Nanometer-scaled lamellar microstructures in Ti-45Al-7.5Nb-(0;0.5)C alloys and their influence on hardness

被引：68

作者：

Cha, Limei ^{[1
]}

Scheu, Christina ^{[1
]}

Clemens, Helmut ^{[1
]}

Chladil, Harald F. ^{[1
]}

Dehm, Gerhard ^{[2
,3
]}

Gerling, Rainer ^{[4
]}

Bartels, Arno ^{[5
]}

机构：

[1] Motanuniv Leoben, Dept Phys Met & Mat Testing, A-8700 Leoben, Austria

[2] Austrian Acad Sci, Erich Schmid Inst Mat Sci, A-8700 Leoben, Austria

[3] Univ Leoben, Dept Mat Phys, A-8700 Leoben, Austria

[4] GKSS Forschungszentrum Geesthacht GmbH, Inst Mat Res, D-21502 Geesthacht, Germany

[5] Tech Univ Hamburg, Dept Mat Sci & Technol, D-21073 Hamburg, Germany

来源：

INTERMETALLICS | 2008年 / 16卷 / 07期

关键词：

titanium aluminides; based on TiAl; solid-solution hardening; heat treatment; microstructure; electron microscopy; transmission;

D O I：

10.1016/j.intermet.2008.03.009

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：

In this study, nanometer-scaled lamellar microstructures were adjusted in Ti-45Al-7.5Nb-(0; 0.5C) alloys (in at.%) and analyzed by means of transmission electron microscopy. Different annealing temperatures subsequent to quenching were used to obtain well-defined lamellar microstructures with ultrafine widths of a few tens of nanometers to a few nanometers. Surprisingly, the hardness of these alloys is enhanced by increasing the volume fraction of gamma-TiAl laths. This behavior is different from the results reported in literature and can be explained by the occurrence of a size effect. The nanometer-size gamma laths became harder than the of alpha(2)-Ti3Al laths which are 10 times wider. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：868 / 875

页数：8

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