3D printing of Fe-based bulk metallic glass composites with combined high strength and fracture toughness

3D printing of Fe-based bulk metallic glass composites with combined high strength and fracture... Additive manufacturing is a promising technique for the production of bulk metallic glass (BMG) components without size limitations. However, the current additive manufacturing technique encounters the challenge of micro-cracking induced by huge thermal stress during the process, which significantly degrades the mechanical performance of the components. Based on systematic experiments combined with finite element simulation, we revealed that micro-cracks in inherently brittle Fe-based metallic glass during selective laser melting (SLM) are triggered by highly concentrated thermal stress around micro-pores, which is difficult to avoid during SLM even by careful process optimization. To suppress these micro-cracks, Cu and Cu-Ni alloys with high toughness as second phases were introduced to form BMG composites. The results revealed that the generation of high-density dislocations in second phases during SLM drastically reduce thermal stress by releasing strain energy and thus suppress micro-crack formation. Further investigation has shown that the introduction the second phase improves the fracture toughness of Fe-based BMGs to 47MPam1/2, which is approximately 20 times higher than that of the Fe-based BMG (2.2MPam1/2). Our findings provide general guidelines for the SLM fabrication of bulk metallic glass composites with tunable mechanical performances, as well as large sizes and freeform geometries. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Materials & design Elsevier

3D printing of Fe-based bulk metallic glass composites with combined high strength and fracture toughness

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0264-1275
eISSN
0141-5530
D.O.I.
10.1016/j.matdes.2018.01.061
Publisher site
See Article on Publisher Site

Abstract

Additive manufacturing is a promising technique for the production of bulk metallic glass (BMG) components without size limitations. However, the current additive manufacturing technique encounters the challenge of micro-cracking induced by huge thermal stress during the process, which significantly degrades the mechanical performance of the components. Based on systematic experiments combined with finite element simulation, we revealed that micro-cracks in inherently brittle Fe-based metallic glass during selective laser melting (SLM) are triggered by highly concentrated thermal stress around micro-pores, which is difficult to avoid during SLM even by careful process optimization. To suppress these micro-cracks, Cu and Cu-Ni alloys with high toughness as second phases were introduced to form BMG composites. The results revealed that the generation of high-density dislocations in second phases during SLM drastically reduce thermal stress by releasing strain energy and thus suppress micro-crack formation. Further investigation has shown that the introduction the second phase improves the fracture toughness of Fe-based BMGs to 47MPam1/2, which is approximately 20 times higher than that of the Fe-based BMG (2.2MPam1/2). Our findings provide general guidelines for the SLM fabrication of bulk metallic glass composites with tunable mechanical performances, as well as large sizes and freeform geometries.

Journal

Materials & designElsevier

Published: Apr 5, 2018

References

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