Ti具有明显降低(Zr0.59Cu0.18Ni0.13Al0.10)100-xTix(x=0, 1, 2, ......6)合金液相线温度Tl并提高约化玻璃转变温度Trg的作用. 含Ti量不同的合金楔形试样中的非晶组织区域对比表明, x等于4左右的合金Zr56.64Cu17.28Ni{12.48Al9.6Ti4具有最好的玻璃 形成能力. 此时ΔTx=77.6℃, Trg(Tg/Tl)=0.65. 以电弧熔炼铜模铸造的方法可制备出此成分合金尺寸为直径10 mm、长70 mm的圆柱形完全非晶试样. 对含Ti量不同的楔形试样中过渡区(结晶--非晶混合组织区)结晶相的分析表明, 适量Ti的加入, 促进了合金熔体中多种金属间相的同时析出, 从而使各种结晶相之间的相互竞争和阻碍作用更强烈, 因而有助于 玻璃形成能力的提高.
The effect of Ti on glass--forming ability of bulk (Zr0.59Cu0.18Ni0.13Al0.10)100-xTix (x=0, 1, 2, ...... 6) alloys has been investigated by differential scanning calorimetry (DSC), differential thermal analysis (DTA), and X--ray diffraction (XRD). It is shown that the liquidus temperature Tl decreases obviously when Ti content (x) increases from 0 to 4, meanwhile the reduced glass temperature (Trg) increases from 0.62 to 0.65. When x exceeds 4, however, Tl increases and Trg decreases respectively with increasing Ti content. The wedge--shaped sample with x=4 has the largest amorphous region, i.e., has the highest relative glass--forming ability, and the relevant supercooled liquid region ΔTx is 77.6℃. The alloy with this composition can be cast into cylinder--like amorphous alloy with 10 mm in diameter and 70 mm in length or sheet--like with 3 mm thickness by arc melting and copper mold casting. More intermetallics phases exist in the amorphous--crystallization zone of the wedge--shape sample with x=4 than those of alloys with x=0 and x=2 as indicated by XRD results. It is suggested that the crystallization would be retarded by the interaction and competition of various phases, thus enabling a higher glass--forming ability.
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