Phase equilibria and stability of the B2 phase in the Ni-Mn-Al and Co-Mn-Al systems

被引：40

作者：

Kainuma, R ^{[1
]}

Ise, M ^{[1
]}

Ishikawa, K ^{[1
]}

Ohnuma, I ^{[1
]}

Ishida, K ^{[1
]}

机构：

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

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1998年 / 269卷 / 1-2期

关键词：

bcc aluminides; Ni-Al base alloy; Co-Al base alloy; order-disorder transition; B2; phase; phase equilibrium; miscibility gap;

D O I：

10.1016/S0925-8388(98)00127-3

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 and ordering reactions in the composition region up to 50 at.% Al have been investigated in the Ni-Mn-Al and Co-Mn-Al systems at temperatures in the interval 850-1200 degrees C mainly by the diffusion couple method. The compositions of the gamma (Al: fcc-Ni, -Co, gamma-Mn), gamma' (Ll(2): Ni3Al), beta (B2: NiAl, CoAl, NiMn), beta-Mn (Al3: beta-Mn type), delta-Mn (A2: bcc-Mn) and epsilon (A3: hcp-(Mn, Al)) phases in equilibrium and the critical boundaries of the A2/B2 continuous ordering transition in the bcc phase region have been determined. It is shown that in the Mn-rich portion of the ternary systems both continuous and discontinuous A2 to B2 ordering transitions exist. The A2+B2 two-phase region in the isothermal sections has a lenticular shape and exists over a wide temperature range. The phase equilibria between the gamma, gamma', beta, beta-Mn, delta-Mn and epsilon phases are presented and the stability of the ordered bcc aluminides is discussed. (C) 1998 Elsevier Science S.A.

引用

页码：173 / 180

页数：8

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