Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7999272 | Journal of Alloys and Compounds | 2015 | 5 Pages |
Abstract
The thermal expansion of Fe-carbides Fe7C3 and Fe3C was measured above and below the ferromagnetic transition in a temperature range of 297-911 K by in situ X-ray diffraction enhanced by synchrotron radiation. The coefficient of thermal expansion was estimated as α = a0 + a1T. The results for paramagnetic phases are a0 = 3.1 Ã 10â5 Kâ1 and a1 = 1.2 Ã 10â8 Kâ2 for Fe7C3 and a0 = 3.9 Ã 10â5 Kâ1 and a1 = 1.2 Ã 10â8 Kâ2 for Fe3C. The ferromagnetic phases show linear relations with V298K = 371.9 Ã
3, a0Â =Â 0.91Â ÃÂ 10â5Â Kâ1 and a1Â =Â 0 for Fe7C3 and V298KÂ =Â 155.2Â Ã
3, a = 0.86 Ã 10â5 Kâ1 and a1 = 0 for Fe3C. Our obtained results indicate that the coefficients of thermal expansion, that were calculated by high-pressure equations of state for Fe-carbides, appeared to be high-precision and consistent with the data obtained at 0.1 MPa.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Konstantin D. Litasov, Sergey V. Rashchenko, Alexander N. Shmakov, Yury N. Palyanov, Alexander G. Sokol,