Additive manufacturing of refractory multi-principal element alloy with ultrahigh-temperature strength via simultaneous enhancements in printability and solid solution hardening

Page view(s)
4
Checked on Dec 23, 2024
Additive manufacturing of refractory multi-principal element alloy with ultrahigh-temperature strength via simultaneous enhancements in printability and solid solution hardening
Title:
Additive manufacturing of refractory multi-principal element alloy with ultrahigh-temperature strength via simultaneous enhancements in printability and solid solution hardening
Journal Title:
Additive Manufacturing
Keywords:
Publication Date:
09 August 2024
Citation:
Duan, R., Zhao, Y., Xu, J., Zhou, Q., Yan, Z., Xie, Y., Dong, P., Feng, K., Li, Z., Xu, B., Liang, X., & Ramamurty, U. (2024). Additive manufacturing of refractory multi-principal element alloy with ultrahigh-temperature strength via simultaneous enhancements in printability and solid solution hardening. Additive Manufacturing, 104340. https://doi.org/10.1016/j.addma.2024.104340
Abstract:
Refractory multi-principal element alloys (RMPEAs), such as those obtained from the Nb-Mo-Ta-W system, are known for remarkable high-temperature strength. However, their brittleness poses a significant challenge in manufacturing engineering components through conventional methods. Alloying with other elements, while mitigating this problem, can compromise the high temperature strength. To this end, a composition optimization strategy within the Nb-Mo-Ta-W alloy system was developed to simultaneously enhance ultrahigh-temperature strength through solid solution hardening (SSH) and printability (through the use of the thermodynamic criteria) for laser powder bed fusion (LPBF). The thermodynamic parameters that enhance printability are lower liquid viscosity (LV) and higher liquid temperature range (LR) for better liquidity in filling pores, lower volumetric change (VC) that minimizes cracking susceptibility, and lower shear to bulk moduli ratio (μ/B) that improves toughness. Analysis shows that a higher LR/VC*LV*(μ/B) leads to better printability. An optimum alloy composition (Nb15Ta10W75) that balances strength and printability was obtained by considering SSH and the thermodynamic criterion and experimentally validated. The effects of chemical composition optimization on printability, microstructure, and temperature-dependent strength were analyzed through thermodynamic calculations, microstructure characterization, and strengthening contribution estimations.
License type:
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Funding Info:
This research / project is supported by the A*STAR - Advanced Models for Additive Manufacturing (AM2)
Grant Reference no. : M22L2b0111
Description:
ISSN:
2214-8604
Files uploaded:

File Size Format Action
duanr-monbtaw.pdf 3.41 MB PDF Request a copy