Luan Hengwei, Zhang Xin, Ding Hongyu, Zhang Fei, Luan J H, Jiao Z B, Yang Yi-Chieh, Bu Hengtong, Wang Ranbin, Gu Jialun, Shao Chunlin, Yu Qing, Shao Yang, Zeng Qiaoshi, Chen Na, Liu C T, Yao Ke-Fu
School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China.
Center for High Pressure Science and Technology Advanced Research, 201203, Shanghai, China.
Nat Commun. 2022 Apr 21;13(1):2183. doi: 10.1038/s41467-022-29789-1.
Glass-to-glass transitions are useful for us to understand the glass nature, but it remains difficult to tune the metallic glass into significantly different glass states. Here, we have demonstrated that the high-entropy can enhance the degree of disorder in an equiatomic high-entropy metallic glass NbNiZrTiCo and elevate it to a high-energy glass state. An unusual glass-to-glass phase transition is discovered during heating with an enormous heat release even larger than that of the following crystallization at higher temperatures. Dramatic atomic rearrangement with a short- and medium-range ordering is revealed by in-situ synchrotron X-ray diffraction analyses. This glass-to-glass transition leads to a significant improvement in the modulus, hardness, and thermal stability, all of which could promote their applications. Based on the proposed high-entropy effect, two high-entropy metallic glasses are developed and they show similar glass-to-glass transitions. These findings uncover a high-entropy effect in metallic glasses and create a pathway for tuning the glass states and properties.
玻璃到玻璃的转变有助于我们理解玻璃的本质，但将金属玻璃调整到显著不同的玻璃态仍然很困难。在这里，我们已经证明，高熵可以提高等原子高熵金属玻璃NbNiZrTiCo中的无序度，并将其提升到高能玻璃态。在加热过程中发现了一种不寻常的玻璃到玻璃的相变，伴随着巨大的热释放，甚至比在更高温度下随后的结晶热释放还要大。原位同步辐射X射线衍射分析揭示了具有短程和中程有序的剧烈原子重排。这种玻璃到玻璃的转变导致模量、硬度和热稳定性的显著提高，所有这些都可以促进它们的应用。基于所提出的高熵效应，开发了两种高熵金属玻璃，它们表现出相似的玻璃到玻璃的转变。这些发现揭示了金属玻璃中的高熵效应，并为调整玻璃态和性能创造了一条途径。
