Melting Point of Pure Cr and Phase Equilibria in the Cr-Si Binary System
Melting Point of Pure Cr and Phase Equilibria in the Cr-Si Binary System
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DOI：
10.1007/s11669-022-00954-9
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发表时间：
2022-05-01
影响因子：
1.4
通讯作者：
Kainuma, Ryosuke
中科院分区：
文献类型：
--
作者：
Ioroi, Kazushige;Aono, Yuki;Kainuma, Ryosuke
用差示扫描量热仪（DSC）和差热分析仪（DTA）测定了纯Cr的熔点和Cr-Si二元系的相平衡。此外，使用电子探针显微分析仪（EPMA）分析了两相合金的成分。在高频感应加热炉中进行1500 ℃以上的热处理，其中温度通过双色高温计以+/-20 ℃的精度估计。考虑到O和N杂质，纯Cr的熔点被确定为1861 +/-3 ° C。在整个成分范围内测定了Cr-Si系相图。确定了与Cr 3Si和Cr 5Si 3相形成有关的恒定反应为液态Cr 3Si + Cr 5Si 3的共晶反应。Cr 3Si相的溶解度范围在化学计量组成的富Cr侧，而Cr 5Si 3相的溶解度范围向富Si侧延伸。利用X射线衍射分析发现，α-Cr 5Si 3/β-Cr 5Si 3相变不存在。
The melting point of pure Cr and phase equilibria in the Cr-Si binary system were determined by thermal analysis using a differential scanning calorimeter (DSC) and differential thermal analyzer (DTA). In addition, the composition of two-phase alloys was analyzed using an electron probe microanalyzer (EPMA). Heat treatment above 1500 degrees C was conducted in a high-frequency induction heating furnace, where the temperature was estimated by a two-color pyrometer with an accuracy of +/- 20 degrees C. The melting point of pure Cr was determined to be 1861 +/- 3 degrees C, considering the O and N impurities. The phase diagram of the Cr-Si system was determined in the whole composition range. The invariant reaction related to the formation of Cr3Si and Cr5Si3 phases was confirmed as the eutectic reaction of liquid Cr3Si + Cr5Si3. The solubility range of Cr3Si phase is on the Cr-rich side from the stoichiometric composition, whereas the solubility range of Cr5Si3 phase extends toward the Si-rich side. We found using the x-ray diffraction that the alpha-Cr5Si3/beta-Cr5Si3 transformation does not exist.