首页|金属玻璃中取决于加载速率的非均匀蠕变行为

金属玻璃中取决于加载速率的非均匀蠕变行为

Rate-dependent inhomogeneous creep behavior in metallic glasses

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大块金属玻璃中的蠕变变形可分为均匀流动和非均匀流动.为了理解两种蠕变变形的转化条件,使用纳米压痕试验和分子动力学模拟研究加载速率对Ti40Zr10Cu47Sn3(摩尔分数,％)大块金属玻璃室温蠕变行为的影响.结果发现,在低加载速率下,加载阶段出现很多的锯齿流动,导致蠕变阶段出现非均匀的锯齿流动;而当加载速率足够高时,蠕变变形趋向于均匀流动.详细讨论与速率相关的蠕变行为的相关机制,发现关键因素是预先存在的主要剪切带的数量,该数量受加载速率的影响较大.
Creep deformation can be classified as homogeneous flow and inhomogeneous flow in bulk metallic glass (BMG). In order to understand the conversion conditions of the two types of creep deformation, the effect of loading rate on the creep behavior of a Ti40Zr10Cu47Sn3 (at.％) BMG at ambient temperature was investigated using nanoindentation and molecular dynamic simulation. Results indicate that at low loading rates, many serrations appear in loading stage, leading to inhomogeneous serrated flow in the creep stage. When the loading rate is high enough, the creep deformation tends to be homogeneous. The related mechanism responsible for the rate-dependent creep behavior is attributed to the number of pre-existing major shear bands which is influenced significantly by the loading rate.

metallic glassesnanoindentationloading rateinhomogeneous creepshear band

吴宏、徐峰、任俊业、兰小东、殷勇、梁陆新、宋旼、刘咏、李甲、李清湘、黄卫东

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中南大学 粉末冶金国家重点实验室,长沙 410083

深圳市中金岭南有色金属股份有限公司,深圳 518040

西北工业大学 材料科学与工程学院,西安 710072

湖南华曙高科技有限责任公司,长沙 410205

湖南大学 汽车车身先进设计制造国家重点实验室,长沙 410082

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金属玻璃 纳米压痕 加载速率 非均匀蠕变 剪切带

This work was supported by the National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaKey Research and Development Program of Hunan Province,ChinaChina Post-doctoral Science FoundationFundamental Research Funds for the Central Universities of Central South University,ChinaFundamental Research Funds for the Central Universities of Central South University,ChinaFundamental Research Funds for the Central Universities of Central South University,China

2016YFB1100103517712332016JC20032018M6331642018ZZTS127CX201901902019ZZTS-134

2021

10.1016/S1003-6326(21)65614-5

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(6)
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