Multimodal and multiscale strengthening mechanisms in Al-Ni-Zr-Ti-Mn alloy processed by laser powder bed fusion additive manufacturing

Abhijeet Dhal; Saket Thapliyal; Priyanka Agrawal; Ankita Roy; Aishani Sharma; Rajiv S. Mishra; Eric Faierson

doi:10.1016/j.matdes.2023.112602

Multimodal and multiscale strengthening mechanisms in Al-Ni-Zr-Ti-Mn alloy processed by laser powder bed fusion additive manufacturing

Abhijeet Dhal, Saket Thapliyal, Priyanka Agrawal, Ankita Roy, Aishani Sharma, Rajiv S. Mishra, Eric Faierson

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

The unique thermokinetics of laser-powder bed fusion additive manufacturing (L-PBFAM) has been exploited for development of a novel high-strength Al-Ni-Ti-Zr-Mn alloy. The addition of 0.5 wt% Mn leads to extraordinary improvement in ultimate tensile strength (502 MPa) and work hardening due to the activation of two Mn-induced strengthening mechanisms. First, by a bimodal particle strengthening effect due to Al₃₁Mn₆Ni₁₂ nano-quasi-crystal particles rejected in inter-dendritic spaces and fibrous Al₃Ni eutectic dendritic channels, which predominately contributes to the strength improvement, and second by solid solution strengthening from remaining Mn entrapped in Al. These mechanisms supplement the particle strengthening effect imparted by coherent and incoherent Al₃(Ti,Zr) co-precipitates present at melt pool boundaries, dislocation strengthening due to solidification induced strain, and Hall-Petch and backstress strengthening effect due to heterogenous grain size distribution occurring at various length scales. The solidification dynamics and hierarchical heat distribution that are associated with L-PBFAM resulted in complex spatial variations in these strengthening phenomena and were investigated via a high-throughput multiscale structure–property correlation that involved thermokinetic simulation, X-ray diffraction, high-resolution nanoindentation mapping, and site-specific transmission electron microscopy of the alloy.

Original language	English
Article number	112602
Journal	Materials and Design
Volume	237
DOIs	https://doi.org/10.1016/j.matdes.2023.112602
State	Published - Jan 2024
Externally published	Yes

Funding

This work was supported by the DEVCOM Army Research Laboratory under Cooperative Agreement # W911NF-18-2-0067 . The authors acknowledge Materials Research Facility and Advanced Materials and Manufacturing Processes Institute at University of North Texas for access to electron microscopes and tomographic X-ray microscope, respectively. This work was supported by the DEVCOM Army Research Laboratory under Cooperative Agreement #W911NF-18-2-0067. The authors acknowledge Materials Research Facility and Advanced Materials and Manufacturing Processes Institute at University of North Texas for access to electron microscopes and tomographic X-ray microscope, respectively.

Funders	Funder number
Materials Research Facility and Advanced Materials and Manufacturing Processes Institute
DEVCOM Army Research Laboratory	W911NF-18-2-0067

Keywords

Aluminum alloy
Indentation size effect
Laser-powder bed fusion additive manufacturing
Nanoindentation
Strengthening mechanism

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.matdes.2023.112602

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title = "Multimodal and multiscale strengthening mechanisms in Al-Ni-Zr-Ti-Mn alloy processed by laser powder bed fusion additive manufacturing",

abstract = "The unique thermokinetics of laser-powder bed fusion additive manufacturing (L-PBFAM) has been exploited for development of a novel high-strength Al-Ni-Ti-Zr-Mn alloy. The addition of 0.5 wt% Mn leads to extraordinary improvement in ultimate tensile strength (502 MPa) and work hardening due to the activation of two Mn-induced strengthening mechanisms. First, by a bimodal particle strengthening effect due to Al31Mn6Ni12 nano-quasi-crystal particles rejected in inter-dendritic spaces and fibrous Al3Ni eutectic dendritic channels, which predominately contributes to the strength improvement, and second by solid solution strengthening from remaining Mn entrapped in Al. These mechanisms supplement the particle strengthening effect imparted by coherent and incoherent Al3(Ti,Zr) co-precipitates present at melt pool boundaries, dislocation strengthening due to solidification induced strain, and Hall-Petch and backstress strengthening effect due to heterogenous grain size distribution occurring at various length scales. The solidification dynamics and hierarchical heat distribution that are associated with L-PBFAM resulted in complex spatial variations in these strengthening phenomena and were investigated via a high-throughput multiscale structure–property correlation that involved thermokinetic simulation, X-ray diffraction, high-resolution nanoindentation mapping, and site-specific transmission electron microscopy of the alloy.",

keywords = "Aluminum alloy, Indentation size effect, Laser-powder bed fusion additive manufacturing, Nanoindentation, Strengthening mechanism",

author = "Abhijeet Dhal and Saket Thapliyal and Priyanka Agrawal and Ankita Roy and Aishani Sharma and Mishra, {Rajiv S.} and Eric Faierson",

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AU - Dhal, Abhijeet

AU - Thapliyal, Saket

AU - Agrawal, Priyanka

AU - Roy, Ankita

AU - Sharma, Aishani

AU - Mishra, Rajiv S.

AU - Faierson, Eric

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N2 - The unique thermokinetics of laser-powder bed fusion additive manufacturing (L-PBFAM) has been exploited for development of a novel high-strength Al-Ni-Ti-Zr-Mn alloy. The addition of 0.5 wt% Mn leads to extraordinary improvement in ultimate tensile strength (502 MPa) and work hardening due to the activation of two Mn-induced strengthening mechanisms. First, by a bimodal particle strengthening effect due to Al31Mn6Ni12 nano-quasi-crystal particles rejected in inter-dendritic spaces and fibrous Al3Ni eutectic dendritic channels, which predominately contributes to the strength improvement, and second by solid solution strengthening from remaining Mn entrapped in Al. These mechanisms supplement the particle strengthening effect imparted by coherent and incoherent Al3(Ti,Zr) co-precipitates present at melt pool boundaries, dislocation strengthening due to solidification induced strain, and Hall-Petch and backstress strengthening effect due to heterogenous grain size distribution occurring at various length scales. The solidification dynamics and hierarchical heat distribution that are associated with L-PBFAM resulted in complex spatial variations in these strengthening phenomena and were investigated via a high-throughput multiscale structure–property correlation that involved thermokinetic simulation, X-ray diffraction, high-resolution nanoindentation mapping, and site-specific transmission electron microscopy of the alloy.

AB - The unique thermokinetics of laser-powder bed fusion additive manufacturing (L-PBFAM) has been exploited for development of a novel high-strength Al-Ni-Ti-Zr-Mn alloy. The addition of 0.5 wt% Mn leads to extraordinary improvement in ultimate tensile strength (502 MPa) and work hardening due to the activation of two Mn-induced strengthening mechanisms. First, by a bimodal particle strengthening effect due to Al31Mn6Ni12 nano-quasi-crystal particles rejected in inter-dendritic spaces and fibrous Al3Ni eutectic dendritic channels, which predominately contributes to the strength improvement, and second by solid solution strengthening from remaining Mn entrapped in Al. These mechanisms supplement the particle strengthening effect imparted by coherent and incoherent Al3(Ti,Zr) co-precipitates present at melt pool boundaries, dislocation strengthening due to solidification induced strain, and Hall-Petch and backstress strengthening effect due to heterogenous grain size distribution occurring at various length scales. The solidification dynamics and hierarchical heat distribution that are associated with L-PBFAM resulted in complex spatial variations in these strengthening phenomena and were investigated via a high-throughput multiscale structure–property correlation that involved thermokinetic simulation, X-ray diffraction, high-resolution nanoindentation mapping, and site-specific transmission electron microscopy of the alloy.

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KW - Indentation size effect

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KW - Nanoindentation

KW - Strengthening mechanism

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Multimodal and multiscale strengthening mechanisms in Al-Ni-Zr-Ti-Mn alloy processed by laser powder bed fusion additive manufacturing

Abstract

Funding

Keywords

UN SDGs

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