Microstructure of selective laser melted AlSi10Mg alloy

Liu, Xihe; Chen, Zhao; Zhou, Xin; Shen, Zhijian; Liu, Wei

doi:10.1016/j.matdes.2019.107677

Cited by 298 publications

(128 citation statements)

References 41 publications

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“…The melting pools elongated in the deposition plane can be observed, also revealing the underneath layers formed at different orientations as a consequence of the printing strategy. In agreement with the literature, at the pool boundary a coarser microstructure rich in Al can be detected [53]. The microstructure along the building direction (z) is reported in Fig.…”

Section: Metallographic Characterizationsupporting

confidence: 91%

Evaluation on the fatigue behavior of sand-blasted AlSi10Mg obtained by DMLS

Pola

Battini

Tocci

et al. 2019

Frattura Ed Integrità Strutturale

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Fatigue tests were performed on sand-blasted AlSi10Mg samples produced by Direct Metal Laser Sintering (DMLS) of powders. The effect of sand-blasting on surface properties was evaluated by roughness and residual stresses measurements, together with morphological analysis, in comparison with asfabricated condition. An evident improvement of surface finishing was observed after sand-blasting, which also lead to the presence of compressive residual stress on the external surface of samples, as revealed by XRD measurements. Furthermore, defects analysis allowed the identification of a uniform distribution of porosities in the cross section whereas larger porosities seem more abundant close to the surface. It was found that the tested material exhibits good fatigue resistance, supporting the positive role of sand-blasting as a simple post-processing treatment. Superficial defects are the preferential crack initiation sites, as demonstrated by SEM analysis of fracture surfaces.

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Section: Metallographic Characterizationsupporting

confidence: 91%

Evaluation on the fatigue behavior of sand-blasted AlSi10Mg obtained by DMLS

Pola

Battini

Tocci

et al. 2019

Frattura Ed Integrità Strutturale

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“…Hence, these regions could maintain at higher temperatures for longer periods, causing slower cooling rates and thus allowing the microstructures to coarsen. This phenomenon is common in SLM AlSi10Mg, which has been observed in other AM alloys [22,41,44]. In addition, partially broken and coarsened eutectic Si network could also be observed at the MPBs (dashed red lines in Fig.…”

Section: Microstructure Observations For As-received Samplessupporting

confidence: 65%

“…95-105 HV in ashigh pressure die cast (HPDC) parts [89] and 64-70 HV in as-cast parts [90]. Higher hardness in SLM is also observed in various literatures and is commonly attributed to the finer microstructures attained as the result of significantly higher cooling rates/rapid solidification achieved in SLM due to the short laser-material contact time, thereby preventing recrystallisation or coarsening of the final microstructure [1,41,44,91].…”

Section: Phase Composition and Dislocation Densitymentioning

confidence: 99%

“…AlSi10Mg is a traditional hypoeutectic Al-Si-based cast alloy that is highly attractive for aerospace, marine and automotive applications due to its light weight, high specific strength, good corrosion resistance and low thermal expansion [39][40][41][42]. AlSi10Mg possesses good weldability due to its near Al-Si eutectic composition, in which the size and morphology of eutectic Si significantly influences the overall mechanical properties of this alloy [43,44]. Coarse and acicular-shaped eutectic Si phase often cause cracks in cast AlSi10Mg (cooling rate < 10 2 K s −1 ) when placed under tensile load, resulting in mechanical performance [45].…”

Section: Introductionmentioning

confidence: 99%

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Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion

Yusuf

Hoegden

Gao

2020

Int J Adv Manuf Technol

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For the first time, high-pressure torsion (HPT) was applied to additively manufactured AlSi10Mg built in two directions (vertical and horizontal) by selective laser melting (SLM), and the influence of extreme torsional strain on the porosity, microstructure and microhardness of the alloy was investigated. ImageJ analysis indicates that significant porosity reduction is achieved by 1/4 HPT revolution (low strain). Optical microscopy (OM) and scanning electron microscopy (SEM) observations reveal the steady distortion and elongation of the melt pools, the continuous elongation of the cellular-dendritic Al matrix and breakage of the eutectic Si phase network with increased HPT revolutions. Microhardness measurements indicate that despite the significant increase in hardness attained from HPT processing, hardness saturation and microstructural homogeneity are not achieved even after 10 HPT revolutions. X-ray diffraction (XRD) line broadening analysis demonstrates increased dislocation densities with increased HPT revolutions, which contributes to the considerably higher hardness values compared to as-received samples.

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“…In the Side section, the microstructure is mainly composed of elongated grains which growth towards the center of the melt pool. While in the Top section, only equiaxed grains can be seen [30].…”

Section: Microstructurementioning

confidence: 99%

Research on metallurgical bonding of selective laser melted AlSi10Mg alloy

Dong

Zhang

et al. 2020

Mater. Res. Express

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The densification behavior, surface morphology and attendant microstructural characteristics of the selective laser melting (SLM) processed AlSi10Mg alloy affected by the processing parameters were systematically investigated. Increasing the laser scanning speed or hatch spacing will deteriorate the metallurgical bonding between melt pools, resulting in the increase of irregular pores. Scanning speed and hatch spacing affect the liquid metallurgical bonding of melt pools in different ways. By manipulating scanning speed, the shape of the melt pool changes, resulting in different extents of metallurgical bonding. Whereas hatch spacing influences the resultant metallurgical bonding by controlling the overlapping rate between neighboring scan tracks simply. The formations of the hierarchical microstructures which discriminated by the Si phase are elucidated. Coarse zones are formed by the instantaneous existence of extremely high ratio of thermal gradient (G) and solidification rate (R) at the melt pool boundary, where solidification microstructure grows planar. Fine zones are formed by columnar-dendritic growth of microstructure. During the solidification process, the contraction forces that generated by the trapped gas in the pores and gravity are applied to the liquid around irregular pores and, forms the porous microstructures different from that in dense areas eventually. The tensile tests reveal that the tensile properties of SLM-processed samples are significantly affected by the formation of porosity.

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Microstructure of selective laser melted AlSi10Mg alloy

Cited by 298 publications

References 41 publications

Evaluation on the fatigue behavior of sand-blasted AlSi10Mg obtained by DMLS

Evaluation on the fatigue behavior of sand-blasted AlSi10Mg obtained by DMLS

Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion

Research on metallurgical bonding of selective laser melted AlSi10Mg alloy

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