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首页> 外文会议>Multiscale, multifunctional and functionally graded materials >Effect of Casting Condition on Density and Hardness Gradients of Al-Al_2Cu Alloy FGM Fabricated by Centrifugal in-situ Method
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Effect of Casting Condition on Density and Hardness Gradients of Al-Al_2Cu Alloy FGM Fabricated by Centrifugal in-situ Method

机译：铸造条件对离心原位法制备Al-Al_2Cu合金FGM的密度和硬度梯度的影响

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摘要

Functionally graded material (FGM) is a combined material that has a component gradient from one material at one surface to another material at the opposite surface. As one of the fabrication processes of FGM, centrifugal in-situ method has been proposed. Centrifugal in-situ method is a casting that centrifugal force is applied during solidification to both the primary crystal and the matrix. In a previous study, the density and hardness gradients of Al-3mass%Cu FGM ring fabricated by centrifugal in-situ method have been investigated. According to the study, Cu concentration within the FGM ring monolithically increases towards the ring's inner position, and its density also increases toward inner region. This is because the density of the primary α-Al crystal is larger than that of the molten Al-Cu alloy in the early stage of solidification. Based on this solidification process, it is considered that the casting condition and the initial Cu concentration of Al-Cu master alloy affect on the density and hardness gradients in the Al-Cu FGM ring. In this study, effects of the casting condition on the density and hardness gradients of Al-Al_2CU FGM rings fabricated by the centrifugal in-situ method were investigated. It was found that density gradient of the Al-A_2Cu FGM rings increases with increasing Cu concentration of Al-Cu master alloys. Also, processing temperature for Al-Cu master alloy can control density gradient of Al-Al_2Cu FGM rings. These phenomena were explained by variation of the densities of primary α-Al and the molten Al matrix during the solidification.
机译：功能梯度材料（FGM）是一种组合材料，其成分梯度从一个表面上的一种材料到另一表面上的另一种材料。作为FGM的制造工艺之一，提出了离心原位法。离心原位法是一种在凝固过程中对原始晶体和基体都施加离心力的铸件。在以前的研究中，研究了通过离心原位法制备的Al-3质量％Cu FGM环的密度和硬度梯度。根据研究，FGM环中的Cu浓度朝着环的内部位置整体增加，其密度也朝着内部区域增加。这是因为在凝固的初期，初生α-Al晶体的密度大于熔融Al-Cu合金的密度。基于该凝固过程，认为铸造条件和Al-Cu中间合金的初始Cu浓度影响Al-Cu FGM环中的密度和硬度梯度。本文研究了铸造条件对离心原位法制备的Al-Al_2CU FGM环的密度和硬度梯度的影响。发现随着Al-Cu中间合金中Cu浓度的增加，Al-A_2Cu FGM环的密度梯度增加。而且，Al-Cu中间合金的加工温度可以控制Al-Al_2Cu FGM环的密度梯度。这些现象可以通过凝固过程中初生α-Al和熔融Al基体的密度变化来解释。

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