Abstract
A novel lightweight Al-Ti-Cr-Mn-V medium-entropy alloy (MEA) system was developed using a nonequiatiomic approach and alloys were produced through arc melting and drop casting. These alloys comprised a body-centered cubic (BCC) and face-centered cubic (FCC) dual phase with a density of approximately 4.5 g/cm3. However, the fraction of the BCC phase and morphology of the FCC phase can be controlled by incorporating other elements. The results of compression tests indicated that these Al-Ti-Cr-Mn-V alloys exhibited a prominent compression strength (~1940 MPa) and ductility (~30%). Moreover, homogenized samples maintained a high compression strength of 1900 MPa and similar ductility (30%). Due to the high specific compressive strength (0.433 GPa·g/cm3) and excellent combination of strength and ductility, the cast lightweight Al-Ti-Cr-Mn-V MEAs are a promising alloy system for application in transportation and energy industries.
Highlights
High-entropy alloys (HEAs), known as multiprincipal element alloys, have received considerable attention from the scientific community because of the high mixing entropy of alloying elements
Some of the equiatomic Lightweight HEAs (LWHEAs) composed of light elements such as Al and Ti have been investigated recently [3]
The literature has reported that some medium-entropy alloys (MEAs) composed of ternary and quaternary alloys exhibited a single phase and demonstrated more promising mechanical properties compared with HEAs [13,14,15,16]
Summary
High-entropy alloys (HEAs), known as multiprincipal element alloys, have received considerable attention from the scientific community because of the high mixing entropy of alloying elements These new-class alloys exhibit unique properties such as the high-entropy effect, distorted lattices, sluggish diffusion, and cocktail effect [1,2]. Al and Ti tend to form stable intermetallic compounds with many other elements due to their highly negative values of heat of mixing These brittle intermetallic phases exert detrimental effects on the mechanical properties of these LWHEAs [4,5]. The literature has reported that some medium-entropy alloys (MEAs) composed of ternary and quaternary alloys exhibited a single phase and demonstrated more promising mechanical properties compared with HEAs [13,14,15,16]. One alloy composition with a more favorable mechanical performance among the quaternary Al-Ti-Cr-Mn alloys was further modified by adding V to enhance its mechanical properties and phase stability at a high temperature [17]
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