【摘要】 本工作用X射线粉末照相法研究了Fe-C-Sb合金中液态急冷获得的ε相在高压下的相变过程。实验结果表明,压力对ε相的稳定性及其相变过程都有显著影响。在4.7GPa压力下,ε相的稳定化温度提高到450℃左右,而后合金中开始出现在常压下未曾出现过的新的正交结构亚稳相。在上述压力下,当温度达到560℃时,该正交结构亚稳相开始转变成Fe₃C;在800℃时,Fe₃C分解成单质状态的石墨碳和γ-Fe,这时合金的相组成为:C,γ-Fe,Sb及另一未知相。更多还原

【Abstract】 Pressure effect on the phase transformation process of the e-phase of splat quenching Pe-C-Sb alloy has been investigated by using X-ray powder photography. The experimental results show that high pressure will not only increase the stability of the e-phase remarkably but also change its phase transformation process. At 4.7 GPa, as the temperature of stability of e-phase increases to 450℃, a new metastable phase of orthorhombic structure, being absent at normal pressure, will appear. By raising annealing temperature to 560℃, the orthorhombic metastable phase begins to transform into Fe3C which will decompose into carbon (graphite) and γ-Fe on further increasing annealing temperature to 800℃. At this time, the alloy is composed of C (graphite), γ-Fe, Sb and another unknown phase.更多还原