Direct observation of the dynamic evolution of precipitates in aluminium alloy 7021 at high strain rates via high energy synchrotron X-rays
Direct observation of the dynamic evolution of precipitates in aluminium alloy 7021 at high strain rates via high energy synchrotron X-rays
复制标题
高能同步加速器X射线直接观察7021铝合金高应变率下析出相的动态演化
DOI：
10.1016/j.actamat.2020.116532
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发表时间：
2021
期刊：
影响因子：
9.4
通讯作者：
Mirihanage W
中科院分区：
文献类型：
--
作者：
Mirihanage W
提高对动态析出现象的理解对于精确地建模和模拟许多高强度铝合金的工业制造过程是重要的。7xxx铝合金中的动态时效可由于应变和热而发生。小角X射线散射（SAXS）是一种先进的技术，可以原位研究沉淀过程，但迄今为止，这只能在低于工业相关应变率（例如< 10−3）的情况下进行。在这篇文章中，我们展示了在比以前更高的应变率（10−2）下，使用高能同步辐射X射线对金属合金进行原位SAXS研究的潜力。时间分辨SAXS信息已被用来评估动态沉淀演变模型，并已证明，在高应变速率下，必须考虑一个新的制度，其中包括更显着的效果空位湮没，导致一个明确的应变速率，而不仅仅是应变，动力学依赖。
An improved understanding of the phenomenon of dynamic precipitation is important to accurately model and simulate many industrial manufacturing processes with high strength Al-alloys. Dynamic ageing in 7xxx Al-alloys can occur as a result of both the strain and heat. Small angle X-ray scattering (SAXS) is an advanced technique that allows the precipitation processes to be studied in situ, but to date this has only been possible at lower than industrially relevant strain rates (e.g. < 10−3). In this contribution, we demonstrate the potential of in-situ SAXS studies of metallic alloys at higher strain rates (10−2) than previously, using a high energy synchrotron X-ray. The time resolved SAXS information has been used to evaluate dynamic precipitate evolution models and has demonstrated that at high strain rates a new regime must be considered which includes the more significant effect of vacancy annihilation, leading to a clear strain rate, rather than just strain, kinetic dependence.
DOI：
10.1016/j.msea.2016.08.054
发表时间：
2016-10-15
影响因子：
6.4
作者：
Huo, Wangtu;Hou, Longgang;Zhang, Jishan
通讯作者：
Zhang, Jishan