Abstract Bending proof strength (σp) is a key material property for spring-like flexible components. In this work, initial yielding behavior of Zr61Ti2Cu25Al12 (ZT1) bulk metallic glass (BMG) in bending was investigated by an approach of stepwise cyclic loading-unloading under three-point bending (3 PB). It was shown that to meet the requirement of small-deflection condition in mechanics, a range of span-to-thickness ratio was specified at 10–15 for the BMGs subjected to 3 PB, which is one order of magnitude less than that of conventional polycrystalline metals. With conventional monotonic loading tests, the modulus of elasticity in bending and the proportional limit/flexural yield strength of the ZT1 BMG were determined to be Eb = 84 GPa and 2070 MPa, respectively. Combining stepwise loading-unloading with LOM observations alternately, it was shown that apparent yielding response of ZT1 beam in bending directly correlates with the event of first shear-band initiation. With an approach of stepwise cyclic loading-unloading with a measure in high accuracy, the σp at a permanent strain of 0.005% for the ZT1 BMG was determined to be 1900 ± 10 MPa. It is noticeable that the σp of ZT1 BMG is ~16% higher than its uniaxial tensile strength. In addition, high modulus of resilience (22 MJ/m3) in bending for this BMG manifest significant advantage as a candidate material of flexible components in engineering.

中文翻译：

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Zr61Ti2Cu25Al12块状金属玻璃的抗弯强度及其与剪切带引发的相关性

摘要 抗弯强度 (σp) 是类弹簧柔性组件的关键材料特性。在这项工作中，通过在三点弯曲 (3 PB) 下逐步循环加载-卸载的方法研究了 Zr61Ti2Cu25Al12 (ZT1) 块状金属玻璃 (BMG) 在弯曲中的初始屈服行为。结果表明，为满足力学中小挠度工况的要求，将承受3 PB的BMG的跨厚比规定为10-15，比传统的低一个数量级。多晶金属。通过传统的单调加载试验，ZT1 BMG 的弯曲弹性模量和比例极限/弯曲屈服强度分别确定为 Eb = 84 GPa 和 2070 MPa。将逐步加载-卸载与 LOM 观察交替相结合，结果表明，ZT1 梁在弯曲中的明显屈服响应与第一次剪切带起始事件直接相关。采用高精度逐步循环加载卸载的方法，确定ZT1 BMG在0.005%永久应变下的σp为1900±10 MPa。值得注意的是，ZT1 BMG 的 σp 比其单轴拉伸强度高约 16%。此外，该 BMG 弯曲时的高弹性模量 (22 MJ/m3) 显示出作为工程柔性部件候选材料的显着优势。ZT1 BMG 的 005% 被确定为 1900 ± 10 MPa。值得注意的是，ZT1 BMG 的 σp 比其单轴拉伸强度高约 16%。此外，该 BMG 弯曲时的高弹性模量 (22 MJ/m3) 显示出作为工程柔性部件候选材料的显着优势。ZT1 BMG 的 005% 被确定为 1900 ± 10 MPa。值得注意的是，ZT1 BMG 的 σp 比其单轴拉伸强度高约 16%。此外，该 BMG 弯曲时的高弹性模量 (22 MJ/m3) 显示出作为工程柔性部件候选材料的显着优势。