Low-temperature superplasticity in ultrafine-grained Ti5Si3-TiAl composites

被引：28
作者：
Klassen, Thomas [1 ]
Suryanarayana, C. [2 ]
Bormann, Ruediger [3 ]
机构：
[1] Helmut Schmidt Univ, Inst Mat Technol, D-22043 Hamburg, Germany
[2] Univ Cent Florida, Dept Mech Mat & Aerosp Engn, Orlando, FL 32816 USA
[3] Inst Mat Res, GKSS Res Ctr Geesthacht GmbH, D-21502 Geesthacht, Germany
来源：
SCRIPTA MATERIALIA | 2008年 / 59卷 / 04期
关键词：
mechanical alloying; ceramic-intermetallic composite; transmission electron microscopy (TEM); tension test; superplasticity;
D O I：
10.1016/j.scriptamat.2008.04.029
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A ceramic-intermetallic composite of Ti5Si3 With 40 vol.% TiAl was synthesized by mechanical alloying and hot isostatic pressing. The microstructure consisted of equiaxed grains of gamma-TiAl and zeta-Ti5Si3 with a size of about 400 nm. This composite exhibited a tensile elongation of 150% at 950 degrees C, using a strain rate of 4 x 10(-5) s(-1). This temperature for superplastic deformation is just about 0.5 T-m, the lowest normalized superplastic temperature reported for any ceramic-based material. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：455 / 458
页数：4
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