Partition behavior of alloying elements and phase transformation temperatures in Co-Al-W-base quaternary systems

被引：218

作者：

Omori, Toshihiro ^{[1
]}

Oikawa, Katsunari ^{[1
]}

Sato, Jun ^{[1
]}

Ohnuma, Ikuo ^{[1
]}

Kattner, Ursula R. ^{[2
]}

Kainuma, Ryosuke ^{[1
]}

Ishida, Kiyohito ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

[2] NIST, Div Met, Gaithersburg, MD 20899 USA

来源：

INTERMETALLICS | 2013年 / 32卷

基金：

日本学术振兴会;

关键词：

Intermetallics; miscellaneous; Phase diagrams; Alloy design; Phase stability; prediction; ab initio calculations; EQUILIBRIA;

D O I：

10.1016/j.intermet.2012.07.033

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：

The phase equilibria among gamma (Al), gamma' (L1(2)), chi (D0(19)), beta (B2) and mu (D8(5)) phases and the gamma' solvus and gamma solidus temperatures were investigated in the Co-Al-W-based quaternary systems with alloying elements of Ti, V, Nb, Ta, Cr, Mo, Mn, Fe, Ni, Si, Zr, Hf, Ru and Ir by electron probe microanalysis (EPMA) using multiphase alloys and by differential scanning calorimetry (DSC). It was found that Ta, Nb, Ti, V. Mo and W are partitioned to the gamma' or chi phase rather than to the gamma phase, while Cr, Mn and Fe tend to be distributed to the gamma phase. The correlation between the partition coefficient of alloying elements between gamma/gamma', gamma/chi and gamma/beta phases and ab initio formation energy of Co3X (L1(2)), Co3X (D0(19)) and CoX (B2) was respectively obtained. It was also found that the gamma' solvus temperature increases by the addition of the gamma' former elements such as Ta, Nb and Ti, which decreases the gamma solidus temperature. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：274 / 283

页数：10

共 31 条

[1] Microstructure and creep strength of different γ/γ′-strengthened Co-base superalloy variants [J].