Abstract
To explore a novel high strength and low modulus ultralight-weight complex concentrated alloys (ULW-CCAs), a series of light alloys are designed and explored based on some low-density and low modulus elements, such as Al, Li, Mg, Ca, Si, and Y. An Al19.9Li30Mg35Si10Ca5Y0.1 (at %) CCA with a high specific strength of 327 KPa·m−3 is successfully developed. After adjusting the composition, the Al15Li35Mg48Ca1Si1 CCA with the good compressive plasticity is successfully developed. The Al15Li38Mg45Ca0.5Si1.5 and Al15Li39Mg45Ca0.5Si0.5 CCAs exhibit good plasticity of >45%, and >60%, respectively. These ULW-CCAs show the high specific strength, good ductility, and low Young’s modulus, as compared with the previously reported CCAs.
Highlights
Lightweight is of importance for developing advanced alloys used in aircraft, military, and electronic industry, etc. [1]
The Al15Li35Mg35Ca10Si5 ULW-concentrated alloys (CCAs) consists of four phases, i.e., a body-centered cubic this ULW-CCA
The Al15 Li35 Mg35 Ca10 Si5 ULW-CCA consists of four phases, i.e., a body-centered cubic (BCC) solid solution, an hexagonal close-packed (HCP) solid solution, Al2Ca and CaMgSi intermetallics (Figure 2b)
Summary
Lightweight is of importance for developing advanced alloys used in aircraft, military, and electronic industry, etc. [1]. The light-weight alloys, based on Al, Mg, and Ti, usually have low density and high strength, which are attractive in the structural materials field [2]. Traditional light-weight alloys are usually based on one dominant element, which limits the exploration of new light-weight alloys. High-entropy alloys (HEAs) [3] or complex concentrated alloys (CCAs) [4,5] are a new emerging class of potentially structural materials [6], which contain multi-principle elements [5]. The developed CCAs have attracted increased attention because of their unique compositions, microstructures, and outstanding properties, such as ultrahigh fracture toughness [8], high strength [9,10,11], good resistances for fatigue, corrosion, and oxidation [12,13,14,15]
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