Unveiling a new type of ultradense anomalous metallic glass with improved strength and ductility through a high-pressure heat treatment
Unveiling a new type of ultradense anomalous metallic glass with improved strength and ductility through a high-pressure heat treatment
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推出一种新型超致密异常金属玻璃，通过高压热处理提高强度和延展性
DOI：
10.1038/s41427-019-0175-1
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发表时间：
2019
影响因子：
9.7
通讯作者：
Saida Junji
中科院分区：
文献类型：
--
作者：
Yamada Rui;Shibazaki Yuki;Abe Yasuto;Ryu Wookha;Saida Junji
通过高压热处理（850K 下 5.5GPa）随后快速冷却 Zr50Cu40Al10 金属玻璃，发现了一种异常玻璃。尽管结晶温度和焓降低，但高分辨率透射电子显微镜分析表明，收集的块状样品仍保持完全无定形结构。样品的密度比铸态大0.6%，甚至比部分结晶态大。这些结果表明形成了无法通过常规退火获得的超致密填充玻璃。压缩测试结果表明杨氏模量和断裂强度显着增加，支持了异常金属玻璃的产生。此外，在处理过的样品中观察到可塑性。因此得出的结论是，高压热处理能够创造出一种新型玻璃，这种玻璃通常会被大气压下的结晶相所掩盖。我们通过在传统的体积 (v) - 温度 (T) 图中引入压力参数 (P) 来解释超密玻璃的形成。
An anomalous glass was discovered through high-pressure heat treatment (5.5 GPa at 850 K) followed by rapid cooling of a Zr50Cu40Al10metallic glass. Despite a reduction in the crystallization temperature and enthalpy, high-resolution transmission electron microscopy analysis revealed that the collected bulk sample maintained a fully amorphous structure. The density of the sample was 0.6% larger than that of the as-cast state and was even larger than that of the partially crystallized state. These results suggest the formation of an ultradense packing glass that cannot be obtained through conventional annealing. Compression test results indicated a significant increase in the Young’s modulus and fracture strength, supporting the creation of an anomalous metallic glass. In addition, plasticity was observed in the treated sample. It was therefore concluded that the high-pressure heat treatment enabled the creation of a new type of glass that is normally overshadowed by the crystallized phase at atmospheric pressure. We explained the creation of the ultradense glass by introducing a pressure parameter (P) to the conventional volume (v) - temperature (T) diagram.