期刊
ACTA MATERIALIA
卷 207, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2021.116686
关键词
Solidification; Casting; Metallic alloy; Microstructure; Multiscale modeling
资金
- European Research Council under the European Union [669141]
- European Union [842795]
- Spanish Ministry of Science and Innovation [RTI2018-098245]
- Spanish Ministry of Education [FPU15/00403]
- NVIDIA Corporation
- Purdue University
- Marie Curie Actions (MSCA) [842795] Funding Source: Marie Curie Actions (MSCA)
- European Research Council (ERC) [669141] Funding Source: European Research Council (ERC)
This article combines casting experiments and quantitative simulations to predict local primary dendritic spacings in metallic alloys solidified in conditions relevant to industrial casting processes. The results show good agreement between experimental results and simulations for non-dilute Al-Cu alloys. Simulations suggest widening of the PDAS stability range with a decrease of the temperature gradient.
Microstructural length scales, such as dendritic spacings in cast metallic alloys, play an essential role in the properties of structural components. Therefore, quantitative prediction of such length scales through simulations is important to design novel alloys and optimize processing conditions through integrated computational materials engineering (ICME). Thus far, quantitative comparisons between experiments and simulations of primary dendrite arms spacings (PDAS) selection in metallic alloys have been mainly limited to directional solidification of thin samples and quantitative phase-field simulations of dilute alloys. In this article, we combine casting experiments and quantitative simulations to present a novel multiscale modeling approach to predict local primary dendritic spacings in metallic alloys solidified in conditions relevant to industrial casting processes. To this end, primary dendritic spacings were measured in instrumented casting experiments in Al-Cu alloys containing 1 wt.% and 4 wt.% of Cu, and they were compared to spacing stability ranges and average spacings in dendritic arrays simulated using phase-field (PF) and dendritic needle network (DNN) models. It is first shown that PF and DNN lead to similar results for the Al-1 wt.%Cu alloy, using a dendrite tip selection constant calculated with PF in the DNN simulations. PF simulations cannot achieve quantitative predictions for the Al-4 wt.%Cu alloy because they are too computationally demanding due to the large separation of scale between tip radius and diffusion length, a characteristic feature of non-dilute alloys. Nevertheless, the results of DNN simulations for non-dilute Al-Cu alloys are in overall good agreement with our experimental results as well as with those of an extensive literature review. Simulations consistently suggest a widening of the PDAS stability range with a decrease of the temperature gradient as the microstructure goes from cellular-dendrites to well-developed hierarchical dendrites. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据