Fine grain formation during phase transformation of a thermo-mechanically treated AA8090

Vigraman, T.; Krishna, Murali; Kumar, M.V.S. Pavan

doi:10.1016/j.matpr.2020.06.556

Cited by 5 publications

(9 citation statements)

References 17 publications

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“…A lot of work has been done by various eminent researchers in the area of FSW. Vigraman et al (2021) experimentally investigated the effect of various process parameters on the FSW process by altering their values. Results reported that Vickers hardness values and maximum tensile strength had been observed as 119.4 VHN and 427 MPa, respectively Cisko et al (2019).…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of friction stir welded aviation grade AA8090 joints using Taguchi orthogonal array

Panwar

Chandna

2022

AEAT

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Purpose This paper aims to predict the performance of friction stir welded AA8090 joint. Design/methodology/approach In the present study, Al-Li AA8090 plates are butt joined using friction stir welding (FSW). The experiments are designed and optimized using a Taguchi-orthogonal array. The experiments are conducted at three different process parameters, i.e. tool rotational speed (TRS), tool transverse speed (TTS) and dwell time (DT). The ultimate tensile strength (UTS) and microhardness (MH) are considered as response parameters. In addition, a statistical tool (ANOVA) is used to check the adequacy of experiment results. Findings The maximum UTS of 220 MPa is obtained at a TRS of 1,400 rpm, tool TTS of 40 mm/min and DT of 15 s. The maximum microhardness is obtained for 1,400 rpm, 25 mm/min and 8 s, i.e. 108.6 HV. The microstructural showed that the minimum grain is observed at the nugget zone. Fractography analysis revealed the ductile behaviour of fractured surfaces. Originality/value From the reported literature, it has been observed that very limited work is reported on the FSW of AA8090 alloy. Further, the thermal behaviour of welded joint is also observed in this experimental work.

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Section: Introductionmentioning

confidence: 99%

Experimental analysis of friction stir welded aviation grade AA8090 joints using Taguchi orthogonal array

Panwar

Chandna

2022

AEAT

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“…The parameters were sourced from elsewhere (Ponte, 2007) 2 and stated to be the optimal parameters for this material, although a "kissing bond" defect (see section 2.3.10) was observed on one weld. Vigraman et al (2021) studied FSW of 10 mm thick AA8090 (temper not provided) using a range of rotational speeds (800, 1000 and 1200 rpm) with constant traversing speed (2.5 mm/s). Optical microscopy and SEM revealed the presence of fine grains and intermetallic compounds likely to have been Al2Cu, AlCuLi, β-phase, FeAl2, Mn3Si2Al12…”

Section: Fsw/ Ssfsw Of Aa8090mentioning

confidence: 99%

“…Some of the hardness is regained in the nugget, in part to the Hall-Petch relationship previously described, and may or may not achieve the original parent material value. The literature available regarding FSW of AA8090 indicates that the hardness in the nugget should recover to and even beyond that of the parent material (Lertora & Gambaro, 2010;Pedemonte et al, 2013;Vigraman et al, 2021). Mixed results…”

Section: Hardnessmentioning

confidence: 99%

“…In their FSW AA8090-T8 Lertora and Gambaro (2010) achieved tensile weld efficiencies (tensile strength of weld divided by tensile strength of parent material (x100)) of 56.34-71.53% depending on the weld parameters used and the amount of natural aging which had occurred. Vigraman et al (2021) achieved 88.9% weld efficiency on their FSW AA8090 (no temper stated). The position of failure was reported as within the parent material.…”

Section: Tensile Strength and Ductilitymentioning

confidence: 99%

“…Vigraman, Vijay Krishna and Pavan Kumar (2021) with a value of 4-5 μm, however no details of the material temper or heat treatment were provided. The disparity between the results obtained here and that found in literature is attributed to potential differences in heat treatment as grain size is highly dependent on thermal history, and the results from this research are considered valid.…”

Section: Materials Microstructurementioning

confidence: 99%

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Stationary shoulder friction stir welding of military aircraft sheet alloys

Puckrin¹

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Stationary Shoulder Friction Stir Welding (SSFSW) allows joining of materials without the addition of mass and could be a potential solution to expedient helicopter repair in operational theatre. This research considers the suitability for SSFSW of two aluminium alloys commonly used within the Merlin helicopter airframe, AA8090 and BS L165. Techniques including optical microscopy, hardness, tensile and fatigue testing were used to characterise the two alloys and to establish a baseline for comparison with the welded specimens. The welds were performed in four configurations, with each welded both parallel and perpendicularly to the material’s rolling direction. This was in an effort to establish: the alloy’s suitability for SSFSW in both similar and dissimilar welds; the effect of changing the alloy positioned on the advancing side; and the influence of the material rolling direction on the quality of the weld. Techniques similar to those used in the material characterisation were used to determine the quality of each configuration. Encouraging tensile and fatigue strength results were achieved, especially for the similar materials welds with BS L165 welded parallel to the rolling direction achieving over 100% UTS weld efficiency. Inconsistent quality including the presence of kissing bonds was, however, observed. When welding parallel to the rolling direction, stronger welds were produced with BS L165 positioned on the advancing side. The presence of kissing bonds made analysis of those welded perpendicular to the rolling direction inconclusive. The material rolling direction also had an effect on the weld, as demonstrated through differences in weld appearance, degree of mixing of materials and tensile and fatigue test results. Additionally, a relationship between hardness and tensile strength was determined which revealed close correlation between the governing equation and the test results, with only 7% scatter. This will allow for prediction of tensile strength, based on the measured hardness, when the materials are joined using SSFSW.

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Characterization of composite laminate with copper and AISI304 made by a diffusion bonding process

Vigraman

2021

Materials Today: Proceedings

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Fine grain formation during phase transformation of a thermo-mechanically treated AA8090

Cited by 5 publications

References 17 publications

Experimental analysis of friction stir welded aviation grade AA8090 joints using Taguchi orthogonal array

Experimental analysis of friction stir welded aviation grade AA8090 joints using Taguchi orthogonal array

Stationary shoulder friction stir welding of military aircraft sheet alloys

Characterization of composite laminate with copper and AISI304 made by a diffusion bonding process

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