Microstructure dependence of strength of Ir-base refractory superalloys

被引：60

作者：

Yamabe-Mitari, Y

Ro, Y

Maruko, T

Harada, H

机构：

[1] Natl Res Inst Met, Tsukuba, Ibaraki 305, Japan

[2] Furuya Met Co Ltd, Ibaraki, Osaka 308, Japan

来源：

INTERMETALLICS | 1999年 / 7卷 / 01期

关键词：

multiphase intermetallics; precipitates; mechanical properties at high temperatures; microstructure; electron microscopy; transmission;

D O I：

10.1016/S0966-9795(98)00010-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Precipitation hardening was investigated in Ir-Nb and Ir-Zr alloys with a two-phase structure consisting of the fee matrix and Ll(2) coherent precipitate phases, similar to that in Ni-base superalloys. Cuboidal Ll(2) precipitates and plate-like Ll(2) precipitates were formed with coherent interfaces in the fee matrix in the Ir-Nb and Ir-Zr alloys, respectively. Effects of precipitate shape and coherency strains on precipitation hardening are discussed in terms of lattice misfit. Plate-like precipitates forming a 3-dimensional maze structure in the Ir-Zr alloys were profitable to precipitation hardening in both factors, that is precipitate shape and coherency strains. (C) 1998 Elsevier Science Ltd. Air rights reserved.

引用

页码：49 / 58

页数：10

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