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タイトル: Novel Concept to Detect an Optimum Thixoforming Condition of Al-Al3Ni Functionally Graded Material by Wavelet Analysis for Online Operation
著者: Kumazawa, Noriyoshi
Fukui, Yasuyoshi
Nara, Daisaku
Keywords: wavelet analysis
graded material
intermetallic compound
内容記述: 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.
公開者・出版者: MDPI
資源タイプ: Journal Article
著者版フラグ: publisher
ISSN: 1996-1944
DOI: 10.3390/ma4122183
雑誌名: materials
巻: 4
号: 12
開始ページ: 2183
終了ページ: 2196
URI: http://karn.lib.kagoshima-u.ac.jp/handle/123456789/19931




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