Three-dimensional study of Ni aluminides in an AlSi12 alloy by means of light optical and synchrotron microtomography

被引：98
作者：
Asghar, Z. [1 ]
Requena, G. [1 ]
Degischer, H. P. [1 ]
Cloetens, P. [2 ]
机构：
[1] Vienna Univ Technol, Inst Mat Sci & Technol, A-1040 Vienna, Austria
[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France
来源：
ACTA MATERIALIA | 2009年 / 57卷 / 14期
关键词：
3D X-ray microscopy; Synchrotron radiation; Ni aluminides; Aluminium alloys; 3D light optical tomography; AL-SI ALLOYS; MECHANICAL-PROPERTIES; MICROSTRUCTURE; TOMOGRAPHY; EUTECTICS; EVOLUTION; CREEP; FE;
D O I：
10.1016/j.actamat.2009.05.010
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The three-dimensional (3D) microstructure of an AlSi12Ni alloy in as-cast and in solution-treated conditions is characterized by light optical and synchrotron tomography. Eutectic AI-Si alloys containing I wt.% Ni in as-cast condition present networks of connected Si lamellae as well as complex 3D shapes of Ni-containing aluminides. The eutectic Si networks disintegrate during solution treatment in the binary AI-Si alloy while they remain connected in the Al-Si-Ni alloy. The contiguity between eutectic Si and Ni-containing aluminides is maintained, when the alloy is solution treated at 540 degrees C for 24 h. The sphericity of the aluminides is only slightly increased by the solution treatment. The reinforcing role of eutectic Si together with the Ni-containing aluminides is governed by a stable interconnectivity and contiguity of these rigid phases accumulating similar to 20 vol.%. The 3D data obtained by synchrotron tomography quantify connectivity, shape and volume fraction of eutectic Si and aluminides, whereas their contiguity is verified by light optical sectioning tomography. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：4125 / 4132
页数：8
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