In Situ Mo(Si,Al)2-Based Composite through Selective Laser Melting of a MoSi2-30 wt.% AlSi10Mg Mixture.

Tatevik Minasyan,Sofiya Aydinyan,Ehsan Toyserkani,Irina Hussainova

doi:10.3390/ma13173720

Tatevik Minasyan, Sofiya Aydinyan + Show 2 more

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https://doi.org/10.3390/ma13173720

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Abstract

The laser power bed fusion approach has been successfully employed to manufacture Mo(Si,Al)2-based composites through the selective laser melting of a MoSi2-30 wt.% AlSi10Mg mixture for high-temperature structural applications. Composites were manufactured by leveraging the in situ reaction of the components during printing at 150–300 W laser power, 500–1000 mm·s−1 laser scanning speed, and 100–134 J·mm−3 volumetric energy density. Microcomputed tomography scans indicated a negligible induced porosity throughout the specimens. The fully dense Mo(Si1-x,Alx)2-based composites, with hardness exceeding 545 HV1 and low roughness for both the top (horizontal) and side (vertical) surfaces, demonstrated that laser-based additive manufacturing can be exploited to create unique structures containing hexagonal Mo(Si0.67Al0.33)2.

Highlights

Molybdenum disilicide MoSi2 is regarded as a promising material for a wide variety of industrial applications due to its combination of outstanding properties, such as its high melting point (2293 K), moderate density (6.24 g·cm−3 ), excellent intermediate- and high-temperature oxidation resistance, and metallic-like high electrical and thermal conductivity [1]
We demonstrate for the first time the reactive selective laser melting of MoSi2 -30 wt.% AlSi10Mg, which results in fully dense bulks of good quality
Sphericity is determined as the square of the circularity of a powder particle using the

Summary

Introduction

Molybdenum disilicide MoSi2 is regarded as a promising material for a wide variety of industrial applications due to its combination of outstanding properties, such as its high melting point (2293 K), moderate density (6.24 g·cm−3 ), excellent intermediate- and high-temperature oxidation resistance, and metallic-like high electrical and thermal conductivity [1]. Exploitation of these properties opens up the prospect for the development of composites with tailored mechanical and physical behaviours.

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