Excellent specific strength-ductility synergy in novel complex concentrated alloy after suction casting
Artikel i vetenskaplig tidskrift, 2024

Lightweight alloys are known to improve the fuel efficiency of the structural components due to high strength-to-weight ratio, however, they lack formability at room temperature. This major limitation of poor formability is most of the time overcome by post-fabrication processing and treatments thereby increasing their cost exponentially. We present a novel Ti50V16Zr16Nb10Al5Mo3 (all in at. %) complex concentrated alloy (Ti-CCA) designed based on the combination of valence electron concentration theory and the high entropy approach. The optimal selection of constituent elements has led to a density of 5.63 gm/cc for Ti-CCA after suction casting (SC). SC Ti-CCA displayed exceptional room temperature strength (UTS ∼ 1.25 GPa) and ductility (ε ∼ 35 %) with a yield strength (YS) of ∼ 1.1 GPa (Specific YS = 191 MPa/gm/cc) without any post-processing treatments. The exceptional YS in Ti-CCA is attributed to hetero grain size microstructure, whereas enormous strength-ductility synergy is due to the concurrent occurrence of slip and deformation band formation in the early stages of deformation followed by prolonged necking event due to delayed void nucleation and growth. The proposed philosophy of Ti-CCA design overcomes the conventional notion of strength-ductility trade-off in such alloy systems by retaining their inherent characteristics.

Void formation

Valence electron concentration

Deformation bands

Strength-ductility synergy

Suction casting

Complex concentrated alloy

Specific strength


A. R. Balpande

Indian Institute of Technology

S. Agrawal

Indian Institute of Science

Xiaolong Li

Chalmers, Industri- och materialvetenskap, Material och tillverkning

S. Suwas

Indian Institute of Science

Sheng Guo

Chalmers, Industri- och materialvetenskap, Material och tillverkning

P. Ghosal

Defence Metallurgical Research Lab India

S. S. Nene

Indian Institute of Technology

Materials and Design

0264-1275 (ISSN) 1873-4197 (eISSN)

Vol. 242 112988


Annan materialteknik

Metallurgi och metalliska material



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