Effects of heat treatment on microstructure and mechanical properties of SLMed Sc-modified AlSi10Mg alloy

Chen, Yuming; Wang, Linzhi; Feng, Zhongxue; Zhang, Wanneng

doi:10.1016/j.pnsc.2021.08.003

Cited by 36 publications

(13 citation statements)

References 26 publications

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“…At the same temperature, Baek et al [ 157 ] affirmed that the precipitation of these particles can cause a uniform distribution of the dislocation, unlike the HT performed at 225 °C, which induces initial destruction of the Si-eutectic network. The openings within this network become larger as the temperature increases from 240 to 300 °C during the SR HT due to the Ostwald ripening effect ( Figure 21 a–c) [ 139 , 155 , 159 , 160 , 163 , 164 ].…”

Section: L-pbfed Alsi10mg: Microstructurementioning

confidence: 99%

“…The decreasing trend of UTS and YS values, opposite to the elongation values, are appropriately described by [ 157 , 164 , 165 , 176 ]. Starting from the as-built samples and the direct aged samples at low temperature (where no microstructural variation was observed), Li et al [ 176 ] proposed three deformation scenarios ( Figure 24 ) that deviated from the Orowan bowing mechanisms around the Si particles and that could justify the tensile strength behavior.…”

Section: L-pbfed Alsi10mg: Mechanical Propertiesmentioning

confidence: 99%

“…The Orowan strengthening was expressed by Dieter [ 185 ], as follows:

where

(GPa) is the Al shear modulus (26.5, [ 158 , 183 ]),

is the Burgers vector (0.286 nm), [ 158 , 184 ],

is the interparticle spacing (nm)

[ 148 ], and

is the particle radius (nm). Figure 25 a,b show the schematic interaction between a dislocation and the cell boundaries via Orowan looping in a full-cellular AlSi10Mg structure [ 164 ]. When an applied load moves a large dislocation (same magnitude of the grain size) into the AlSi10Mg microstructure, it will be pinned by the Si-eutectic network, forming both dislocation loops around the Si-particles and a new dislocation ( Figure 24 a and Figure 25 b).…”

Section: L-pbfed Alsi10mg: Mechanical Propertiesmentioning

confidence: 99%

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Additive Manufacturing of AlSi10Mg and Ti6Al4V Lightweight Alloys via Laser Powder Bed Fusion: A Review of Heat Treatments Effects

Ghio

Cerri

2022

Materials

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Laser powder bed fusion (L-PBF) is an additive manufacturing technology that is gaining increasing interest in aerospace, automotive and biomedical applications due to the possibility of processing lightweight alloys such as AlSi10Mg and Ti6Al4V. Both these alloys have microstructures and mechanical properties that are strictly related to the type of heat treatment applied after the L-PBF process. The present review aimed to summarize the state of the art in terms of the microstructural morphology and consequent mechanical performance of these materials after different heat treatments. While optimization of the post-process heat treatment is key to obtaining excellent mechanical properties, the first requirement is to manufacture high quality and fully dense samples. Therefore, effects induced by the L-PBF process parameters and build platform temperatures were also summarized. In addition, effects induced by stress relief, annealing, solution, artificial and direct aging, hot isostatic pressing, and mixed heat treatments were reviewed for AlSi10Mg and Ti6AlV samples, highlighting variations in microstructure and corrosion resistance and consequent fracture mechanisms.

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Section: L-pbfed Alsi10mg: Microstructurementioning

confidence: 99%

Section: L-pbfed Alsi10mg: Mechanical Propertiesmentioning

confidence: 99%

“…The Orowan strengthening was expressed by Dieter [ 185 ], as follows:

where

(GPa) is the Al shear modulus (26.5, [ 158 , 183 ]),

is the Burgers vector (0.286 nm), [ 158 , 184 ],

is the interparticle spacing (nm)

[ 148 ], and

Section: L-pbfed Alsi10mg: Mechanical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Additive Manufacturing of AlSi10Mg and Ti6Al4V Lightweight Alloys via Laser Powder Bed Fusion: A Review of Heat Treatments Effects

Ghio

Cerri

2022

Materials

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“…Al-Si-Mg alloys combine the decrease in melting temperature, solidification interval, and thermal shrinkage, as well as the increase in fluidity resulting from the addition of Si, with the ability to increase mechanical strength generated by precipitation hardening provided by the association of small amounts of Mg and proper heat treatment, enabling the application of these alloys in structural components [1,2]. This combination of properties gives the Al-Si-Mg alloys high versatility of applications in the aerospace, aeronautical, and automotive industries [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…In the present study, Sc was chosen as a microaddition element in the AlSi10Mg alloy. This element may act in grain refinement due to the formation of the Al3Sc intermetallic, which is the same that can be formed for hardening through heat treatment [2]. Supersaturation of Sc in the 𝛼𝛼-Al matrix is only obtained at solidification cooling rates higher than 10 K/s [12].…”

Section: Introductionmentioning

confidence: 99%

Handling Microstructural Changes and Hardness of the AlSi10Mg Alloy Through SC Doping and Direct Aging Treatment

Martinez¹,

Santos²,

Leal³

et al. 2023

Preprint

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The effects of 0.4wt.% Sc addition on a typical Al-Si10-Mg alloy were systematically investigated in the present research. Samples with and without Sc produced refined dendritic arranged microstructures with sensitivity to the aging treatment after solidification, particularly in the case of the alloy without Sc. After being exposed to 300°C for 90 minutes, the dendritic spacing nearly doubled in the Al-10wt.%Si-0.45wt.%Mg samples. The rapidly solidified microstructures were constituted by the -Al dendritic phase surrounded by eutectic phases/intermetallics such as Si, Mg2Si and Al3Sc (in the case of the alloy containing Sc). 255°C and 300°C were deemed most appropriate temperatures for aging treatments, with four exposure times of up to 120 minutes tested for each alloy. The heat treatments allowed the Vickers hardness profiles to be plotted and compared. Moreover, in order to detect both Sc- and Mg- precipitates after aging, specific samples have been prepared for either SEM or TEM analyses. At first, the results pointed to a strong precipitate-related hardening effect formed as a result of the Sc addition to the alloy. All samples containing Sc showed a higher hardness value when compared to their respective treated samples without Sc. Secondly, when comparing the Al-10Si-Mg-Sc alloy samples among themselves after being treated at different conditions, high temperatures and excessive treatment times can become detrimental to the hardness. This was due to the growth of larger Sc-bearing precipitates of approximately 1 µm in size under such conditions, having less pronounced hardening effect. The best condition (255°C for 60 min) for as centrifuged samples in Cu-mold produced very fine dispersion of Mg- and Sc- intermetallics (~200 nm in size) with a peak hardness of 110 HV.

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Effects of Sc Addition and Direct Aging Treatment on Microstructure and Hardness of AlSi10Mg Alloy

et al. 2023

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Cu‐mold centrifugal cast processing is employed as a rapid solidification method for producing samples with and without Sc. The Al–Si–Mg and Al–Si–Mg–Sc alloy samples are exposed to direct aging treatments varying temperature and time to verify the microstructural changes. Both rapidly solidified samples and as‐aged samples are characterized by a number of methods, including optical microscopy, SEM–EDS, transmission Electron Microscopy (TEM)–EDS, TEM–HAADF, X‐ray diffraction (XRD), differential scanning calorimetry (DSC), and Vickers hardness. At first, the results point to a strong precipitate‐related hardening effect formed as a result of the Sc addition to the alloy. All samples containing Sc show a higher hardness value when compared to their respective treated samples without Sc. Second, when comparing the Al–10Si–Mg–0.4Sc alloy samples among themselves after being treated at different conditions, high temperatures, and excessive treatment times are recognized as detrimental to the hardness. This is due to the growth of larger Sc‐bearing precipitates of approximately 1 μm in size under such conditions, having lower efficiency in pinning dislocations during loading. The best aging condition is 255 °C for 60 min, which produces a very fine dispersion of Mg and Sc intermetallics (200 nm in size) with a peak hardness of 110 HV.

show abstract

Effects of heat treatment on microstructure and mechanical properties of SLMed Sc-modified AlSi10Mg alloy

Cited by 36 publications

References 26 publications

Additive Manufacturing of AlSi10Mg and Ti6Al4V Lightweight Alloys via Laser Powder Bed Fusion: A Review of Heat Treatments Effects

Additive Manufacturing of AlSi10Mg and Ti6Al4V Lightweight Alloys via Laser Powder Bed Fusion: A Review of Heat Treatments Effects

Handling Microstructural Changes and Hardness of the AlSi10Mg Alloy Through SC Doping and Direct Aging Treatment

Effects of Sc Addition and Direct Aging Treatment on Microstructure and Hardness of AlSi10Mg Alloy

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