Sintering Behavior and Mechanical Properties of NiAl, Al2O3, and NiAl-Al2O3 Composites

被引：32
作者：
Chmielewski, M. [1 ]
Nosewicz, S. [2 ]
Pietrzak, K. [1 ,2 ]
Rojek, J. [2 ]
Strojny-Nedza, A. [1 ]
Mackiewicz, S. [2 ]
Dutkiewicz, J. [3 ]
机构：
[1] Inst Elect Mat Technol, Wolczynska 133, PL-01919 Warsaw, Poland
[2] Polish Acad Sci, Inst Fundamental Technol Res, PL-02106 Warsaw, Poland
[3] Inst Met & Mat Sci, PL-30058 Krakow, Poland
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2014年 / 23卷 / 11期
关键词：
ceramics; composites; electron; intermetallic; metallic matrix; microscopy; powder metallurgy; sintering; structural; MICROSTRUCTURE; EVOLUTION; ALUMINA; COPPER;
D O I：
10.1007/s11665-014-1189-z
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
It is commonly known that the properties of sintered materials are strongly related to technological conditions of the densification process. This paper shows the sintering behavior of a NiAl-Al2O3 composite, and its individual components sintered separately. Each kind of material was processed via the powder metallurgy route (hot pressing). The progress of sintering at different stages of the process was tested. Changes in the microstructure were examined using scanning and transmission electron microscopy. Metal-ceramics interface was clean and no additional phases were detected. Correlation between the microstructure, density, and mechanical properties of the sintered materials was analyzed. The values of elastic constants of NiAl/Al2O3 were close to intermetallic ones due to the volume content of the NiAl phase particularly at low densities, where small alumina particles had no impact on the composite's stiffness. The influence of the external pressure of 30 MPa seemed crucial for obtaining satisfactory stiffness for three kinds of the studied materials which were characterized by a high dense microstructure with a low number of isolated spherical pores.
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收藏
页码：3875 / 3886
页数：12
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