Effect of Powder Particle Shape on the Properties of In Situ Ti–TiB Composite Materials Produced by Selective Laser Melting

Attar, Hooyar; Prashanth, Konda Gokuldoss; Zhang, Lai-Chang; Calin, Mariana; Okulov, Ilya; Scudino, Sergio; Chao, Yang; Eckert, J.

doi:10.1016/j.jmst.2015.08.007

Cited by 212 publications

(65 citation statements)

References 32 publications

(36 reference statements)

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“…The milling was carried out for 2 h with hardened steel balls and vials with a rotational speed of 100 rotations per minute (rpm) and a ball to powder ratio of 10:1. Such gentle milling conditions are used in the present study unlike 39 in order have gentle mixing between the matrix and the reinforcement and to avoid any possible deformation of the powder. Bulk specimens (4 mm diameter, 20 mm height) of both unreinforced Al-12Si matrix and TNMC were produced by SLM at room temperature using a SLM 250 HL device (from SLM Solutions, Lübeck, Germany) equipped with an Yb-YAG laser.…”

Section: Methodsmentioning

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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Section: Methodsmentioning

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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“…The lower densification levels achieved in this study may also be attributed to the irregular shape of magnesium particles used as it affects the flowability of the powder layers. As was postulated by Attar et al [79] in SLM processing of Ti-TiB composite powders, usage of non-spherical shaped powder particles negatively influences the uniform deposition of powders, as powders with irregular shape may not flow easily and tend to interlock mechanically and entangle with each other, causing an obstruction in powder flow, consequently leading to the formation of porosities. It is also worth noting that, though SLM is normally processed based on the complete melting mechanism, application of lower laser energy densities can lead to partial melting of the metal powder surface [80].…”

Section: Effects Of Laser Processing Parameters On the Processing Andmentioning

confidence: 98%

“…The quality of powder also determines physical variables, such as flowability (how well a powder flows) and apparent density (how well a powder packs) [86]. Powder morphology is one important factor in SLM affecting the processing conditions such as flowability, packing of the powders, and nature of heat transfer as well as being a crucial factor in defining the layer thickness and surface roughness during the SLM process [79]. High build rates and part accuracy can be achieved in SLM by employing spherical particles rather than irregular particles as they contribute towards improved flowability of the powders [87].…”

Section: Effects Of Powder Properties On the Slm Densification Mechanismmentioning

confidence: 99%

Selective Laser Melting of Magnesium and Magnesium Alloy Powders: A Review

Manakari

Parande

Gupta

2016

Metals

179

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Magnesium-based materials are used primarily in developing lightweight structures owing to their lower density. Further, being biocompatible they offer potential for use as bioresorbable materials for degradable bone replacement implants. The design and manufacture of complex shaped components made of magnesium with good quality are in high demand in the automotive, aerospace, and biomedical areas. Selective laser melting (SLM) is becoming a powerful additive manufacturing technology, enabling the manufacture of customized, complex metallic designs. This article reviews the recent progress in the SLM of magnesium based materials. Effects of SLM process parameters and powder properties on the processing and densification of the magnesium alloys are discussed in detail. The microstructure and metallurgical defects encountered in the SLM processed parts are described. Applications of SLM for potential biomedical applications in magnesium alloys are also addressed. Finally, the paper summarizes the findings from this review together with some proposed future challenges for advancing the knowledge in the SLM processing of magnesium alloy powders.

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“…Selective laser melting (SLM) is one of the additive manufacturing (AM) processes that can fabricate 3D metal parts layer‐by‐layer with improved functionalities and of theoretically any shape . One of the most extensively fabricated materials is Al‐12Si, because it is a casting alloy with good flowability thereby making it easier to fabricate by the SLM process.…”

Section: Introductionmentioning

confidence: 99%

Work hardening in selective laser melted Al‐12Si alloy

Gokuldoss

2019

Mat Design Process Comm

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Selective laser melting (SLM) is one of the additive manufacturing processes that has been extensively studied, due to its potential to fabricate materials with improved functionalities and properties. Al‐12Si is one of the casting alloy that has been extensively studied using SLM. It has been found that the SLM processed Al‐12Si is very brittle but rather tough. The present letter is focused to investigate the strain hardening behavior and its exponent on the SLM processed Al‐12Si alloy. The present study is a preliminary example to evaluate a possible correlation between strain hardening rate, strain hardening exponent, and to the ductility and toughness.

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Effect of Powder Particle Shape on the Properties of In Situ Ti–TiB Composite Materials Produced by Selective Laser Melting

Cited by 212 publications

References 32 publications

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

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

Selective Laser Melting of Magnesium and Magnesium Alloy Powders: A Review

Work hardening in selective laser melted Al‐12Si alloy

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