Designing novel lightweight, high-strength and high-plasticity Tix(AlCrNb)100-x medium-entropy alloys
Journal
Intermetallics
Journal Volume
117
Start Page
106673
ISSN
09669795
Date Issued
2020
Author(s)
Liao, Y.C.
Li, T.H.
Tsai, P.H.
Jang, J.S.C.
Hsieh, K.C.
Chen, C.Y.
Huang, J.C.
Lo, Y.C.
Huang, C.W.
Tsao, I.Y.
Abstract
Due to the demand for reduced energy consumption by transportation vehicles, lighter weight high-entropy alloys (with density comparable to that of commercial Ti alloys around 4.5–5 g/cm3) are attracting more attention in terms of alloy design and application as structural materials. In this study, a nonequiatomic quaternary alloy system, Tix(AlCrNb)100-x, was designed through the calculation of phase diagrams. Simulation results reveal that a single body-centered cubic (BCC) phase can be formed and can be stable at temperatures above 950 °C. Accordingly, a series of Tix(AlCrNb)100-x (x = 45–80) alloys containing a BCC structure were prepared through vacuum arc melting and rapid cooling. The designed alloys can exhibit desirable mechanical properties with high compression yield strength about 1500 MPa, high compression fracture strength about 1800 MPa and high compression plasticity more than 30% at room temperature. Moreover, the Ti65 alloy can demonstrate a tensile strength of 1200 MPa with a tensile elongation of 32%, after a homogenization treatment for 24 h. The specific compression and tensile strength can reach 0.36 and 0.24 GPa cm3/g. © 2019
Subjects
CALPHAD
High-entropy alloys
Lightweight alloys
Mechanical properties
Medium-entropy alloys
Single-phase
SDGs
Publisher
Elsevier Ltd
Description
論文編號: 106673
Type
journal article