The Effect Of Dispersion Phase And Alloying On The Microstructure And Property Of Titanium Based Metallic Glass

Recently, metallic glass alloys, especially, Ti-based metallic glass alloys, are focused in material science field due to their excellent properties that are different from traditional metal materials. In this paper, bulk and ribbon sample were prepared by arc melting, inducing melting, injecting casting, sucking casting and melt-spun methods. The effect of W, SiC, Al, B on the microstructure, thermal stability and mechanical properties of Ti₄₀Zr₂₅Ni₈Cu₉Be₁₈ metallic glass were investigated by XRD, SEM, OM, TEM, DSC, mechanical testing machine and Vickers microhardness machine. The main conclusions are as follows:The Ti₄₀Zr₂₅Ni₈Cu₉Be₁₈ amorphous alloy with a diameter of 3mm was prepared by injection casting method. Its supercooled liquid region (ΔT_x) is 45K. It means that the alloy has good thermal stability. Its compression strength σ_bc and plastic strain ε_pc are 1963MPa and 3.9%, respectively.The effect of W on Ti₄₀Zr₂₅Ni₈Cu₉Be₁₈ metallic glass was investigated. The addition of W isn't able to change the amorphous structure of ribbon sample. But Ti_xW_1-x, CuTi and NiTi₂ crystal phases are distributed in the amorphous matrix when the size of sample is up to Φ3mm. At the same time, compression strength of alloy decreases dramatically and the hardness slightly increases.The property of Ti₄₀Zr₂₅Ni₈Cu₉Be₁₈ metallic glass could also be affected dramatically by low content of SiC. SiC reacts with the alloy melt dramatically. TiC and amorphous phase appear in the microstructure of ribbon sample. TiC Particulate can block or delay the precipitation of quasicrystalline phase of metallic alloy. It results in better thermal stability. The structure of Φ3mm sample are composed of TiC, silicides and amorphous. The hardness of alloy increases because of the horniness phase TiC.The effect of Al on Ti₄₀Zr₂₅Ni₈Cu₉Be₁₈ metallic glass with Φ3mm was investigated in this paper. The result shows that different volume fraction of nanocrystalline and quasicrystalline are obtained with the 5at% Al addition. The addition of Al improves T_g of the amorphous alloy and increases the supercooled liquid region ΔT_x of the amorphous alloy. It means the enhancement of the thermal...