Formation of cerium-based bulk metallic glasses
Formation of cerium-based bulk metallic glasses
复制标题
DOI：
10.1016/j.actamat.2006.02.044
复制
发表时间：
2006-06
期刊：
影响因子：
9.4
通讯作者：
Bo Zhang;Dongshan Zhao;M. Pan;Rusong Wang;Weihua Wang
中科院分区：
文献类型：
--
作者：
Bo Zhang;Dongshan Zhao;M. Pan;Rusong Wang;Weihua Wang
本文报道了Ce基大块非晶合金的形成和组成范围。用常规铜模铸造法可以在较宽的成分范围内容易地制备出直径为1- 3 mm的Ce-Al-Cu（Co，Ni）三元非晶合金棒。用低成本的富铈混合稀土（MM）代替Ce，可以获得具有类似高玻璃形成能力（GFA）的MM-Al-Cu块体玻璃。在Ce-Al-Cu基体中加入少量Fe、Co、Ni、Nb、Zn、Si等元素，可使全玻璃棒的临界直径从2 mm提高到3- 10 mm。研究发现，常用的大块金属玻璃形成的经验判据不能解释大块金属玻璃的形成过程以及添加剂对玻璃形成的影响。研究了微合金化对非晶合金非晶形成的显著影响及其机理。这些材料具有极低的玻璃化转变温度（341- 439 K，甚至低于水的沸点）和优异的低温变形性能，具有潜在的应用前景。
We report the formation and composition range of Ce-based bulk metallic glasses. Ternary Ce–Al–Cu(Co,Ni) glassy rods of 1–3mm in diameter can be easily formed in a wide composition range by a conventional copper mold cast method. Substituting Ce with low-cost Ce-rich misch metal (MM), MM–Al–Cu bulk glasses with a similar high glass-forming ability (GFA) can be obtained. With minor addition of extra elements such as Fe, Co, Ni, Nb, Zn and Si, the critical diameter of the full glassy rods of the Ce–Al–Cu matrix can be markedly enhanced from 2mm to at least 3–10mm. It is found that the often-cited empirical criteria for bulk metallic glass formation cannot interpret the formation and the addition effect on GFA of the metallic glasses. The striking effect and mechanism of microalloying on the GFA of the metallic glasses are studied. These materials with extremely low glass transition temperatures (341–439K, even below the boiling temperature of water) and excellent deformability at low temperatures could have potential applications.