微尺度Zr52.5Cu17.9Ni14.6Al10Ti5非晶合金弯曲断裂性能的研究
In situ micro-bending tests to study fracture properties of Zr52.5 Cu17.9 Ni14.6 Al10Ti5 (Vit105)
本文采用原位悬臂梁弯曲试验研究了微尺度Zr52.5Cu17.9Ni14.6Al10Ti5（Vit105）非晶合金试样的弯曲断裂行为。采用聚焦离子束加工技术制备特征尺寸为微米尺寸和亚微米尺寸的缺口悬臂梁试样，利用扫描电子显微镜及透射电子显微镜中的力学测试系统进行原位弯曲性能测试。结果表明Zr52.5Cu17.9Ni14.6Al10Ti5非晶合金微米尺寸试样弯曲行为具有尺寸效应。随着试样尺寸的减小，Zr52.5Cu17.9Ni14.6Al10Ti5非晶合金弯曲变形的能力显著提高。同时，试样尺寸减小非晶合金的断裂韧性提高。这种强烈的尺寸效应是由于试样尺寸的减小，剪切带形核困难，非晶合金变形机制发生转变所引起的。
In this paper, the bending properties and fracture mechanism of Zr52.5Cu17.9Ni14.6Al10Ti5 metallic glass are investigated by means of quantitative in-situ bending tests for micron sized cantilever beams. These micron sized notched cantilever beams were fabricated using focused ion beam(FIB) system. In situ experiments were performed inside the chamber of an FIB or a TEM. Size-dependent fracture mechanism has been observed. With the decrease of the specimen size, deformation mechansim of metallic glass shows a trend from brittle fracture to uniform plastic deformation. And the fracture toughness increases with decreasing sample size. The size effect of deformation mechanism transition attribute to limited shear band nucleation in small scaled MGs.
江峰、孙军、王晓磊
材料科学金属学、热处理
非晶合金悬臂梁原位断裂韧性微尺度
Metallic glassCantilever beamIn-situFracture toughnessMicron-scale
江峰,孙军,王晓磊.微尺度Zr52.5Cu17.9Ni14.6Al10Ti5非晶合金弯曲断裂性能的研究[EB/OL].(2015-05-11)[2025-08-26].http://www.paper.edu.cn/releasepaper/content/201505-90.点此复制
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