Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第7期    总第64期    2004年7月

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文章编号:1004-0609(2004)07-1073-05
Zr基大块非晶合金的超塑性成形性能
张志豪, 刘新华, 周  成, 谢建新

( 北京科技大学 材料科学与工程学院, 北京 100083)

摘 要: 研究了Zr41.25Ti13.75Ni10Cu12.5Be22.5大块非晶合金的过冷温度区域范围、 时间—温度—转变曲线及其在过冷温度区域的力学行为, 并在此基础上, 对精密凸轮零件进行了模锻成形实验, 分析了不同温度和应变速率对成形结果的影响。 结果表明: Zr41.25Ti13.75Ni10Cu12.5Be22.5大块非晶合金在635.6~710.4K的过冷区域范围内, 其应变速率敏感系数接近1, 具有良好的超塑性性能; 较理想的超塑性成形温度为653~668K, 应变速率为5.0×10-4 ~5.0×10-3 s-1。 在温度为668K、 应变速率为5.0×10-4 s-1的工艺条件下, 非晶合金的可成形时间大于1000s, 最大流动应力小于70MPa。

 

关键字: 大块非晶合金; 过冷区域; 超塑性; 成形

Superplastic forming properties of Zr-based bulk amorphous alloys
ZHANG Zhi-hao, LIU Xin-hua, 
ZHOU Cheng, XIE Jian-xin

School of Materials Science and Engineering,
University of Science and Technology Beijing, Beijing 100083, China

Abstract: Super-cooled liquid region, time-temperature-transformation diagram, and mechanical behavior of Zr41.25Ti13.75Ni10Cu12.5Be22.5 in the super-cooled liquid region were investigated , and based on which , precision cams are fabricated by using die forging method. The effects of different temperatures and different strain rates on the formability were analyzed. The results show that Zr41.25Ti13.75Ni10Cu12.5Be22.5 bulk amorphous alloy exhibits a good superplasticity formability in the super-cooled liquid region of 635.6-710.4K with the strain rate sensitivity exponent m-value being approximately 1.0. The acceptable temperature and strain rate range for superplastic forming of this material are 653 -668K and 5.0×10-4 -5.0×10-3 s-1 respectively. Under the processing conditions of 668K and 5.0×10-4s-1, the incubation time for retaining the glassy phase without decomposition reaches 1000s and the largest flow stress is less than 70 MPa.

 

Key words: bulk amorphous glass; super-cooled liquid state; superplasticity; forming

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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