A selective laser melting and solution heat treatment refined Al–12Si alloy with a controllable ultrafine eutectic microstructure and 25% tensile ductility

Li, Xiao Peng; Wang, Xiaojun; Saunders, Martin; Suvorova, Alexandra; Zhang, Lai-Chang; Liu, Yujing; Fang, Minghao; Huang, Zhaohui; Sercombe, T.B.

doi:10.1016/j.actamat.2015.05.017

Cited by 539 publications

(170 citation statements)

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“…• Al-Si alloys: Due to their attractive combination of low weight, high heat conductivity and mechanical properties, Al-Si alloys (AlSi10Mg [151][152][153][154][155][156][157] and Al-12Si [158,159]) have wide applications in aerospace, automotive industries as heat exchangers. AlSi10Mg and Al-12Si are hypoeutectic alloys whose mechanical properties are largely dependant on the morphology of eutectic silicon.…”

Section: Materials Manufactured With Slmmentioning

confidence: 99%

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Deng

2018

Linköping Studies in Science and Technology. Licentiate Thesis

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Linköping 2018Cover image: A fracture surface of EBM IN718 after tensile test at room temperature.During the course of research underlying this thesis, Dunyong Deng was enrolled in Agora Materiae, a multidiciplinary doctoral program at Linköping University, Sweden. Printed by LiU-Tryck 2018 © Dunyong Deng AbstractAdditive manufacturing (AM), also known as 3D printing, has gained significant interest in aerospace, energy, automotive and medical industries due to its capabilities of manufacturing components that are either prohibitively costly or impossible to manufacture by conventional processes. Among the various additive manufacturing processes for metallic components, electron beam melting (EBM) and selective laser melting (SLM) are two of the most widely used powder bed based processes, and have shown great potential for manufacturing high-end critical components, such as turbine blades and customized medical implants. The futures of the EBM and SLM are doubtlessly promising, but to fully realize their potentials there are still many challenges to overcome.Inconel 718 (IN718) is a nickel-base superalloy and has impressive combination of good mechanical properties and low cost. Though IN718 is being mostly used as a turbine disk material now, the initial introduction of IN718 was to overcome the poor weldability of superalloys in 1960s, since sluggish precipitation of strengthening phases γ ′ /γ ′′ enables good resistance to strain-age cracking during welding or post weld heat treatment. Given the similarity between AM and welding processes, IN718 has been widely applied to the metallic AM field to facilitate the understandings of process-microstructure-property relationships.The work presented in this licentiate thesis aims to better understand microstructures and mechanical properties EBM and SLM IN718, which have not been systematically investigated. Microstructures of EBM and SLM IN718 have been characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and correlated with the process conditions. Monotonic mechanical properties (e.g., Vickers microhardness and tensile properties) have also been measured and rationalized with regards to the microstructure evolutions before and after heat treatments.For EBM IN718, the results show the microstructure is not homogeneous but dependant on the location in the components, and the anisotropic mechanical properties are probably attributed to alignment of porosities rather than texture.iii Post heat treatment can slightly increase the mechanical strength compared to the as-manufactured condition but does not alter the anisotropy. SLM IN718 shows significantly different microstructure and mechanical properties to EBM IN718. The as-manufactured SLM IN718 has very fine dendritic microstructure and Laves phases in the interdendrites, and is "work-hardened" by the residual strains and dislocations present in the material. Mechanical properties are different between horizontally and vertically built samples, and heat treatment can m...

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Section: Materials Manufactured With Slmmentioning

confidence: 99%

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Deng

2018

Linköping Studies in Science and Technology. Licentiate Thesis

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“…[46][47][48] On the other hand, the microstructure of the TNMC is completely different. Figures 2 (d)-2(f) suggest that the reinforcement is distributed in the form of irregularly shaped dendrites and particles, with an average width of 482 6 68 nm and 1.75 6 0.32 lm length.…”

Section: A Structural and Microstructural Analysismentioning

confidence: 99%

Processing of Al–12Si–TNM composites by selective laser melting and evaluation of compressive and wear properties

et al. 2015

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Al-12Si (80 vol%)-Ti 52.4 Al 42.2 Nb 4.4 Mo 0.9 B 0.06 (at.%) (TNM) composites were successfully produced by the selective laser melting (SLM). Detailed structural and microstructural analysis shows the formation of the Al 6 MoTi intermetallic phase due to the reaction of the TNM reinforcement with the Al-12Si matrix during SLM. Compression tests reveal that the composites exhibit significantly improved properties (;140 and ;160 MPa higher yield and ultimate compressive strengths, respectively) compared with the Al-12Si matrix. However, the samples break at ;6% total strain under compression, thus showing a reduced plasticity of the composites. Sliding wear tests were carried out for both the Al-12Si matrix and the Al-12Si-TNM composites. The composites perform better under sliding wear conditions and the wear rate increases with increasing loads. At high loads, the wear takes place at three different rates and the wear rate decreases with increasing experiment duration.

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“…The resulting Al-based composite powders exhibited a fine grain structure, with uniformly dispersed TiB 2 nanoparticles, and thereby are promising candidates for nanocomposite synthesis. Since one of the major challenges in the laser-based additive manufacturing (AM) field (e.g., selective laser melting) is the severe limitation of powder materials with acceptable laser processability [11][12][13], the introduction of pre-embedded nanometer-sized TiB 2 into the metal matrix (e.g., Al-Cu-Mg in this study) would help to expand the powder materials' palette for AM due to the higher laser absorptivity of TiB 2 compared to the Al matrix [14]. Furthermore, since the nanometer-sized TiB 2 particles are embedded into spherical, micrometer-sized composite powders obtained by gas atomization, the powder flowability is not jeopardized.…”

Section: Introductionmentioning

confidence: 99%

Novel Composite Powders with Uniform TiB2 Nano-Particle Distribution for 3D Printing

Chen

et al. 2017

Applied Sciences

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Abstract:It is reported that the ductility and strength of a metal matrix composite could be concurrently improved if the reinforcing particles were of the size of nanometers and distributed uniformly. In this paper, we revealed that gas atomization solidification could effectively disperse TiB 2 nanoparticles in the Al alloy matrix due to its fast cooling rate and the coherent orientation relationship between TiB 2 particles and α-Al. Besides, nano-TiB 2 led to refined equiaxed grain structures. Furthermore, the composite powders with uniformly embedded nano-TiB 2 showed improved laser absorptivity. The novel composite powders are well suited for selective laser melting.

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A selective laser melting and solution heat treatment refined Al–12Si alloy with a controllable ultrafine eutectic microstructure and 25% tensile ductility

Cited by 539 publications

References 50 publications

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Processing of Al–12Si–TNM composites by selective laser melting and evaluation of compressive and wear properties

Novel Composite Powders with Uniform TiB2 Nano-Particle Distribution for 3D Printing

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