首页|Improving the glass forming ability and plasticity of ZrCuNiAlTi metallic glass by substituting Zr with Sc
Improving the glass forming ability and plasticity of ZrCuNiAlTi metallic glass by substituting Zr with Sc
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NSTL
Elsevier
? 2022 Elsevier B.V.The present study reports the effect of substituting Zr with Sc on the glass forming ability (GFA) and mechanical properties of ZrCuNiAlTi bulk metallic glass (BMG). Results showed that Zr57-xCu20Ni8Al10Ti5Scx (x = 0, 1, 2, 3, 4 at%) BMGs had the best GFA at x = 2, and the critical size was 10 mm, which correlated well with the GFA indicator (Trg and γ). The large atomic radius of Sc and small Gibbs free energy difference between the supercooled liquid and crystalline solid (ΔGl-c) caused significant atomic size mismatch and inhibited crystallization during cooling, ultimately improving GFA. Compression test results indicated that the plasticity of the Zr55Cu20Ni8Al10Ti5Sc2 BMG increased fivefold (9.1%) relative to that of the Sc-free case, whereas fracture stress was successfully retained at a value of 1815 MPa. The high plastic strain of Zr55Cu20Ni8Al10Ti5Sc2 BMG can be attributed to the localized nanocrystallization phenomenon under uniaxial compression and to the high relaxed excess free volume (REFV) in ZrCuNiAlTiSc BMGs. The high REFV prevented the expansion of shear bands, generated secondary shear bands, and finally increased plasticity.
Cheng S.、Liu X.、Tian J.、Ma J.、Shen J.、Gao W.、Yang X.、Zhu J.
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Shenzhen Key Laboratory of High Performance Nontraditional Manufacturing College of Mechatronics and Control Engineering Shenzhen University
Weihai Power Co. Ltd
Science and Technology on Reliability Physics and Application of Electronic Component Laboratory The 5th Electronics Research Institute of the Ministry of Industry and Information Technology
NSTL
Elsevier
