Tensile Properties of a Cast Al-Si-Mg Alloy with Reduced Si Content and Cr Addition at High Temperature

Tocci, Marialaura; Donnini, Riccardo; Angella, Giuliano; Gariboldi, Elisabetta; Pola, Annalisa

doi:10.1007/s11665-019-04438-9

Cited by 8 publications

(9 citation statements)

References 50 publications

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“…The high-temperature fatigue results confirm the well-know sure on the AlSi alloys [41,42]; in fact, thermal exposure at 200 ° significantly affects the σfs of the T5-200T and T6R-200T, with res and 91 ± 4 MPa, respectively. The higher T6R-200T ductility redu sensitivity, increasing fatigue strength, as reported in the room t…”

Section: Microstructural and Mechanical Characterizationsupporting

confidence: 86%

Room- and High-Temperature Fatigue Strength of the T5 and Rapid T6 Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion

Zanni

Ceschini

Morri

et al. 2023

Metals

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The AlSi10Mg alloy produced by laser-based powder bed fusion (L-PBF) is widely used to produce high-value-added structural parts subjected to cyclic mechanical loads at high temperatures. The paper aims to widen the knowledge of the room- and high-temperature (200 °C) fatigue behavior of the L-PBF AlSi10Mg alloy by analyzing the fully reversed rotating bending test results on mechanically polished specimens. Two heat-treated conditions are analyzed: T5 (direct artificial aging: 4 h at 160 °C) and novel T6R (rapid solution: 10 min at 510 °C, artificial aging: 6 h at 160 °C). The study highlights that (i) the T6R alloy is characterized by higher fatigue strength at room (108 MPa) and high temperatures (92 MPa) than the T5 alloy (92 and 78 MPa, respectively); (ii) thermal exposure at 200 °C up to 17 h does not introduce macroscopical microstructural variation; (iii) fracture surfaces of the room- and high-temperature-tested specimens show comparable crack initiation, mostly from sub-superficial gas and keyhole pores, and failure propagation mechanisms. In conclusion, the L-PBF AlSi10Mg alloy offers good cyclic mechanical performances under various operating conditions, especially for the T6R alloy, and could be considered for structural components operating at temperatures up to 200 °C.

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Section: Microstructural and Mechanical Characterizationsupporting

confidence: 86%

Room- and High-Temperature Fatigue Strength of the T5 and Rapid T6 Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion

Zanni

Ceschini

Morri

et al. 2023

Metals

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“…This phenomenon stimulates the dislocation motion by climbing and gliding compared to pileup phenomena, leading to increased ductility. [49][50][51] For the T6R OA -200T, the loss of precipitation hardening is the leading cause of the decrease in YS, UTS, and hardness values. Conversely, the negligible effect of OA and high-temperature testing conditions on the e f is probably attributable to an inhomogeneous and localized plastic deformation of the α-Al matrix that, from a macroscopic point of view, avoids an increase in uniform deformation, as observed in the T5 OA -200T.…”

Section: Tensile Propertiesmentioning

confidence: 99%

High‐Temperature Behavior of the Heat‐Treated and Overaged AlSi10Mg Alloy Produced by Laser‐Based Powder Bed Fusion and Comparison with Conventional Al–Si–Mg‐Casting Alloys

et al. 2023

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The continuous research of new technologies and materials to reduce the CO 2 footprint has led to a significant interest in additive manufacturing (AM). In particular, the laser-based powder bed fusion (L-PBF) process represents one of the most attractive technologies currently available for producing complex-shaped components characterized by light structures and high mechanical performance. [1,2] Transportation and energy are probably the main industrial sectors that can significantly benefit from reducing the mass and size of mechanical parts manufactured by the L-PBF process to reduce their environmental impact. [3,4] Fuel injectors, heat sinks, mixing and swirling burner tips, pistons, gas turbines, and aerodynamic parts are, in fact, a few examples of possible L-PBF-produced components. [5][6][7] However, thin-walled and lattice design solutions require the continuous development of new thermally stable materials capable of withstanding the thermomechanical stresses caused by the severe operating conditions (high temperatures and long service times) occurring in automotive, aeronautical, aerospace, and energy applications. [8][9][10] Among the metals used in the L-PBF process, the Al-Si-Mg alloys represent an up-and-coming solution for producing structural components. [11] They meet both mechanical (high strength-to-weight ratio) and production requirements (good fluidity and weldability) compared to other Al-casting alloys, such as the heat-resistant Al-Cu and Al-Zn alloys. [12][13][14][15] The Si content close to the eutectic point reduces the solidification range and increases the powder bed's laser absorption, thus improving the melt pool (MP) fluidity and simplifying the printing process. [16] In addition, the high Mg content enables precipitation of the Mg 2 Si precursor phases during the printing process, further strengthening the Al matrix. [17,18] The AlSi10Mg alloy is currently the most common Al-Si-Mg alloy used in the L-PBF process. The cellular structure of the as-built (AB) L-PBF AlSi10Mg alloy consists of sub-micrometric cells of supersatured α-Al phase surrounded by a eutectic-Si network, which gives high hardness and tensile strength values at the expense of ductility. [19][20][21] However, as widely described by the authors in previous work, [22] the thermally activated diffusion processes alter the metastable microstructure of the AB alloy, acting on the size and morphology of the dispersed (nano-sized Si precipitates and precursors of the Mg 2 Si equilibrium phase) and aggregated (eutectic-Si network) strengthening phases. Consequently, given the complexity of the topic, the literature in recent years has mainly focused on the effects of process parameters and heat treatments on the microstructure and the mechanical properties at room temperature (RT) of the L-PBF

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“…Additionally, the literature shows that chromium contents in AlÀ MgÀ Si alloy can produce a dispersion-strengthening phase, leading to improved hardness and corrosion resistance of the alloy at room temperature. Meanwhile, the chromium dispersion phase exists well at high temperatures, making it very valuable for the optimization of heat treatment processes [19]. However, not all alloying elements similar to chromium can cause a similar strengthening effect when added to cast aluminum alloy.…”

Section: Microstructure Analysis Of Chromium Containing Phasesmentioning

confidence: 99%

Effect of chromium content on microstructure and properties of casting Al‐7Si‐0.35Mg‐0.02Sr alloy

Ling

Shi

et al. 2022

Materialwissenschaft Werkst

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The effect of the addition of chromium between 0.1 % and 0.3 % on the structure and properties of Al-7Si-0.35Mg-0.02Sr alloy was studied. The results show that as the chromium content increases, the alloy grains are refined, and the grains appear fine equiaxed after 0.2 % chromium addition. At the same time, chromium combines with iron to form AlCrFeSi phase, which significantly improves the iron phase morphology, making it change from needle shape to fish bone shape. In the aging stage, the Al 13 Cr 4 Si 4 phase is dispersed in the alloy, and its phase relationship with the matrix is semi-coherent and non-coherent. When the chromium content continues to increase, the degree of dispersion of the Al 13 Cr 4 Si 4 phase is higher, but the performance of the alloy decreases, because the chromium containing precipitate phase consumes magnesium and silicon solute atoms from the nearby melt, making the amount of magnesium silicide decrease. The Al-7Si-0.35Mg-0.02Sr alloy with 0.2 % chromium showed the best mechanical properties (ultimate tensile strength, yield strength, elongation and hardness).

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Tensile Properties of a Cast Al-Si-Mg Alloy with Reduced Si Content and Cr Addition at High Temperature

Cited by 8 publications

References 50 publications

Room- and High-Temperature Fatigue Strength of the T5 and Rapid T6 Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion

Room- and High-Temperature Fatigue Strength of the T5 and Rapid T6 Heat-Treated AlSi10Mg Alloy Produced by Laser-Based Powder Bed Fusion

High‐Temperature Behavior of the Heat‐Treated and Overaged AlSi10Mg Alloy Produced by Laser‐Based Powder Bed Fusion and Comparison with Conventional Al–Si–Mg‐Casting Alloys

Effect of chromium content on microstructure and properties of casting Al‐7Si‐0.35Mg‐0.02Sr alloy

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