Complete Composition Tunability of Cu(Ni)-Ti-Zr Alloys for Bulk Metallic Glass Formation

作     者：Ze-xiu Zhang Chun-li Dai Jian Xu 

作者机构：Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences 72 Wenhua Road Shenyang 110016 China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2009年第25卷第1期

页      面：39-47页

核心收录：

学科分类：08[工学] 0822[工学-轻工技术与工程] 

基　　金：supported by the National Natural Science Foundation of China under Grant No. 50671105 the National Basic Research Program of China (973 Program) under contract No. 2007CB613906 

主　　题：Bulk metallic glasses Amorphous alloys Eutectic Copper 

摘      要：In the Cu-Zr-Ti ternary system, a new composition zone of bulk metallic glasses （BMGs） formation was discovered, locating at the 55-57 at. pct Cu, 30-31 at. pct Ti and 13-14 at. pct Zr, and near Cu-Ti binary subsystem rather than the Cu-Zr binary. For these alloys, BMG rods of 2 mm in diameter can be fabricated by using copper mould casting. It is expected that these 13MG-forming alloys correlate with （L →CuTi＋Cu2TiZr＋Cu51Zr14） eutectic reaction that the undercooled melt undergoes during solidification. Adopting ＂3D pinpointing approach＂, compositional dependence of glass-forming ability （GFA） in Cu（Ni）-Ti-Zr pseudo ternary system was revisited. Optimized BMG-forming composition is located at Cu50.4Ni5.6Ti31Zr13, with a critical diameter of 6 mm for complete BMG formation. Its GFA is significantly superior to Vit 101 （Cu47Ni8Ti34Zr11） previously developed by Caltech group. The effect that the GFA of the ternary base alloy was improved by substitution of Ni for Cu is attributed to a role of retarding the crystallization of Cu51Zr14 intermetallics.