The prominent combination of ultrahigh strength and superior tensile plasticity in Cu-Zr nanoglass connected by oxide interfaces: A molecular dynamics study
The prominent combination of ultrahigh strength and superior tensile plasticity in Cu-Zr nanoglass connected by oxide interfaces: A molecular dynamics study
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通过氧化物界面连接的 Cu-Zr 纳米玻璃中超高强度和卓越拉伸塑性的显着组合：分子动力学研究
DOI：
10.1016/j.jallcom.2019.06.097
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发表时间：
2019
影响因子：
6.2
通讯作者：
Wang Xin Yun
中科院分区：
文献类型：
--
作者：
Zhang Mao;Li Qiao Min;Zhang Jia Cheng;Zheng Guang Ping;Wang Xin Yun
提出了一种新型 Cu-Zr 纳米玻璃，由通过氧化物界面连接的玻璃纳米细胞组成。与传统的纳米玻璃相比，新型氧化物连接的纳米玻璃在环境温度下具有超高的拉伸强度和优异的拉伸塑性。在承受拉伸载荷时，由于存在过量的自由体积，氧化物界面被发现促进了剪切转变区（STZ）的成核。同时，氧化物界面中金属和氧原子之间的牢固键合使得STZ难以传播。因此，STZ 有效地增殖并限制在细胞内部，而没有形成任何成熟的剪切带 (SB)。研究结果为增韧金属玻璃提供了新的思路，使金属玻璃具有塑性和强度的良好结合，从而有可能克服长期存在的强度-延展性权衡困境。
A novel Cu–Zr nanoglass consisting of glassy nano-cells connected by oxide interfaces is proposed. Compared to conventional nanoglasses, the novel oxide-connected nanoglass presents ultrahigh tensile strength and superior tensile plasticity at ambient temperature. Subjected to tensile loading, the oxide interfaces are found to promote the nucleation of shear transformation zones (STZs) due to the existence of excess free volume. Meanwhile, the strong bonding between metallic and oxygen atoms in the oxide interface makes it difficult for STZs to propagate through. Thus, the STZs are effectively proliferated and confined inside the cell interior without any mature shear band (SB) formed. The results provide new ideas for toughening metallic glasses with a decent combination of plasticity and strength, thus making it possible to overcome the longstanding strength-ductility trade-off dilemma.