Effect of chemical ordering on the deformation mode of Al-rich Ti-Al single crystals

被引：48

作者：

Nakano, T

Matsumoto, K

Seno, T

Oma, K

Umakoshi, Y

机构：

[1] Department of Materials Science and Engineering, Faculty of Engineering, Osaka University, Osaka

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1996年 / 74卷 / 01期

关键词：

D O I：

10.1080/01418619608239700

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of the Al concentration on the ordered structure and plastic behaviour of Al-rich Ti-Al alloys was investigated using single crystals of Ti-54.7 at.% Al and Ti-58.0 at.% Al. Short-range and long-range orders with an Al5Ti3-type superstructure based on the L1(0) ordered structure were observed in the as-grown Ti-54.7 at.% Al and Ti-58.0 at.%Al crystals respectively. After annealing at 500 degrees C the superstructure developed markedly in both crystals. The chemical ordering strongly affected the yield stress, fracture strain and work-hardening rate through the change in the deformation mode. The increase in Al concentration suppressed activation of (a/2)[<(1)over bar10>]-type ordinary dislocations since an antiphase boundary (APE) was created in the Al5Ti3-type superstructure behind moving dislocations. Since the APB was created by the motion of a[10(1) over bar] superlattice dislocations but its energy is lower than that related to ordinary dislocations, ordinary dislocations are more immobilized than superlattice dislocations.

引用

页码：251 / 268

页数：18

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