Effect of Cu addition on overaging behaviour, room and high temperature tensile and fatigue properties of A357 alloy

Ceschini, Lorella; Messieri, Simone; Morri, Alessandro; Seifeddine, Salem; Toschi, Stefania; Zamani, Mohammadreza

doi:10.1016/s1003-6326(20)65427-9

Cited by 13 publications

(23 citation statements)

References 32 publications

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“…The results of the high-temperature mechanical characterization were compared to those of previous studies carried out by the authors on various Al-casting alloys developed explicitly for high-temperature applications. [27][28][29][30]…”

Section: Doi: 101002/adem202201238mentioning

confidence: 99%

“…Bidirectional stripes scan strategy of 67°rotation between subsequent layers and remelted contour zone strategy at the end of each scanning metastable microstructure of the typical average temperatures (200 and 210 °C) experienced by a high-performance motorbike engine during a race [30] and the effects of peak operating temperature (245 °C) inside the cylinder. [9] Hardness values were measured through the Brinell test (hereinafter HB 10 ) with a 2.5 mm diameter steel ball and a 62.5 kgf load, according to the ASTM E10-18 standard.…”

Section: L-pbf Scan Strategymentioning

confidence: 99%

“…Even though TEM analysis would be necessary for evaluating the effects of OA on nano-sized Si-and Mg 2 Si-strengthening precipitates, several authors agree that prolonged thermal exposure generates diffusion-driven phenomena and a rapid coarsening of the reinforcing precipitates (Ostwald ripening mechanism) in heat-treated Al-casting alloys [8,9,27,28,30] and heat-treated L-PBF AlSi10Mg alloy. [17,20,47] These phenomena lead to a microstructure containing larger but fewer precipitates that offer less contribution to alloy strengthening and hardness due to 1) lower precipitate/matrix interfacial area; 2) lower density of obstacle to dislocation motion, and 3) lower coherence between the strengthening precipitates and α-Al matrix.…”

Section: Effects Of Overaging On Hardness and Microstructurementioning

confidence: 99%

“…Tensile tests were performed at 200 °C on overaged (210 °C for 41 h) samples to compare the results of the tests with the experimental data of previous mechanical characterizations carried out by the authors on Al-casting alloys. [27][28][29][30]49]…”

Section: Tensile Testsmentioning

confidence: 99%

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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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Section: Doi: 101002/adem202201238mentioning

confidence: 99%

Section: L-pbf Scan Strategymentioning

confidence: 99%

Section: Effects Of Overaging On Hardness and Microstructurementioning

confidence: 99%

Section: Tensile Testsmentioning

confidence: 99%

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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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“…Conventional cast A356 or A357 T6 alloys suffer a non-negligible decrease in mechanical strength if exposed to temperatures close to 200 °C due to coarsening of reinforcing phases related to over-aging [ 4 ]. For high-temperature applications, alloys containing a certain amount of Cu assure better thermal stability [ 4 , 5 ]. However, the effect of thermal exposure on the microstructure and mechanical properties of AlSi7Mg alloys processed by innovative additive manufacturing technologies, like laser-based powder bed fusion (PBF-LB), is currently lacking.…”

Section: Introductionmentioning

confidence: 99%

On the Role of Microstructure and Defects in the Room and High-Temperature Tensile Behavior of the PBF-LB A357 (AlSi7Mg) Alloy in As-Built and Peak-Aged Conditions

et al. 2023

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Additive processes like Laser Beam Powder Bed Fusion (PBF-LB) result in a distinctive microstructure characterized by metastability, supersaturation, and finesse. Post-process heat treatments modify microstructural features and tune mechanical behavior. However, the exposition at high temperatures can induce changes in the microstructure. Therefore, the present work focuses on the analyses of the tensile response at room and high (200 °C) temperature of the A357 (AlSi7Mg0.6) alloy processed by PBF-LB and subjected to tailored T5 (direct aging) and T6R (rapid solution treatment, quenching, and aging) treatments. Along with the effect of microstructural features in the as-built T5 and T6R alloy, the role of typical process-related defects is also considered. In this view, the structural integrity of the alloy is evaluated by a deep analysis of the work-hardening behavior, and quality indexes have been compared. Results show that T5 increases tensile strength at room temperature without compromising ductility. T6R homogenizes the microstructure and enhances the structural integrity by reducing the detrimental effect of defects, resulting in the best trade-off between strength and ductility. At 200 °C, tensile properties are comparable, but if resilience and toughness moduli are considered, as-built and T5 alloys show the best overall mechanical performance.

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Corrosion and tribocorrosion protection of novel PEO coatings on a secondary cast Al-Si alloy: Influence of polishing and sol-gel sealing

et al. 2022

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Effect of Cu addition on overaging behaviour, room and high temperature tensile and fatigue properties of A357 alloy

Cited by 13 publications

References 32 publications

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

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

On the Role of Microstructure and Defects in the Room and High-Temperature Tensile Behavior of the PBF-LB A357 (AlSi7Mg) Alloy in As-Built and Peak-Aged Conditions

Corrosion and tribocorrosion protection of novel PEO coatings on a secondary cast Al-Si alloy: Influence of polishing and sol-gel sealing

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