Abstract:
The lattice parameters of the gamma iron as a function of chromium alloy content were determined using high temperature X-ray diffraction measurements for three Fe-rich alloys. The three concentrations were: (1) pure iron powder, (2) 1 at.% Cr, and (3) 1.8 at.% Cr, and the temperature range was between 800℃ to 1300℃. Linear relationships between lattice parameter and temperature were observed and determined in all three samples. The lattice parameters of the γ-phase of the three samples at room temperature were determined by extrapolating the high temperature data to 20℃. The values are (0.3572±0.0005) nm, (0.3604±0.0003) nm, and (0.3609±0.0003) nm for pure iron powder and iron-chromium powders with 1 at.% Cr and 1.8 at.% Cr, respectively. A linear least squares regression analysis yielded: 𝑎𝑎 = 0.0021( 𝑛𝑛𝑛𝑛 𝑎𝑎𝑎𝑎.%) × 𝐶𝐶𝐶𝐶𝐶𝐶 + 0.3575(𝑛𝑛𝑛𝑛).
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