Effect of additional magnesium on mechanical and high-cycle fatigue properties of 6061-T6 alloy

Takahashi, Yoshihiro; Shikama, Takahiro; Nakamichi, Ryota; Kawata, Yoshimasa; Kasagi, Naoki; Nishioka, Hironari; Kita, Syuzaburo; Takuma, Masanori; Noguchi, Hiroshi

doi:10.1016/j.msea.2015.06.051

Cited by 10 publications

(8 citation statements)

References 38 publications

(41 reference statements)

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“…The fatigue properties of aluminum alloy joints play an important role in the safety and reliability of structural assemblies [ 6 ], with up to 90% of engineering constructions failing because of fatigue [ 7 ]. Researchers have found that excess solute Mg can improve the fatigue strength and fatigue life of 6xxx alloys [ 8 , 9 , 10 , 11 , 12 ]. Takahashi [ 9 ] reported that the fatigue strength and fatigue life of 6xxx alloys can be improved by adding excess Mg, so that Mg exists in solid solution in the matrix.…”

Section: Introductionmentioning

confidence: 99%

Welding of AA6061-T6 Sheets Using High-Strength 4xxx Fillers: Effect of Mg on Mechanical and Fatigue Properties

et al. 2023

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Al-Si-Mg 4xxx filler metals are widely used in aluminum welding owing to their excellent weldability and capability for strength enhancement by heat treatment. However, weld joints with commercial Al-Si ER4043 fillers often exhibit poor strength and fatigue properties. In this study, two novel fillers were designed and prepared by increasing the Mg content in 4xxx filler metals, and the effects of Mg on the mechanical and fatigue properties were studied under as-welded and post-weld heat-treated (PWHT) conditions. AA6061-T6 sheets were used as the base metal and welded by gas metal arc welding. The welding defects were analyzed using X-ray radiography and optical microscopy, and the precipitates in the fusion zones were studied using transmission electron microscopy. The mechanical properties were evaluated using the microhardness, tensile, and fatigue tests. Compared to the reference ER4043 filler, the fillers with increased Mg content produced weld joints with higher microhardness and tensile strength. Joints made with fillers with high Mg contents (0.6–1.4 wt.%) displayed higher fatigue strengths and longer fatigue lives than joints made with the reference filler in both the as-welded and PWHT states. Of the joints studied, joints with the 1.4 wt.% Mg filler exhibited the highest fatigue strength and best fatigue life. The improved mechanical strength and fatigue properties of the aluminum joints were attributed to the enhanced solid-solution strengthening by solute Mg in the as-welded condition and the increased precipitation strengthening by β″ precipitates in the PWHT condition.

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Section: Introductionmentioning

confidence: 99%

Welding of AA6061-T6 Sheets Using High-Strength 4xxx Fillers: Effect of Mg on Mechanical and Fatigue Properties

et al. 2023

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“…With the fixed particle volume fraction of 20% and fixed particle number of 10, models with random and clustered particle distributions were created. In these where aluminum is matrix and silicon Carbide and Titanium Diboride are taken as reinforcement in these composites [11]. Figure 1…”

Section: Model Developmentmentioning

confidence: 99%

“…Aluminum as matrix material properties for the following matrix which it has shown very excellent in nature and possess light weight. The properties which are taken for the composites are Youngs modulus=75GPa, Poisson's ratio=0.3 and Yield stress= 250 N/m2 and similarly, Young's modulus = 410 GPa, and Poisson's ratio = 0.14 of silicon carbide as reinforcementand also Poisson's ratio is 0.15 and Youngs modulus is 430 GPa of titanium diboride is used as reinforcement can exhibit light weight to the structure [11][12], good resistance and increases the strength of the composite. After adding properties now, we must add section assignment to the matrix.…”

Section: Materials Propertiesmentioning

confidence: 99%

Study On Behaviour Of Aluminium Metal Matrix Composite Reinforced With Silicon Carbide And Titanium Diboride.

Kora

Gorantla

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Advanced designed materials like metal matrix composites (MMC) consists of at least two constituent parts, a matrix and reinforcement of different materials such as metals, fibers, glass, organic compounds, or ceramics. An MMC can exhibit various enhanced properties like lightweight, high-specific strength and better ductility when compared with a single material. They have an advantage of the increasing mechanical and physical characteristics of the composite by varying the reinforcement percentages by volume fractions or orientation of fibers or laminates. The most popular materials such as aluminum, titanium, magnesium, and silicon carbide are possible reinforcement materials with aluminum as matrix. This work is mainly focused on study on behaviour of Aluminum Metal Matrix Composite, reinforced with Silicon Carbide and Titanium diboride for various kinds of loads and optimization for tensile strength and ductility. In this work two composite models of size 60µm * 60µm * 60µm with a reinforcement volume proportion of 20% of SiC and TiB2 were compared with the use of FEM tool (ABAQUS CAE). The tool is basically used for assigning different material properties such as young’s modulus, Poisson’s ratio, yield stress & different loads and to extract the results in the form of various stresses and strains on the modeled aluminum metal matrix composite (AMMC). The test results showed that the AMMC with SiC as reinforcement has better young’s modulus and tensile strength than AMMC with TiB2.

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“…The occurrence of strain-age hardening at a crack tip has been recognized to improve the non-propagation limit of fatigue cracking. For instance, solute Mg in Al alloys (Shikama et al 2012;Zeng et al 2012;Takahashi et al 2015) and solute carbon in steel (Li et al 2016(Li et al , 2017b(Li et al , 2018Kishida et al 2018), both of which trigger strain aging, significantly improve the K th of small crack growth. Figure 10.13 shows an example of the carbon effect on K th in steel.…”

Section: Strain-age Hardeningmentioning

confidence: 99%

Microstructural Crack Tip Plasticity Controlling Small Fatigue Crack Growth

Koyama

Nishikawa

Tsuzaki

2022

The Plaston Concept

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In this chapter, we present a metallurgical–mechanical mechanism-based strategy for the design of fatigue-resistant metals. Specifically, we elucidate the importance of the metallurgical microstructure in a mechanical singular field (crack tip). The fatigue crack growth resistance is controlled through the crack tip “plasticity”, and the effect of the associated microstructure becomes significant when the crack is “small (or short)”. More importantly, the resistance to small crack growth determines a major portion of fatigue life and strength. Therefore, the microstructural crack tip plasticity is a key breakthrough to the development of fatigue-resistant metals. As successful examples of this concept, we introduce the effects of grain refinement, martensitic transformation, strain aging, dislocation planarity enhancement, and microstructure heterogeneity on small fatigue crack growths.

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Effect of additional magnesium on mechanical and high-cycle fatigue properties of 6061-T6 alloy

Cited by 10 publications

References 38 publications

Welding of AA6061-T6 Sheets Using High-Strength 4xxx Fillers: Effect of Mg on Mechanical and Fatigue Properties

Welding of AA6061-T6 Sheets Using High-Strength 4xxx Fillers: Effect of Mg on Mechanical and Fatigue Properties

Study On Behaviour Of Aluminium Metal Matrix Composite Reinforced With Silicon Carbide And Titanium Diboride.

Microstructural Crack Tip Plasticity Controlling Small Fatigue Crack Growth

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