Time-resolved synchrotron tomographic quantification of deformation during indentation of an equiaxed semi-solid granular alloy
Time-resolved synchrotron tomographic quantification of deformation during indentation of an equiaxed semi-solid granular alloy
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DOI：
10.1016/j.actamat.2015.11.028
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发表时间：
2016-02-15
期刊：
影响因子：
9.4
通讯作者：
Connolley, T.
中科院分区：
文献类型：
--
作者：
Cai, B.;Lee, P. D.;Connolley, T.
压痕是一种成熟的技术，用于在连续水平上测量固体材料的机械性能，如硬度和蠕变。在本研究中，我们对一种半固态颗粒合金进行了等轴枝晶组织的压痕。使用一种新的热机械装置结合4D(三个空间维度加时间)同步加速器层析成像和数字体积相关来量化所产生的微结构效应。这些实验不仅揭示了在微观结构水平上发生的多种变形机制(例如，膨胀、液体流动、宏观偏析、收缩空洞和晶内变形)，而且还可以量化材料内部应变场的演变。由此产生的方法是一个强大的工具，以评估局部变形的演变，从而材料的性质。(C)爱思唯尔有限公司出版的2015年Acta Materialia Inc.
Indentation is a well-established technique for measuring mechanical properties, such as hardness and creep, in solid materials at a continuum level. In this study, we performed indentation of a semi-solid granular alloy with an equiaxed dendritic microstructure. The resulting microstructural effects were quantified using a novel thermo-mechanical setup combined with 4D (three spatial dimensions plus time) synchrotron tomography and digital volume correlation. The experiments not only revealed the multitude of deformation mechanisms occurring at a microstructural level, (e.g. dilatancy, liquid flow, macrosegregation, shrinkage voids, and intra-granular deformation), but also allowed quantification of the evolution of the strain fields within the material. The resulting methodology is a powerful tool for assessing the evolution of localized deformation and hence material properties. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd.