Creep and directional coarsening in single crystals of new γ-γ′ cobalt-base alloys

被引：139

作者：

Titus, Michael S. ^{[1
]}

Suzuki, Akane ^{[2
]}

Pollock, Tresa M. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[2] GE Global Res, Niskayuna, NY 12309 USA

来源：

SCRIPTA MATERIALIA | 2012年 / 66卷 / 08期

基金：

美国国家科学基金会;

关键词：

Cobalt alloys; Intermetallic compounds; Creep; Coarsening; Directional solidification; HIGH-TEMPERATURE ALLOYS; SUPERALLOYS; DEFORMATION;

D O I：

10.1016/j.scriptamat.2012.01.008

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Single crystal tensile creep tests have been performed on L1(2)-containing cobalt-based alloys loaded along the [001] orientation. Co-Al-W alloys with additions of Ni, Ta, Cr and Mo were crept at 900 degrees C. Four of five alloys investigated exhibited directional coarsening parallel to the applied stress, indicating a positive misfit between the gamma and gamma' phases. Alloys containing a high volume fraction of gamma' exhibited superior creep properties compared to alloys with low volume fraction of precipitates. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：574 / 577

页数：4

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