31 citation statements)

References 28 publications

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“…Due to no rotation, the stationary shoulder slides over the surface of the S-FSW joint, which is beneficial for scraping the arc corrugations. And meanwhile, the stationary shoulder prevents the plastic materials escaping from the NZ, restraining the formation of flashes [15]. As a result, the surface roughness of the S-FSW joint significantly decreases in comparison to that of the C-FSW joint.…”

Section: The Macrostructures Of Fsw Jointsmentioning

confidence: 99%

A Comparative Investigation on Conventional and Stationary Shoulder Friction Stir Welding of Al-7075 Butt-Lap Structure

Chen

Wang

et al. 2019

Metals

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Both conventional friction stir welding (C-FSW) and stationary shoulder friction stir welding (S-FSW) were employed to join the Al-7075 butt-lap structure, then the microstructural evolution and mechanical characterization of all FSW joints were systematically studied. The C-FSW joint exhibited a rough surface with flashes and arc corrugations, while the surface of the S-FSW joint became smooth. Moreover, for the S-FSW joint, the shoulder-affected zone got eliminated and the material flow mode during FSW was changed owning to the application of stationary shoulder. Furthermore, in comparison to C-FSW, the lower welding heat input of S-FSW decreased the average grain size in the nugget zone and inhibited the coarsening of strengthening precipitates in the heat-affected zone, elevating the overall hardness for the S-FSW joint. In addition, the tensile strength of the S-FSW joint became higher compared to the C-FSW joint, and all the FSW joints failed inside the nugget zone attributing to the existence of hook defect. The sharp-angled hook defect deteriorated the plasticity of the C-FSW joint further, which was only 70% that of the S-FSW joint.

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Section: The Macrostructures Of Fsw Jointsmentioning

confidence: 99%

A Comparative Investigation on Conventional and Stationary Shoulder Friction Stir Welding of Al-7075 Butt-Lap Structure

Chen

Wang

et al. 2019

Metals

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“…Friction stir processing is a unique variant of friction stir welding process, which has the same process principle of the friction stir welding [13,14]. During friction stir processing a rotating tool with a specifically designed pin and shoulder is injected and forwarded into a base material and results in a severe plastically deformed zone; stir zone with the fine equiaxed grained microstructure owing to dynamic recrystallization phenomenon [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Different reinforcement strategies of hybrid surface composite AA6061/(B₄C+MoS₂) produced by friction stir processing

Sharma

Patel

Badheka

et al. 2020

Materialwissenschaft Werkst

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Aluminum surface composites have gained huge importance in material processing due to their noble tribological characteristics. The reinforcement of solid lubricant particles with hard ceramics further enriches the tribological characteristics of surface composites. In the current study, friction stir processing was chosen to synthesize hybrid surface composites of aluminum containing B 4 C and MoS 2 particles with anticipated improved tribological behavior. B 4 C and MoS 2 powder particles in 87.5: 12.5 ratio were reinforced into the AA6061 by hole and groove method. Microstructural observations indicated that reinforcement particles are well distributed in the matrix. The hardness and wear resistance of hybrid surface composites improved as compared to the base material, due to well distributed abrasive B 4 C and solid lubricant MoS 2 particles in AA6061. The hybrid surface composites achieved~32 % increased average hardness as compared to the base material. Hole method revealed~13 % better wear resistance compared to the groove method for friction stir processed hybrid surface composite, attributing to an improved homogeneity of particle distribution shown by zigzag hole pattern. Moreover, friction stir processed AA6061 without reinforcement particles exhibited reduced hardness and wear resistance due to loss of strengthening precipitates during multi-pass friction stir processing.

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“…9. As seen, due to FSPinduced dynamic recrystallization [44] the fine equiaxed (37.2 ± 10.1 µm) grains of Ti-modified base metal (BM) (Fig. 9b) are converted to the ultrafine equiaxed grains with the average size of 5.4 ± 1.6 µm and 2.3 ± 0.9 µm in 3Si-1P (Fig.…”

Section: Methodsmentioning

confidence: 93%

Optimizing the mechanical properties of Al-4.5Cu-xSi alloys through multi-pass friction stir processing and post-process aging

Mostafavi

Taghiabadi

Jafarzadegan

2021

Archiv.Civ.Mech.Eng

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The effect of post-process aging on the microstructure and mechanical properties of multi-pass friction stir processed (FSPed) Al-4.5Cu alloy containing Si (1, 3, and 5 wt.%) was studied. According to the results, adding Si improved the fluidity and decreased the porosity content of the alloy. The addition of Si up to 3 wt.% also enhanced the mechanical properties. However, further addition of Si up to 5 wt.% impaired the tensile properties. Applying the first pass of FSP improved the tensile strength and fracture strain of the alloy containing 3 wt.% Si by 25 and 125%, respectively. However, the second and fourth pass of FSP substantially improved the fracture strain, but deteriorated the hardness and tensile strength of the alloy containing 3 wt.% Si. Post-FSP aging at 180 °C for 8 h significantly improved the mechanical properties. For instance, compared to the as-cast condition, the hardness, tensile strength, fracture strain, and toughness of post-aged four-pass FSPed Al-4.5Cu-3Si alloy increased by 107, 108, 175, and 310%, respectively. According to the fractography results, the fracture surface morphology of Al-4.5Cu-3Si alloy changed from a quasi-cleavage mode in as-cast condition to a ductile-dimple fracture mode after post-FSP aging.

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Through-thickness microstructure and mechanical properties in stationary shoulder friction stir processed AA7075

Cited by 41 publications

References 28 publications

A Comparative Investigation on Conventional and Stationary Shoulder Friction Stir Welding of Al-7075 Butt-Lap Structure

A Comparative Investigation on Conventional and Stationary Shoulder Friction Stir Welding of Al-7075 Butt-Lap Structure

Different reinforcement strategies of hybrid surface composite AA6061/(B₄C+MoS₂) produced by friction stir processing

Optimizing the mechanical properties of Al-4.5Cu-xSi alloys through multi-pass friction stir processing and post-process aging

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Through-thickness microstructure and mechanical properties in stationary shoulder friction stir processed AA7075

Cited by 41 publications

References 28 publications

A Comparative Investigation on Conventional and Stationary Shoulder Friction Stir Welding of Al-7075 Butt-Lap Structure

A Comparative Investigation on Conventional and Stationary Shoulder Friction Stir Welding of Al-7075 Butt-Lap Structure

Different reinforcement strategies of hybrid surface composite AA6061/(B4C+MoS2) produced by friction stir processing

Optimizing the mechanical properties of Al-4.5Cu-xSi alloys through multi-pass friction stir processing and post-process aging

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About

Different reinforcement strategies of hybrid surface composite AA6061/(B₄C+MoS₂) produced by friction stir processing