Temperature Effect on Fracture of a Zr-Based Bulk Metallic Glass
Temperature Effect on Fracture of a Zr-Based Bulk Metallic Glass
复制标题
温度对锆基大块金属玻璃断裂的影响
DOI：
10.3390/ma13102391
复制
发表时间：
2020-05-01
期刊：
影响因子：
3.4
通讯作者：
Wang, Gang
中科院分区：
文献类型：
--
作者：
Yang, Na;Yi, Jun;Wang, Gang
块体金属玻璃（BMG）具有优良的上级力学性能，在工程结构中具有广泛的应用前景。研究了几种非晶合金在低温和高温下的断裂韧性。然而，BMG韧性的温度依赖性的机制仍然是难以捉摸的。在这里，我们的特点是断裂韧性的Zr 61 Ti 2 Cu 25 Al 12 BMG制备的Zr元素片与低Hf含量在134至623 K的温度范围内。的弛豫谱的BMG的特征在于使用相同的温度范围内的动态力学分析。我们发现，BMG是更强硬的松弛过程的起始温度比在峰值温度。BMG的温度相关断裂韧性强烈依赖于其弛豫谱。
Bulk metallic glass (BMGs) is highly expected for applications in engineering structures due to their superior mechanical properties. The fracture toughness of some BMGs was investigated at cryogenic and at elevated temperatures. However, the mechanism of the temperature-dependence of BMG toughness still remains elusive. Here, we characterized the fracture toughness of Zr61Ti2Cu25Al12 BMG prepared with Zr elemental pieces with low Hf content at temperatures ranging from 134 to 623 K. The relaxation spectrum of the BMG was characterized by a dynamic mechanical analysis using the same temperature range. We found that the BMG is tougher at onset temperatures of the relaxation processes than at peak temperatures. The temperature-dependent fracture toughness of the BMG is strongly dependent on its relaxation spectrum.