EQUILIBRIA AND MICROSTRUCTURAL EVOLUTION IN THE BETA/BETA'GAMMA' REGION OF THE NI-AL-TI SYSTEM - MODELING AND EXPERIMENT

被引：22

作者：

YANG, R ^{[1
]}

SAUNDERS, N ^{[1
]}

LEAKE, JA ^{[1
]}

CAHN, RW ^{[1
]}

机构：

[1] UNIV SURREY, DEPT MAT SCI & ENGN, GUILDFORD GU2 5XH, SURREY, ENGLAND

来源：

ACTA METALLURGICA ET MATERIALIA | 1992年 / 40卷 / 07期

关键词：

D O I：

10.1016/0956-7151(92)90098-Y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

As part of a comprehensive study of 3-phase alloys in the Ni-Al-Ti system incorporating the beta (B2, NiAl type), beta' (L2(1), Ni2AlTi type) and gamma' (L1(2), Ni3Al type) phases, the phase equilibria for this part of the ternary diagram were modelled by CALPHAD methods. The approach used and the results obtained are presented, and compared with an experimental determination by analytical electron microscopy of the 3-phase equilibrium triangle at 900-degrees-C. The calculated/experimental 3-phase triangle differs significantly from earlier estimates. The theoretical model is also used to predict phase formation sequences for several alloys in the 3-phase triangle and these are critically compared with observed microstructures. An unusual graded antiphase domain structure seen in one alloy is interpreted.

引用

页码：1553 / 1562

页数：10