摘要
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T1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Zr56.64Cu17.28Ni12.48Al9.6Ti4具有最好的玻璃形成能力.此时△Tx=77.6℃,Trg(Tg/T1)=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 (Zr(0.69)Cu(0.18)Ni(0.13)AI(0.10))(100-x) Ti-x (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 T-1 decreases obviously when Ti content (x) increases from 0 to 4, meanwhile the reduced glass temperature (T-rg) increases from 0.62 to 0.65. When x exceeds 4, however, T-1 increases and T-rg decreases respectively with increasing T-i 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 DeltaTx is 77.6 degreesC. 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.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第4期416-420,共5页
Acta Metallurgica Sinica
