A high-strength heat-resistant Al−5.7Ni eutectic alloy with spherical Al3Ni nano-particles by selective laser melting. (October 2021)

• Record Type: Journal Article
• Authors: Deng, Junwang; Chen, Chao; Liu, Xiaochun; Li, Yunping; Zhou, Kechao; Guo, Shengmin
• Is Part Of: Scripta materialia. Number 203(2021)
• Publication Date: 2021-10
• Subjects: Al−Ni alloy -- Eutectic alloy -- Additive manufacturing -- selective laser melting; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2021.114034
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Traditional high-strength wrought aluminum alloys are sensitive to cracks in additive manufacturing (AM) while the eutectic aluminum alloys can be reliably printed. To explore a high-strength heat-resistant aluminum alloys by AM, in this paper, we proposed to retard the solidification range by using an Al−5.7Ni alloy, thus alleviate crack formation tendency. The AM parts of this alloy was featured by uniformly distributed spherical Al3 Ni nano-particles with an average size of ~33 nm, showing a novel coherent crystallographic relationship with the matrix, <110>Al //<113>Al3Ni and {111}Al //{211}Al3Ni . Excellent mechanical property was achieved in this crack-free alloy with tensile strength of 410 MPa at room temperature and 140 MPa at 300°C, mainly attributed to the dispersion strengthening from the Al3 Ni nano-particles with superior thermal stability. Graphical abstract: Image, graphical abstract