Glass forming ability, flexural strength, and wear properties of additively manufactured Zr-based bulk metallic glasses produced through laser powder bed fusion

Mechanical Properties of Honeycomb Structured Zr-Based Bulk Metallic Glass Specimens Fabricated by Laser Powder Bed Fusion

“…Due to significant defects after removal from the substrate, the sample size was reduced to two. The results The better performance of the P2 samples can be explained by the smaller amount of oxygen contamination in the laboratory grade material, leading to decreased oxygen embrittlement [14,17]. The sample series C of P2 inheres significant deviation in its strength and relative density ( Figure 6), which is most likely attributed to the local process discontinuities, as described above.…”

“…Furthermore, the layer-wise built strategy and selective melting allow for local cooling rates largely to be decoupled from the actual part dimensions. Initially published by Pauly et al [7], investigating a Fe-based alloy, LPBF of various Zr-, Fe-, Al-, and Ti-based alloys have been reported in recent years [8][9][10][11][12][13][14][15]. One can conclude that adequate parameter selection may lead to sufficient cooling rates and hence amorphous solidification.…”

“…Although elasticity, strength, and hardness are comparable, plasticity in flexural bending-tests is still rarely attained. The observed embrittlement during the LPBF-process might be attributed to stress concentrations located in remaining porosity, elevated oxygen content, or relaxation, but this has not yet been conclusively proven [14,17]. It is reported that plasticity can be improved through geometrical design in cellular or porous structures for conventional manufactured BMGs [18][19][20], making such structures attractive for additive manufactured BMGs, due not only to their superior mechanical properties, but also to their lightweight potential.…”

Towards additively manufacturing excavating tools for future robotic space exploration

“…This work showed that a Zr-based BMG had excellent cutting performance, even though previous work demonstrated this alloy to be brittle when manufactured through powder bed fusion. 34 Depending on the geometry of the excavating tool and the forces on the blade, even brittle materials have been shown to survive cutting the simulant. The work shown here motivates the development of BMG alloys in other systems, like Fe, that have been shown to have hardness over 1000 H V. 37 Lastly, this work has demonstrated the potential of using an excavating tool to interrogate the mechanical properties and morphology of an unknown simulant.…”

“…BMGs were also considered due to the material's superb mechanical properties, hardness, corrosion resistance, and self-sharpening ability. [30][31][32][33] Due to the difficulties with printing these alloys in large dimensions and still maintaining the amorphous structure, [34][35][36] 80 mm diameter blades were printed from AMZ4 metallic glass (a ZrCuAlNb alloy) (Heraeus Additive Manufacturing, GmbH), as shown in Figure 2C. The AMZ4 BMG blade was represents the first ever structural BMG part that was printed and tested.…”