(哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院， 哈爾濱 150001)
摘 要: 采用自行研制的微成形系統(tǒng)進(jìn)行熱壓縮實驗， 分別研究成形溫度、 成形時間和沖頭速度等對尺寸為d 1 mm×1.5 mm的Zr41.2Ti13.8Cu12.5Ni10Be22.5塊體非晶合金(Vit.1)在過冷液相區(qū)微塑性成形性能的影響規(guī)律。 進(jìn)一步研究了不同坯料尺寸對Vit.1塊體非晶合金在過冷液相區(qū)超塑性成形性能的影響程度， 結(jié)果表明流動應(yīng)力隨坯料尺寸的減小而降低。 在此基礎(chǔ)上， 利用閉式模鍛方法成形了分度圓直徑為d 1 mm的微型齒輪， 采用SEM觀察成形件的表面形貌， 結(jié)果表明采用微成形方法可以獲得尺寸精度較高的Vit.1塊體非晶合金微型齒輪。
關(guān)鍵字: Zr基非晶合金； 塊體非晶合金； 過冷液相區(qū)； 微成形性能； 微型齒輪
（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
