4.7 Article

Microstructure investigation on magnetostrictive Fe100-xGax and (Fe100-xGax)99.8Tb0.2 alloys for 19 ≤ x ≤ 29

期刊

INTERMETALLICS
卷 115, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2019.106628

关键词

Functional alloys (magnetostrictive); Phase transformation; Microstructure; Diffraction (X-ray); Electron microscopy (TEM)

资金

  1. National Natural Science Foundations of China (NSFC) [51771010, 51331001]
  2. National Natural Science Foundations of China-Russian Foundations of Basic Research (NSFC-RFBR) [51811530098]
  3. Russian Foundation for Basic Research [18-58-53032]

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The microstructure and, in particular, the modified-D0(3) (m-D0(3)) nanoinclusions play an important role in the magnetostriction of binary Fe83Ga17 and Fe83Ga17Tb0.2 alloys. However, the structure evolution of nanoinclusions as well as their influence on the magnetostriction with the Ga contents larger that 19 at. % remain unclear. Here, the microstructure of Fe100-xGax and (Fe100-xGax)(99.8)Tb-0.2 as-cast alloys has been systematically investigated by X-ray diffraction and transmission electron microscopy for 19 <= x <= 29. Tetragonal m-D0(3), cubic D0(3) and B2 nanoinclusions with a size of similar to 2-8 nm are found to be dispersed in the A2 matrix in both Fe(100-x)Ga(x )and (Fe100-xGax)(99.8)Tb-0.2 alloys. The structure evolution of nanoinclusions in Fe100-xGax alloys with the increase of x is revealed: m-D0(3) (x = 19) -> m-D0(3)+D0(3) (x = 23) -> D0(3) + B2 (x = 27). While for (Fe100-xGax)(99.8)Tb-0.2 alloys the presence of m-D0(3) nanoinclusions extends to higher Ga contents (x = 27). The density of m-D0(3) nanoinclusions in Fe(100-x)Ga(x )and (Fe100-xGax)(99.8)Tb-0.2 alloys decreases with the increase of x, which leads to the lower magnetostriction in the alloys with x > 19. The relatively larger density of the m-D0(3) nanoinclusions can well explain the improvement in magnetostriction of Fe-Ga as-cast alloys for 19 <= x <= 29 with trace Tb doping.

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