Super plastic bulk metallic glasses at room temperature
Super plastic bulk metallic glasses at room temperature
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DOI：
10.1126/science.1136726
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发表时间：
2007-03-09
期刊：
影响因子：
56.9
通讯作者：
Wang, Wei Hua
中科院分区：
文献类型：
--
作者：
Liu, Yan Hui;Wang, Gang;Wang, Wei Hua
与大块金属玻璃通常表现出的较差塑性相反，通过控制弹性模量对成分进行适当选择而合成的ZrCuNiAl在室温下实现了超塑性。微观结构分析表明，超塑性大块金属玻璃由被软区包围的硬区组成，这使得该金属玻璃能够承受超过160%的真实应变。这一发现为解决金属玻璃的脆性问题提供了一种思路，并且对理解金属玻璃的变形机制具有重要意义。
In contrast to the poor plasticity that is usually observed in bulk metallic glasses, super plasticity is achieved at room temperature in ZrCuNiAl synthesized through the appropriate choice of its composition by controlling elastic moduli. Microstructures analysis indicates that the super plastic bulk metallic glasses are composed of hard regions surrounded by soft regions, which enable the glasses to undergo true strain of more than 160%. This finding is suggestive of a solution to the problem of brittleness in, and has implications for understanding the deformation mechanism of, metallic glasses.