Re-investigation of high-temperature phase equilibria in Fe-rich Sm–Fe–Ti alloys

Gabay, Alexander M.; Han, Chaoya; Ni, Chaoying; Hadjipanayis, George C.

doi:10.1016/j.jallcom.2023.169520

Title: Re-investigation of high-temperature phase equilibria in Fe-rich Sm–Fe–Ti alloys

Journal Article · 05 March 2023 · Journal of Alloys and Compounds

DOI: https://doi.org/10.1016/j.jallcom.2023.169520 · OSTI ID:1959686

^[1]; Han, Chaoya ^[1];

^[1]; Hadjipanayis, George C. ^[1]

Univ. of Delaware, Newark, DE (United States)

Recently renewed attempts to develop high-performance rare-earth-lean permanent magnets based on the Sm(Fe,Ti)₁₂ compound have drawn attention to the limited knowledge about the high-temperature phase equilibria in the Sm–Fe–Ti system. Experimental investigation of equilibrated alloys with electron probe microanalysis, X-ray diffraction and thermomagnetic analysis revealed several inaccuracies in the currently accepted phase relations at 1000°C and allowed for a revision of the Fe-rich corner of the Sm–Fe–Ti phase diagram. The Sm(Fe,Ti)₁₂ and Sm₃(Fe,Ti)₂₉ phases were found to have more extended Ti ranges of 5.1–9.7 at% and 2.8–6.9 at%, respectively. With increasing of the Ti content, the Curie temperature of the Sm(Fe,Ti)₁₂remains nearly constant at 306–312°C, whereas that of the Sm₃(Fe,Ti)₂₉ increases from 188°C to 207°C. The low-titanium Sm₃(Fe,Ti)₂₉phase equilibrates not only with the Sm(Fe,Ti)₁₂and Sm2(Fe,Ti)₁₇ phases, but also with (α-Fe) solid solution. Newly demonstrated equilibrium between Sm₂(Fe,Ti)₁₇ and TiFe₂ phases makes impossible the earlier reported equilibrium between the Sm₃(Fe,Ti)₂₉ and Sm(Fe,Ti)₁₁ phases. Because of an invariant reaction at 1000 °C, the revised phase diagram also features a class II four-phase equilibrium Sm₃(Fe,Ti)₂₉ + TiFe₂ + Sm(Fe,Ti)₁₂ + Sm₂(Fe,Ti)₁₇. Peritectic decomposition of the Sm(Fe,Ti)₁₁ phase, which occurs either at 1075°C or at 1087°C, was found to have among its products the Sm(Fe,Ti)₁₂ phase. Although no such equilibration was attempted, it must be possible to obtain above 1087°C a two-phase state composed of the Sm(Fe,Ti)₁₂ phase and a liquid – which is important for manufacturing of the Sm(Fe,Ti)₁₂- based permanent magnets via the liquid-phase sintering.

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Research Organization:: Univ. of Delaware, Newark, DE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0022168; DE SC0022168

OSTI ID:: 1959686

Alternate ID(s):: OSTI ID: 1960998

Journal Information:: Journal of Alloys and Compounds, Vol. 947; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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