COHERENT PRECIPITATES IN THE BCC ORTHORHOMBIC 2-PHASE FIELD OF THE TI-AL-NB SYSTEM

被引：88

作者：

BENDERSKY, LA

BOETTINGER, WJ

ROYTBURD, A

机构：

[1] Metallurgy Division, National Institute of Standards and Technology, Gaithersburg

来源：

ACTA METALLURGICA ET MATERIALIA | 1991年 / 39卷 / 08期

关键词：

D O I：

10.1016/0956-7151(91)90165-W

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Alloys of composition Ti2AlNb and Ti4AlNb3, cooled from 1400-degrees-C and equilibrated at 700-degrees-C for 26 days, were both found to consist of two phases: the Ti- and Nb-rich b.c.c. phase and the orthorhombic phase based on Ti2AlNb. Depending on the alloy composition, each phase was observed as a precipitate with a plate morphology in the matrix of the other phase. In both cases the phases share a common direction, [011]b.c.c. parallel-to [001]ort, and interface (habit) plane, (211BAR)b.c.c. parallel-to (110BAR)ort. Geometrical patterns of plates of the different orientational variants were also observed. Analysis of the orientation relation, habit plane and plate patterns are consistent with the concept of a strain-type transition even though long range diffusion is required.

引用

页码：1959 / 1969

页数：11