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

Materials & Design (Jan 2024)

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

Affiliations

Abhijeet Dhal: Department of Materials Science and Engineering, University of North Texas, Denton, TX 76201, USA; Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76201, USA
Saket Thapliyal: Department of Materials Science and Engineering, University of North Texas, Denton, TX 76201, USA; Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76201, USA
Priyanka Agrawal: Department of Materials Science and Engineering, University of North Texas, Denton, TX 76201, USA; Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76201, USA
Ankita Roy: Department of Materials Science and Engineering, University of North Texas, Denton, TX 76201, USA; Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76201, USA
Aishani Sharma: Department of Materials Science and Engineering, University of North Texas, Denton, TX 76201, USA; Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76201, USA
Rajiv S. Mishra: Department of Materials Science and Engineering, University of North Texas, Denton, TX 76201, USA; Advanced Materials and Manufacturing Processes Institute, University of North Texas, Denton, TX 76201, USA; Corresponding author at: Department of Materials Science and Engineering, University of North Texas, Denton, Texas 76201, USA.
Eric Faierson: Quad City Manufacturing Laboratory, Rock Island, IL 61201, USA

Journal volume & issue: Vol. 237
p. 112602

Abstract

Read online

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.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

About the journal

Abstract

Keywords