论文部分内容阅读
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Fe_3C;在800℃时,Fe_3C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。
In this work, the phase transition of ε phase obtained by liquid quenching in Fe-C-Sb alloy under high pressure was studied by X-ray powder photography. The experimental results show that the pressure has a significant effect on the stability of the ε phase and its phase transformation process. Under the pressure of 4.7GPa, the stabilization temperature of εphase increases to about 450 ℃, and then the new orthorhombic phase of orthorhombic structure that does not appear under normal pressure begins to appear in the alloy. Under the above pressure, when the temperature reaches 560 ℃, the orthorhombic phase begins to transform into Fe_3C; At 800 ℃, Fe_3C decomposes into single-state graphite carbon and γ-Fe, the phase composition of the alloy is: C, γ-Fe, Sb and another unknown phase.