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Formation of Al-Ni Intermetallic Layers Lining Microchannels Produced by Powder-Metallurgical Process Using Aluminum Sacrificial Cores

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/74703

Title: Formation of Al-Ni Intermetallic Layers Lining Microchannels Produced by Powder-Metallurgical Process Using Aluminum Sacrificial Cores
Authors: Ohmi, Tatsuya Browse this author →KAKEN DB
Hayashi, Naoya Browse this author
Keywords: microchannel device
microchannel heat exchanger
microreactor lining
microporous structure
intermetallic compound
nickel aluminide
powder metallurgy
unequal diffusion rates
Kirkendall voids
Issue Date: 1-Oct-2016
Publisher: The Japan Institute of Metals and Materials
Journal Title: MATERIALS TRANSACTIONS
Volume: 57
Issue: 10
Start Page: 1816
End Page: 1822
Publisher DOI: 10.2320/matertrans.M2016206
Abstract: The mechanism of in-situ formation of Al-Ni intermetallic lining layers during microchannel formation in nickel bodies by a powder-metallurgical process has been investigated. Aluminum wire was used as a sacrificial core that gives the shape of the microchannel and supplies the alloying element for the lining layer. Nickel powder compacts with 29(±1)% porosity containing aluminum wires were heated from room temperature and then quenched at various temperatures between 873 K and 1473 K. Porous intermetallic lining layers were clearly recognized at temperatures above 1073 K. Each lining layer was built up from an outward-growing layer and an inward-growing layer. Change in the voidage in the outward-growing layer during heat treatment and the formation of a high-voidage zone around the lining layer were accounted for in terms of phase equilibria and unequal diffusion rates of the alloy elements in the Al-Ni intermetallic compounds and nickel solid solution.
Relation: https://www.jstage.jst.go.jp/article/matertrans/57/10/57_M2016206/_article
Type: article
URI: http://hdl.handle.net/2115/74703
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大参 達也

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