3D printing of crack-free high strength Zr-based bulk metallic glass composite by selective laser melting

Additive Manufacturing of Advanced Multi‐Component Alloys: Bulk Metallic Glasses and High Entropy Alloys

“…All of these changes were attributed to the phase formation and microstructure at different processing conditions. [108] Interestingly, the fractural angle of the SLMed BMGs was around 90 , totally different from the conventional cast Zr-based BMGs which had a fractural angle around 42 . [84] However, in this study, Zr-based BMG showed very little ductility or no ductility at all.…”

“…It is noteworthy that by applying multiple scan strategy, the microhardness of the fabricated Zr-based BMGs was also homogenized as a result of the homogenization of the constituent elements in the Zr- www.advancedsciencenews.com www.aem-journal.com based BMG, especially at higher scan speeds. [108] In addition, they also observed both vein-like patterns and smooth fractural features in the fracture surfaces of the SLMed Zr-based BMGs. [84] In a similar study conducted by Ouyang et al, the fabricated Zr-based BMG composites samples using SLM also showed a similar strength to their counterparts fabricated by cast and again only little ductility was observed ( Figure 10).…”

“…[84] At the lowest scan speed, the strength decreased upon multiple scans. [108] It was also reported that the SLMed Zr-based BMG composites showed a low Young's modulus, which was mainly attributed to the defects in the SLMed BMG samples. It is noteworthy that by applying multiple scan strategy, the microhardness of the fabricated Zr-based BMGs was also homogenized as a result of the homogenization of the constituent elements in the Zr- www.advancedsciencenews.com www.aem-journal.com based BMG, especially at higher scan speeds.…”

“…[83,104,108] Li et al first reported that using a www.advancedsciencenews.com www.aem-journal.com low-energy-density re-scan strategy can stop the macro-crack propagation in an Al-based BMG composite during SLM ( Figure 2). [83,104,108] Li et al first reported that using a www.advancedsciencenews.com www.aem-journal.com low-energy-density re-scan strategy can stop the macro-crack propagation in an Al-based BMG composite during SLM ( Figure 2).…”

“…[104] The underlying reasons for this have been attributed to: the formation of superplasticity during rescanning, where the initial residual stress is rapidly relieved through viscous flow; and the reduction of thermal stress after rescanning due to lowered temperature gradient (and therefore cooling rate). [108] The successful fabrication of crackfree Zr-based BMG specimens was mainly attributed to a low thermal stress generated in the SLM process while the high toughness of Zr-based BMG may also play a role in suppression of micro-crack formation. As a result, a crack-free Al-based BMG composite sample gear with a diameter around 25 mm and height around 10 mm was produced.…”