Thermodynamic Description of the γ Phase in the Co-Al-W Based Superalloys

摘要：

　　The phase equilibrium and the precipitation behavior of the γ phase in the Co-Al-W-Ni-Cr superalloys were studied by thermodynamic method.The phase equilibrium of the Co-Al-W-15Ni-5Cr alloy at 900 ℃ was calculated,and it was found that there were a γ single-phase region and a γ+γ two-phase region.The effects of Al/W ratio on the precipitation of the γ phase were studied,and it was clear that higher mole fraction of the γ phase can be obtained with the Al/W ratio of 2.5.The stability of the γ phase can be improved by adding of Ni,as well as the servicing temperature of the Co-Al-W based superalloys.The results obtained in this work can be used for the developing of the new-type Co-based superalloys.

关键词： Phase diagram:Thermodynamic calculation:CALPHAD:Alloy design:Co-Al-W based superalloys

作者: Shuyu Yang Min Jiang Lei Wang

作者单位: School of Mechanical Engineering, Shenyang University, China The Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Northeastern Unive

会议类型: 国际会议

会议名称: the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))

会议地点: 太原

会议语种:英文

页码: 654-658

在线出版日期: 2012-07-13（万方平台首次上网日期，不代表论文的发表时间）