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Nano-level mechanical and tribological behavior of additively manufactured AlSi10Mg plates

Murugesan Periyakaruppan, Satheeshkumar V., Jeyaprakash N., Prabu G., Yang Che-Hua

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 1

art. no. e62, 2023

EN

This work focuses on the study of the selective laser melting (SLM) fabrication parameter of AlSi10Mg specimen. SLM parameters such as Power and scanning speed are varied to identify the defect-free samples. In addition, X-ray diffraction (XRD) analysis is carried out on the AM AlSi10Mg specimen to study the presence of phase. The results reveal that the Al matrix possesses (200), (220) and (311) phases whereas the AlSil0Mg powder has (111), (200), (220) and (311) phases. The microstructural characterization based on FESEM, TEM and EBSD analysis is carried out. The cross-section of the molten pool appears as a semi-cylindrical shape in the section that is parallel to the plane of powder deposition. The height, width and depth of the molten pool are measured as 150 ± 10 μm, 450 ± 10 μm and 50 ± 10 μm, respectively. TEM analysis reveals that the Si-precipitate and the eutectic Si element of the AM AlSi10Mg specimen are clearly formed in the AM AlSi10Mg specimen. Si precipitate spread within the grains whereas, the eutectic Si element is present at the grain boundary of the specimen. Then, the nanohardness and nanowear behavior are analyzed. Further, the influence of strain rate on the tensile strength is investigated. These mechanical tests are carried out on the defect-free AM AlSi10Mg specimen to assess its maximum performance. Very rough as well as irregular fracture surfaces are observed in the tensile test AM AlSi10Mg specimen. In addition to it, its magnified image reveals that the specimen fracture in the form of river patterns and contains a lot of micron-sized pores throughout the fracture surfaces.

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Effects of equal channel angular pressing and heat treatments on the microstructures and mechanical properties of selective laser melted and cast AlSi10Mg alloys

Snopiński Przemysław, Król Mariusz, Pagáč Marek, Petrů Jana, Hajnyš Jiří, Mikuszewski Tomasz, Tański Tomasz

Archives of Civil and Mechanical Engineering

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2021

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Vol. 21, no. 3

77--94

EN

This study investigated the impact of the equal channel angular pressing (ECAP) combined with heat treatments on the microstructure and mechanical properties of AlSi10Mg alloys fabricated via selective laser melting (SLM) and gravity casting. Special attention was directed towards determining the effect of post-fabrication heat treatments on the microstructural evolution of AlSi10Mg alloy fabricated using two different routes. Three initial alloy conditions were considered prior to ECAP deformation: (1) as-cast in solution treated (T4) condition, (2) SLM in T4 condition, (3) SLM subjected to low-temperature annealing. Light microscopy, transmission electron microscopy, X-ray diffraction line broadening analysis, and electron backscattered diffraction analysis were used to characterize the microstructures before and after ECAP. The results indicated that SLM followed by low-temperature annealing led to superior mechanical properties, relative to the two other conditions. Microscopic analyses revealed that the partial-cellular structure contributed to strong work hardening. This behavior enhanced the material’s strength because of the enhanced accumulation of geometrically necessary dislocations during ECAP deformation.

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Effect of Post-Heat Treatment on the Wear Properties of AlSi10Mg Alloy Manufactured by Selective Laser Melting

Park Tae-Hyun, Baek Min-Seok, Sohn Yongho, Lee Kee-Ahn

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 3

1073--1080

EN

Microstructure and wear property of AlSi10Mg alloy manufactured by selective laser melting (SLM) were investigated. Also, the effect of post heat treatment on the mechanical and wear properties was examined. Two kinds of heat treatments (direct aging (DA) and T6) were separately conducted to SLM AlSi10Mg alloy. As-built alloy had a cellular structure formed inside the moltenpool. Eutectic Si was also observed at the cellular boundary in as-built alloy. After DA heat treatment, the cellular structure still remained, and a large amount of nano-size Si particles were newly formed inside the cell structure. Both molten pool and cellular structure disappeared, and the size of Si increased in T6 alloy. The values of Vickers hardness measured as 139.4 HV (DA alloy), 128.0 HV (As-built alloy) and 85.1 HV (T6 alloy), respectively. However, concerning to wear property, T6 alloy showed better wear resistance than other alloys. The correlation between microstructure and wear mechanism of SLM AlSi10Mg alloy was also discussed.

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A comprehensive study of mechanical and acoustic properties of selective laser melting material

Barile Claudia, Casavola Caterina, Moramarco Vincenzo, Vimalathithan Paramsamy Kannan

Archives of Civil and Mechanical Engineering

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2020

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Vol. 20, no. 1

30--40

EN

In this research work, four groups of selective laser melted specimens were built from AlSi10Mg-0403 powder. Each group represents the direction with respect to the bed in which the specimens are built (X, Y, Z and 45° orientation). The mechanical properties of the specimens are characterized in terms of yield strength, ultimate tensile strength, Young’s modulus and elongation at break. In addition to that, the acoustic emission (AE) during the testing was monitored using wide-band high-accuracy piezoelectric sensors. The AE results were related to the mechanical characteristics of the specimens in terms of the acoustic parameter-based data, the peak amplitude, cumulative energy and count rate. The mechanical results show that the specimens built along the z direction have relatively lower strength and it can be attributed to the borderline porosity formed during the SLM process. The acoustic results can identify the critical points of failure under loading. The AE technique proves to be a powerful tool in characterizing the mechanical property and can unveil the concealed information which cannot be identified directly from the mechanical results.

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Poprawa właściwości mechanicznych elementów wykonanych z proszku AlSi10Mg metodami SLS/SLM przez zagęszczenie warstwy wierzchniej spieków

Stwora A., Skrabalak G., Maszybrocka J.

Mechanik

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2017

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R. 90, nr 5-6

426--431

PL

W artykule zaprezentowano wyniki badań mających na celu poprawę właściwości mechanicznych elementów wykonanych ze stopu AlSi10Mg metodami selektywnego spiekania//topienia laserowego (SLS/SLM). W ramach prac sprawdzono wpływ zarówno obróbki wykończeniowej (toczenia na twardo oraz nagniatania tocznego), jak i orientacji próbek względem powierzchni płyty bazowej urządzenia SLS/SLM (0°, 45°, 90°) na wytrzymałość elementów. Przedstawiono też wyniki badań mikrostruktury i gęstości wykonanych elementów oraz określono wpływ obróbki wykończeniowej na stan warstwy wierzchniej.

EN

The paper presents results of experiments including application of finish machining (turning and burnishing) of samples produced with SLS/SLM, as well as influence of the sample orientation against the surface of base plate during building process (0°, 45°, 90°) on tensile strength of the produced samples. There are also presented results of microstructure examination and results of density measurements. The paper also discusses the state of samples surface layer depending on the applied finishing method.