Slip geometry of dislocations related to cutting of the γ′ phase in a new generation single-crystal superalloy

被引：161

作者：

Zhang, JX ^{[1
]}

Murakumo, T ^{[1
]}

Koizumi, Y ^{[1
]}

Kobayashi, T ^{[1
]}

Harada, H ^{[1
]}

机构：

[1] Natl Inst Mat Sci, High Temp Mat Project 21, Tsukuba, Ibaraki 3050047, Japan

来源：

ACTA MATERIALIA | 2003年 / 51卷 / 17期

关键词：

superalloys; Ru addition; creep test; transmission electron microscopy (TEM); dislocation structure;

D O I：

10.1016/S1359-6454(03)00355-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The superdislocations in the gamma' phase of a fourth-generation single-crystal TMS-138 superalloy have been characterized after creep rupture at a stress of 137 MPa under different temperatures. The number of slip dislocations increases with the increase of creep temperatures from 1100 to 1150 degreesC. The dominant cutting mode of the gamma' phase is dislocation pairs coupled by an antiphase boundary (APB). The popular superdislocations in the gamma' phase show screw character with Burgers vectors <0 1 1> or <1 0 1>. Also, observed in the gamma' phase are 60degrees or screw superdislocations in either [1 1 0] or [1 1 0] directions, and [0 0 1] edge superdislocations. Stacking faults are seen from the dissociation of superdislocations. These superdislocations are related to the damage of the rafted structure in the superalloy. (C) 2003 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：5073 / 5081

页数：9

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