自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 2    No. 1    June 1995

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STRUCTURE AND FORMATION MECHANISM OF DISLOCATION NETWORKS IN TiAl+
Qu Xuanhui; Huang Baiyun

Powder Metallurgy Research Institute, Central South University of Technology, Changsha, 410083, China

Abstract:The structure and characteristics of dislocation networks in Ti50 Al ordered alloy deformed at room temperature were studied by means of TEM diffraction contrast analysis technique. The results show that the observed dislocation networks consist of three types of dislocations with the Burgers vectors of 1/2 and 1/2 respectively. It is proposed that these networks are produced from the intersection of a group of ordinary dislocations on (111) plane with the superdislocations moving on the coupling plane,and at the intersection points dislocation nodes with are formed by dislocation reaction. In the networks, most of the dislocation segments are lying in the directions corresponding to their deep Peierls valleys due to the directional Ti-Ti covalent bonds and tend to be sessile, which is believed to be one of the factors responsible for the low-temperature brittleness of TiAl. In addition, the effects of alloying on the dislocation networks and ductility of TiAl alloy are also discussed.

 

Key words: ordered alloy; intermetallic compound; dislocation networks; TEM; ductility/TiAl;titanium aluminide

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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