Phase equilibria and stability of the B2 phase in the Ni–Mn–Al and Co–Mn–Al systems
Phase equilibria and stability of the B2 phase in the Ni–Mn–Al and Co–Mn–Al systems
复制标题
Ni-Mn-Al 和 Co-Mn-Al 体系中 B2 相的相平衡和稳定性
DOI：
10.1016/s0925-8388(98)00127-3
复制
发表时间：
1998
影响因子：
6.2
通讯作者：
K. Ishida
中科院分区：
文献类型：
--
作者：
R. Kainuma;M. Ise;K. Ishikawa;I. Ohnuma;K. Ishida
在50 at范围内的相平衡和有序反应。本文主要采用扩散偶法在850 ~ 1200℃范围内研究了Ni-Mn-Al和Co-Mn-Al体系中的% Al。确定了平衡态γ (A1: fcc-Ni, - co, γ-Mn)、γ′（L12: Ni3Al）、β (B2: NiAl, CoAl, NiMn)、β-Mn （A13: β-Mn型）、δ-Mn （A2: bcc-Mn）和ε (A3: hcp-(Mn, Al))相的组成以及bcc相区A2/B2连续有序转变的临界边界。结果表明，在富mn三元体系中存在连续和不连续的A2 - B2序跃迁。等温截面上A2+B2两相区呈透镜状，存在温度范围广。给出了γ、γ′、β、β- mn、δ-Mn和ε相之间的相平衡，并讨论了有序bcc铝化物的稳定性。
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°C mainly by the diffusion couple method. The compositions of the γ (A1: fcc-Ni, -Co, γ-Mn), γ′ (L12: Ni3Al), β (B2: NiAl, CoAl, NiMn), β-Mn (A13: β-Mn type), δ-Mn (A2: bcc-Mn) and ε (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 γ, γ′, β, β-Mn, δ-Mn and ε phases are presented and the stability of the ordered bcc aluminides is discussed.