Grain Structure Formation and Texture Modification through Multi-Pass Friction Stir Processing in AlSi10Mg Alloy Produced by Laser Powder Bed Fusion

Heidarzadeh, Akbar; Javidani, Mousa; Mofarrehi, Mohammadreza; Motalleb-nejad, Pouyan; Mohammadzadeh, Roghayeh; Jafarian, H.R.; Chen, X.-Grant

doi:10.3390/ma16030944

Cited by 6 publications

(3 citation statements)

References 34 publications

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“…As per previous studies, the grain size post the L-PBF process typically falls within the microscale [13,39]. However, to substantially influence thermal conductivity, the grain size must be reduced further to the nanoscale, or more precisely, to a size comparable to the mean free path of heat carriers such as electrons and phonons, which exists at the atomic level [40][41][42][43]. Consequently, grain boundary (grain size) scattering is likely not the primary factor affecting the thermal diffusivity/conductivity of the L-PBF Ti-6Al-4V alloy.…”

Section: Resultsmentioning

confidence: 78%

Thermophysical Properties of Laser Powder Bed Fused Ti-6Al-4V and AlSi10Mg Alloys Made with Varying Laser Parameters

et al. 2023

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This study investigated the influence of diverse laser processing parameters on the thermophysical properties of Ti-6Al-4V and AlSi10Mg alloys manufactured via laser powder bed fusion. During fabrication, the laser power (50 W, 75 W, 100 W) and laser scanning speed (0.2 m/s, 0.4 m/s, 0.6 m/s) were adjusted while keeping other processing parameters constant. Besides laser processing parameters, this study also explored the impact of test temperatures on the thermophysical properties of the alloys. It was found that the thermophysical properties of L-PBF Ti-6Al-4V alloy samples were sensitive to laser processing parameters, while L-PBF AlSi10Mg alloy showed less sensitivity. In general, for the L-PBF Ti-6Al-4V alloy, as the laser power increased and laser scan speed decreased, both thermal diffusivity and conductivity increased. Both L-PBF Ti-6Al-4V and L-PBF AlSi10Mg alloys demonstrated similar dependence on test temperatures, with thermal diffusivity and conductivity increasing as the test temperature rose. The CALPHAD software Thermo-Calc (2023b), applied in Scheil Solidification Mode, was utilized to calculate the quantity of solution atoms, thus enhancing our understanding of observed thermal conductivity variations. A detailed analysis revealed how variations in laser processing parameters and test temperatures significantly influence the alloy’s resulting density, specific heat, thermal diffusivity, and thermal conductivity. This research not only highlights the importance of processing parameters but also enriches comprehension of the mechanisms influencing these effects in the domain of laser powder bed fusion.

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Section: Resultsmentioning

confidence: 78%

Thermophysical Properties of Laser Powder Bed Fused Ti-6Al-4V and AlSi10Mg Alloys Made with Varying Laser Parameters

et al. 2023

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“…The regions closer to the outer diameter of the shoulder experience higher strain intensity, whereas increased heat input beneath the center of the pin leads to some grain growth in the central areas. [ 49 ] The average grain sizes, calculated from different coordinates within each respective zone, are enumerated in Figure 3a.…”

Section: Resultsmentioning

confidence: 99%

Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Abbasi,

Zarei‐Hanzaki,

Charkhchian

et al. 2024

Adv Eng Mater

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The present study aims to investigate the effect of friction stir processing (FSP) on the microstructural evolutions and mechanical properties of a nonequiatomic interstitial high‐entropy alloy (HEA). To achieve this, an as‐cast FeMnCoCrN interstitial HEA undergoes FSP to modify the as‐cast microstructure and investigate the resulting effects on mechanical properties. The grain size, sub‐boundaries, martensite fraction, and accommodated strain exhibit a gradient from the base metal (BM) to the stir zone (SZ). As a result of FSP, the average grain size in the upper SZ is significantly decreased from ≈700 μm in BM to 1.5 μm, which is around 500 times finer than that of the BM. Furthermore, the martensitic transformation in a single metastable face‐centered‐cubic phase specifically occurs in the thermomechanical‐affected and heat‐affected zones. Continuous and geometric dynamic recrystallizations triggered by FSP lead to the development of a refined equiaxed microstructure. This gradient microstructure, in turn, plays a pivotal role in achieving significantly improved mechanical properties when compared to the as‐cast microstructure. Remarkably, the yield strength doubles, the ultimate tensile strength increases from 548 to 852 MPa, and ductility increases by 16%.

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“…Specifically, it typically consists of several stages and may involve several different microstructural mechanisms. Those include the geometric effect of strain [3][4][5], continuous recrystallization [6][7][8][9][10][11], or geometric recrystallization [3,[12][13][14][15]. Remarkably, the stir zone material may experience secondary deformation associated with the tool shoulder [16].…”

Section: Introductionmentioning

confidence: 99%

Grain Structure Evolution in 6013 Aluminum Alloy during High Heat-Input Friction-Stir Welding

Kalinenko,

Dolzhenko,

Malopheyev

et al. 2023

Materials

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This work was undertaken to evaluate the influence of friction-stir welding (FSW) under a high-heat input condition on microstructural evolution. Given the extreme combination of deformation conditions associated with such an FSW regime (including the highest strain, temperature, and strain rate), it was expected to result in an unusual structural response. For this investigation, a commercial 6013 aluminum alloy was used as a program material, and FSW was conducted at a relatively high spindle rate of 1100 rpm and an extremely low feed rate of 13 mm/min; moreover, a Ti-6Al-4V backing plate was employed to reduce heat loss during welding. It was found that the high-heat-input FSW resulted in the formation of a pronounced fine-grained layer at the upper weld surface. This observation was attributed to the stirring action exerted by the shoulder of the FSW tool. Another important issue was the retardation of continuous recrystallization. This interesting phenomenon was explained in terms of a competition between recrystallization and recovery at high temperatures. Specifically, the activation of recovery should reduce dislocation density and thus retard the development of deformation-induced boundaries.

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Grain Structure Formation and Texture Modification through Multi-Pass Friction Stir Processing in AlSi10Mg Alloy Produced by Laser Powder Bed Fusion

Cited by 6 publications

References 34 publications

Thermophysical Properties of Laser Powder Bed Fused Ti-6Al-4V and AlSi10Mg Alloys Made with Varying Laser Parameters

Thermophysical Properties of Laser Powder Bed Fused Ti-6Al-4V and AlSi10Mg Alloys Made with Varying Laser Parameters

Revealing the Effects of Friction Stir Processing on the Microstructural Evolutions and Mechanical Properties of As‐Cast Interstitial FeMnCoCrN High‐Entropy Alloy

Grain Structure Evolution in 6013 Aluminum Alloy during High Heat-Input Friction-Stir Welding

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