Metallurgy of the magnetic τ-phase in Mn-Al and Mn-Al-C

被引：0

作者：

Mueller, Christiane ^{[1
]}

Stadelmaier, Hans H. ^{[1
]}

Reinsch, Bernd ^{[1
]}

Petzow, Guenter ^{[1
]}

机构：

[1] Max-Planck-Inst fuer Metallforschung, Stuttgart, Germany

来源：

Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques | 1996年 / 87卷 / 07期

关键词：

Equilibrium phase - Magnetic tau phase - Metastability - Metastable eutectoid reaction - Metastable tau forms - Off stoichiometric composition - Undercooling;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The known information on Mn-Al(-C) permanent magnets that has accumulated since 1958 is reviewed critically and combined with new measurements to provide a definitive description of the metastability and the conditions of formation of tetragonal τ-Mn1.1Al0.9 and its decomposition into the equilibrium phases. Metastable τ forms readily because its high-temperature precursor, close-packed hexagonal Ε, is readily undercooled well below its equilibrium eutectoid decomposition temperature as a result of the delayed nucleation of the stable β-Mn solid solution. The off-stoichiometric composition of binary τ is connected with the composition, 55 at.% Mn, of the metastable eutectoid reaction Ε &rarr γ2 + β, where the maximum undercooling of Ε is achieved and second phases are absent.

引用

页码：594 / 597