The composite microstructures' effect on the mechanical properties of Ni-25Al-xFe intermetallics

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Title:	The composite microstructures' effect on the mechanical properties of Ni-25Al-xFe intermetallics
Authors:	Tsau CH Yeh JW
Contributors:	材料所
Keywords:	intermetallic nickel alloys casting microstructure mechanical properties
Date:	2001
Issue Date:	2009-12-14 11:01:27 (UTC+8)
Abstract:	The present work investigated the microstructural evolution and mechanical properties of ternary Ni-25Al-xFe alloys, which are the NiAl system macroalloyed with iron. The aim is to get an understanding of the relationship between the microstructures and the mechanical properties. The results reveal that the suitable additions of Fe can change the NiAl from a single beta'-phase granular structure to a multi-phase dendritic one. The alloys with such a microstructure could possess better mechanical properties because of the main plastic deformation was supported by the softer gamma phase in the interdendritic regions. In this Ni-25Al-xFe alloy system, the chemical compositions of the alloys influenced the morphologies of the interdendrites, and therefore strongly affected on the hardness and tensile properties. Thus, to control the microstructure, it is very important to get a Ni-Al-Fe intermetallic alloy with a better combination of mechanical properties. In addition, the variation of the room-temperature tensile properties could be explained by the concept of plastic zone size influenced on the state of stress. (C) 2001 Elsevier Science B.V. All rights reserved.
Relation:	MATERIALS CHEMISTRY AND PHYSICS Volume: 68 Issue: 1-3 Pages: 142-148
Appears in Collections:	[Department of Chemical & Materials Engineering] journal articles

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