Influence of magnesium AZ80 friction stir weld texture on tensile strain localisation

Hiscocks, Jessica; Diak, B.J.; Gerlich, A.P.; Daymond, Mark R.

doi:10.1080/02670836.2016.1173394

Cited by 7 publications

(5 citation statements)

References 37 publications

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“…In contrast to previous work [16] that showed more heat input improved the mechanical properties of defect-free similar AZ80 friction stir welds, the current results show that higher heat input is not necessarily better for dissimilar AZ80–AZ31 welds. It is evident that the spatial distribution of AZ80 and AZ31 within the stir zone dominates the deformation behaviour instead of texture or residual strain, resulting in different overall trends.…”

Section: Resultscontrasting

confidence: 99%

“…To verify that optimum processing parameters found in previous work with AZ80 bead on plate welds [16] were applicable to the current tooling and dissimilar materials, joint AZ80–AZ31–S6 was made at 63 mm min −1 and compared to AZ80–AZ31–S7 made at 90 mm min −1 . The tensile performance of both welds was nearly identical at lower strains, with strain localisation occurring at 75 MPa and 79 MPa for the 63 and 90 mm min −1 conditions respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Later, strain localisation at the top of the RS interface becomes apparent, remaining at all times lower than at the AS interface. As stress increases, strain begins to spread towards the nugget centre (see 5a), but is generally low here due to poor orientation for basal slip [16]. Failure will occur by delamination of the AS interface.…”

Section: Discussionmentioning

confidence: 99%

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Strain localisation and failure of dissimilar magnesium-based alloy friction stir welds

Hiscocks

Diak

Gerlich

et al. 2018

Science and Technology of Welding and Joining

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Dissimilar butted combinations of magnesium alloys AZ31, AZ61 and AZ80 were friction stir welded and transverse tensile tested until failure. Strain mapping across the deforming weld nugget and interfaces was carried out to correlate the deformation to the local microstructures. Mechanical performance was found to be highly dependent on the spatial distribution of alloys within the nugget and thus highly sensitive to changes in the tooling geometry. Process control requirements for repeatable, high-quality dissimilar friction stir welds will therefore be far more rigorous and challenging than those of similar welds of these alloys. In addition, proximity to the tool insertion point was found to decrease tensile performance, likely due to changes in tooling temperature.

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Section: Resultscontrasting

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Strain localisation and failure of dissimilar magnesium-based alloy friction stir welds

Hiscocks

Diak

Gerlich

et al. 2018

Science and Technology of Welding and Joining

Self Cite

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“…[ 70 ] In addition to phase formation during solidification, XRD can be used to study phase formation due to certain processing steps and techniques, such as aging of the material [ 70 ] or explosive welding. [ 71 ] By assessing the lattice spacing shift, peak broadening, and changes in intensities, internal stresses and dislocations in the material due to processing, such as equal channel angular pressing (ECAP), [ 72 ] laser beam welding, [ 73 ] or friction stir welding, [ 74 ] can be determined. The stresses can be spatially resolved by adjusting the beam size and position.…”

Section: Alloy Developmentmentioning

confidence: 99%

Utilizing Synchrotron Radiation for the Characterization of Biodegradable Magnesium Alloys—From Alloy Development to the Application as Implant Material

et al. 2021

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Magnesium (Mg)-based alloys are investigated for the use as lightweight structural metals, e.g., in the automotive industry, [1] as biodegradable implant materials [2] and for hydrogen storage. [3] The choice of alloying system and subsequent processing of the material is a crucial factor for the degradation profile of the alloy and its mechanical properties. [4][5][6][7] This review focuses on use of Mg alloys as implant material, with some references to its application as a structural metal.The degradation profile of Mg alloys is of particular importance for their application as implant materials, as a controlled degradation is required to ensure cell viability and implant stability in vivo. [8,9] During the development of Mg alloys for the application as a biodegradable implant, alloying systems are carefully selected and manufactured, with their microstructure being tailored according to specifications by selecting the appropriate processing route. The microstructure and the mechanical properties of the alloy will be evaluated and the alloy is then tested for in vitro degradation in an aqueous environment under physiological conditions (pH %7.4, 37 C, 5% CO 2 , 21% O 2 , 95% rel. humidity) with and without cells to assess its general degradation properties and cell viability. [10] The mechanical properties and degradation profile need to be tailored depending on the application of the implant. Mg alloys for bone support, for example, require mechanical properties close to that of bone. For bone, the average Young's modulus is between 7 and 31 GPa, depending on the type of bone and its hydration state. [11,12] In longitudinal direction, the bone's tensile and compressive ultimate strength have been reported to be between 93 and 135 MPa, and 154 and 205 MPa, respectively. [13,14] Finally, the elongation to failure of the clinically approved MAGNEZIX screw by Syntellix AG (Hanover, Germany) was determined to be 8%. [15] By contrast, Mg alloys designed for the use as stents must possess a minimum ultimate tensile strength of 300 MPa, low yield strength of 200-300 MPa, and higher ductility (min. 15%-18% elongation to failure, preferably 30%) for their successful deployment. [16,17] Finally, in vivo animal experiments are conducted to evaluate the alloy suitability for the translation into the clinic.

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“…As a solid-state welding technology, FSW achieves the joints of good quality by microstructural refinement. [4][5][6] Based on the FSW, friction stir spot welding (FSSW) technique was drawn up and used to weld the overlapped plates. It is operated by plunging a rotating welding tool into the workpiece and then extracting tool after a dwell time.…”

Section: Introductionmentioning

confidence: 99%

Effects of nano-SiC particles on the FSSW welded AZ31 magnesium alloy joints

Shen

et al. 2017

Materials Science and Technology

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The microstructure of nano-SiC enhancing friction stir spot welding (FSSW) joint with dwell time of 3 s was characterised by an onion ring structure which consisted of alternate SiC-free zones and SiC-rich zones where SiC particles refined the grains. However, onion ring structure disappeared and SiC particles dispersed homogeneously when dwell time was 5 s. The microhardness of stir zone (SZ) and tensile shear load of SiC enhancing FSSW joint were higher than those of conventional FSSW joints. After heat treatment at 200°C for an hour, grains of the SZ grew substantially and coursed reduction in mechanical properties of joints, while grain size of SZ and tensile shear load of SiC enhancing joint was invariant but the microhardness of SZ increased.

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Influence of magnesium AZ80 friction stir weld texture on tensile strain localisation

Cited by 7 publications

References 37 publications

Strain localisation and failure of dissimilar magnesium-based alloy friction stir welds

Strain localisation and failure of dissimilar magnesium-based alloy friction stir welds

Utilizing Synchrotron Radiation for the Characterization of Biodegradable Magnesium Alloys—From Alloy Development to the Application as Implant Material

Effects of nano-SiC particles on the FSSW welded AZ31 magnesium alloy joints

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