Shear punching of bulk metallic glasses under low stress

Shear punching of bulk metallic glasses under low stress
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低应力下大块金属玻璃的剪切冲裁

DOI:
10.1016/j.matdes.2020.108595
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发表时间:
2020-05
影响因子:
8.4
通讯作者:
Wei-hua Wang
Wei-hua Wang
中科院分区:
材料科学1区
文献类型:
--
作者:
Fei Sun;Bei Wang;Feng Luo;Yu-qiang Yan;Hai-bo Ke;Jinag Ma;Jun Shen;Wei-hua Wang

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大块金属玻璃(BMG)具有优异的机械性能,但室温下的高效加工能力较差,限制了BMG的应用。在这里,我们报告了一种适合 BMG 加工的高效节能冲压方法。利用冲头上的超声波振动,可以在 110 MPa 的极低冲头压力下,将厚度为 1 mm 的 BMG 板快速制造出精确的形状,不到传统理论估计值的十分之一。超声振动辅助冲压过程中 BMG 软化的重要物理机制可以通过循环液化或 BMG 弹性基体中液体状区域的激活和连接来解释。该工作将为解决BMG的室温加工问题提供一条新途径,促进BMG在精密制造领域的更广泛应用。
Bulk metallic glasses (BMGs) possess excellent mechanical properties yet poor efficient processing ability at room temperature which limits the application of BMGs. Here, we report a high efficiency and energy-saving punching method suitable for processing of BMGs. By use of ultrasonic vibration on the punch, the accurate shape can be quickly manufactured from a BMG plate with a thickness upon 1 mm at an extremely low punch pressure of 110 MPa, which is less than one tenth of the estimated value by conventional theory. The underline physical mechanism of softening in BMG during the ultrasonic vibration assisted punching process was interpreted by cyclic liquefaction or the activation and connection of liquid-like regions in the elastic matrix of BMGs. This work would provide a novel route for solving the machining problem of BMGs at room temperature and promote wider applications of BMGs in precision manufacturing field.
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