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Materials 2011, 4(12), 2183-2196; doi:10.3390/ma4122183
Article

Novel Concept to Detect an Optimum Thixoforming Condition of Al-Al3Ni Functionally Graded Material by Wavelet Analysis for Online Operation

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Received: 31 October 2011; in revised form: 8 December 2011 / Accepted: 9 December 2011 / Published: 14 December 2011
(This article belongs to the Special Issue Advances in Functionally Graded Materials)
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Abstract: A novel technique to characterize the transition phenomenon from solid to melt of Al-Al3Ni functionally graded material (FGM) through a wavelet analysis for the development of a thixoforming system is investigated. Identification of an optimum semi-solid condition for thixoforming is necessary not only for the construction of a system but also the fabrication of a near-net-shape product with fine microstructure. An online wavelet analysis system using Haar’s wavelet function, which is applied for its simplicity compared with Daubechies’ wavelet function, is developed to find the optimum operating condition. A thixoforming system, which is constructed adapting a threshold value as an index, monitors successfully a discontinuity of deformation of Al-Al3Ni FGM with the temperature rise. Thus, the timing of an operation is not at pre-fixed temperature but at the time when the index related to a wavelet function is satisfied. The concept is confirmed to be suitable from the micro-structural observation of the Al-Al3Ni FGM product, because the product under the optimum condition is found to have refined Al3Ni grains, which change from coarse grains and are expected to improve the mechanical properties.
Keywords: wavelet analysis; control; thixoforming; functionally graded material; intermetallic compound wavelet analysis; control; thixoforming; functionally graded material; intermetallic compound
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Kumazawa, N.; Fukui, Y.; Nara, D. Novel Concept to Detect an Optimum Thixoforming Condition of Al-Al3Ni Functionally Graded Material by Wavelet Analysis for Online Operation. Materials 2011, 4, 2183-2196.

AMA Style

Kumazawa N, Fukui Y, Nara D. Novel Concept to Detect an Optimum Thixoforming Condition of Al-Al3Ni Functionally Graded Material by Wavelet Analysis for Online Operation. Materials. 2011; 4(12):2183-2196.

Chicago/Turabian Style

Kumazawa, Noriyoshi; Fukui, Yasuyoshi; Nara, Daisaku. 2011. "Novel Concept to Detect an Optimum Thixoforming Condition of Al-Al3Ni Functionally Graded Material by Wavelet Analysis for Online Operation." Materials 4, no. 12: 2183-2196.


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