利用旋转铜辊急冷法和铜模铸造法制备非晶合金薄带或圆棒,并采用X衍射仪(XRD)、差示扫描量热仪(DSC)和差示热分析仪(DTA)研究了Ta,Nb和Mo对Ti50Ni20Cu25Sn5非晶合金玻璃形成能力(GFA)的影响.结果表明,Ta的添加提高了Ti50Ni20Cu25Sn5合金的GFA,Mo的添加降低了该合金的GFA,Nb的添加则对该合金的GFA没有明显的影响;含Ta合金具有超过60 K的宽过冷液态区(△Tx),且其约化玻璃转变温度因子(Tg/Tm)大于含Nb合金和含Mo合金;采用常规铜模铸造法制备出了直径为1mm的(Ti0.5Ni0.2Cu0.25Sn0.05)98Ta2和(Ti0.5Ni0.2Cu0.25Sn0.05)96Ta4块状非晶圆棒;(Ti0.5Ni0.2Cu0.25Sn0.05)98Ta2块状非晶圆棒的Tg,△Tx和Tg/Tm分别为678 K,84 K和0.60,而(Ti0.5Ni0.2Cu0.25Sn0.05)96Ta4块状非晶圆棒的Tg,△Tx和Tg/Tm分别为680 K,70 K和0.60.
Effects of Ta, Nb and Mo additions on the glass-forming ability (GFA) of the Ti5oNi20Cu25Sn5 alloy were studied by melt-spinning and copper mold casting methods. X-ray diffraction (XRD), differential scanning calorimetry (DSC) and differential thermal analysis (DTA) . The results show that the GFA is improved by Ta additions and decreased by Mo additions. No obvious improvement is observed in Nb-added alloys. The Ta-added alloys exhibit a wide supercooled liquid region exceeding 60 K before crystallization. The reduced glass transition temperature (Tg/Tm) of the Ta-added alloys is higher than those of the Nb- and Mo-added alloys. Cylindrical rods of 1 mm in diameter containing fully glassy phase were successfully synthesized for(Ti0.5Ni0. 2Cu0. 25Sn0.05) 98Ta2 and (Ti0. 5Ni0. 2Cu0. 28Sn0. 08) 96Ta4 by conventional copper mold casting. The Tg, △ Tx and Tg/Tm of the bulk glassy rod are 678 K, 84 K and 0. 60 for (Ti0. 5Ni0.2Cu0.25Sn0. 05) 98Ta2 alloy, and are 680 K, 70 K and 0.60 for(Ti0. 5Ni0.2Cu0. 25Sn0. 05 )96Ta4 alloy respectively.
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