(哈尔滨工业大学 材料科学与工程学院， 哈尔滨 150001)
摘 要: 采用自行研制的微成形系统进行热压缩实验， 分别研究成形温度、 成形时间和冲头速度等对尺寸为d 1 mm×1.5 mm的Zr41.2Ti13.8Cu12.5Ni10Be22.5块体非晶合金(Vit.1)在过冷液相区微塑性成形性能的影响规律。 进一步研究了不同坯料尺寸对Vit.1块体非晶合金在过冷液相区超塑性成形性能的影响程度， 结果表明流动应力随坯料尺寸的减小而降低。 在此基础上， 利用闭式模锻方法成形了分度圆直径为d 1 mm的微型齿轮， 采用SEM观察成形件的表面形貌， 结果表明采用微成形方法可以获得尺寸精度较高的Vit.1块体非晶合金微型齿轮。
关键字: Zr基非晶合金； 块体非晶合金； 过冷液相区； 微成形性能； 微型齿轮
（School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China）
Abstract: The microforming behavior of Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass (Vit.1) in the supercooled liquid region was investigated. The stress-strain relations for Vit.1 were established in uniaxial compression tests using the microforming system. Firstly, the effects of forming time, temperature and punch velocity on the flow stress of the specimens with a typical size of d 1 mm×1.5 mm were analyzed. Further more, the effects of the specimen size were discussed. The results indicate that the flow stress of Vit.1 decreases with the specimen size decreasing. Based on the research, the Vit.1 microgears with reference diameter of 1 mm were fabricated by closed die forging and observed by SEM. The results show that the Vit.1 microgears can be formed successfully in the supercooled liquid region using the microforming technology.
Key words: Zr based amorphous alloys; bulk metallic glass; supercooled liquid region; microforming behavior; microgear
