Metallic glasses (MGs) have unusual structural characteristics and resulting unique properties, but effectively modulating their structure is difficult. The recently achieved two-way structural tuning (ordering-disordering) between distinct states in MGs offers an opportunity to overcome this challenge. However, pressures up to tens of GPa were required for the process, which limits sample sizes at the micrometer scale and challenges further comprehensive research. Here, by introducing concurrent shear straining with compressive force using high-pressure torsion, the pressure to trigger the disordering transition is significantly reduced to a few GPa. This enables the acquisition of millimeter-sized samples for comprehensive study, including synchrotron x-ray diffraction and small angle x-ray scatting, nanoindentation, electrical resistivity, and differential scanning calorimetry. It is evidenced that the two-way tuning of MG can be achieved both structurally and thermodynamically, which could help deepen our understanding of the mechanism behind the two-way tuning and promote exploration of distinct MGs.

中文翻译：

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剪切应变促进了块状金属玻璃的结构转变

金属玻璃（MG）具有不寻常的结构特征和由此产生的独特性能，但有效调节其结构很困难。最近实现的 MG 不同状态之间的双向结构调整（有序-无序）为克服这一挑战提供了机会。然而，该过程需要高达数十 GPa 的压力，这限制了微米级的样品尺寸，并对进一步的综合研究提出了挑战。在这里，通过使用高压扭转引入并发剪切应变和压缩力，触发无序转变的压力显着降低至几个 GPa。这使得能够采集毫米大小的样品进行综合研究，包括同步加速器 X 射线衍射和小角度 X 射线散射、纳米压痕、电阻率和差示扫描量热法。事实证明，MG的双向调节可以在结构和热力学上实现，这有助于加深我们对双向调节背后机制的理解，并促进对不同MG的探索。