Paper Title:
The Stability of γ ’-Co3(Al,W) Phase in Co-Al-W Ternary System
  Abstract

The thermodynamic stability ’- Co3(Al,W) phase (L12) in the Co-Al-W ternary system at 900 °C was investigated through microstructure and EPMA analysis on a heat-treated bulk alloy. To promote microstructural evolution, the bulk alloy was cold rolled before heat treatment. By heating at 900 °C, the ’ phase was formed discontinuously in contact with the -Co (A1) phase. With increasing heat treatment time, however, the fraction of ’ phase decreased while that of , CoAl (B2) and Co3W (D019) phases increased. These results are consistent with our previous work with a diffusion-couple method, indicating that the ’ phase is metastable, and the three phases of, CoAl and Co3W are thermodynamically stable at 900 °C.

  Info
Periodical
Materials Science Forum (Volumes 654-656)
Main Theme
Edited by
Jian-Feng Nie and Allan Morton
Pages
448-451
DOI
10.4028/www.scientific.net/MSF.654-656.448
Citation
Y. Tsukamoto, S. Kobayashi, T. Takasugi, "The Stability of γ ’-Co3(Al,W) Phase in Co-Al-W Ternary System", Materials Science Forum, Vols. 654-656, pp. 448-451, 2010
Online since
June 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Weichao Zheng, Xiao Li Sun, Peijie Li, Daben Zeng, L.B. Ber
Abstract:Effect of heat treatment on the microstructure and mechanical properties of high purity MA2-1(Mg-5wt.%Al-1wt.%Zn-0.4wt.%Mn) alloy sheet were...
151
Authors: Ling Gang Meng, Can Feng Fang, Peng Peng, Nai Pu Li, Qiong Zhu, Xing Guo Zhang
Chapter 5: Metal-Matrix Composites
Abstract:Microstructure evolution of Mg-5Gd-2Y-2Zn-0.5Zr alloy during high temperature heat-treatment at 500°C in the time range 10-70h was...
1384
Authors: Jun Xie, Su Gui Tian, Guang Liang Xie, Xiao Ming Zhou
Chapter 10: Metal
Abstract:By means of different cooling methods, microstructure observation and X-ray diffraction analysis, an investigation has been made into the...
984
Authors: Qiang Zeng, Ping Yan, Jing Chen Zhao, Long Fei Zhang, Lian Li
Abstract:A long term aging treatment at 900oC for 3000h was carried out on a conventional cast nickel base superalloy with standard...
452