Nanocrystalline matrix Al3Ni2-Al-Al3Ni composites produced by reactive hot-pressing of milled powders

被引：14

作者：

Krasnowski, Marek ^{[1
]}

Gierlotka, Stanislaw ^{[2
]}

Kulik, Tadeusz ^{[1
]}

机构：

[1] Warsaw Univ Technol, Fac Mat Sci & Engn, PL-02507 Warsaw, Poland

[2] Polish Acad Sci, Inst High Pressure Phys, PL-01142 Warsaw, Poland

来源：

INTERMETALLICS | 2014年 / 54卷

关键词：

Nanocrystalline metals; Nanocrystalline structure; Intermetallics; Mechanical alloying and milling; Powder metallurgy; MECHANICAL-PROPERTIES; NICKEL ALUMINIDES; CONSOLIDATION; INTERMETALLICS; METALS; ALLOY; AL;

D O I：

10.1016/j.intermet.2014.06.012

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Mechanically alloyed nanocrystalline Al63Ni37 powder with a metastable structure of NiAl intermetallic phase was mixed with 30 vol.% of Al powder. This powder mixture was consolidated under the pressure of 7.7 GPa at 600, 700, 800 and 1000 degrees C for 15 and 180 s. During the consolidation, in all cases, the metastable NiAl phase transformed into the equilibrium Al3Ni2 intermetallic. Moreover, a solid-state reaction between the intermetallic matrix and Al occurred, yielding an Al3Ni phase. Progress of this reaction depended on the consolidation temperature and temperature exposure time, thus Al3Ni2-Al, Al3Ni2-Al-Al3Ni or Al3Ni2-Al3Ni composites were produced by hot-pressing with various parameters. The mean crystallite size of the Al3Ni2 intermetallic matrix in the composites is 39-67 nm, depending on consolidation parameters. The composites hardness is in the range of 6.02-7.51 GPa. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：193 / 198

页数：6

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