【摘要】 通过扫描电子显微镜和能谱仪（SEM-EDS）以及X射线衍射仪（XRD）对平衡合金进行分析,测定Co-Mo-Si三元系富钴角1 000℃的相关系;结合相消失法,实验确定Co-Mo-Cr-Si四元系70%Co（摩尔分数）的1 000℃等温截面。结果表明:在1 000℃时,Co-Mo-Si三元系富钴角存在3个三相区,富钴相均和Co Mo Si相平衡;在Co-Mo-Cr-Si四元系70%Co的等温截面中存在一个成分范围很宽的（Co）+Co₃Mo₂Si两相区,还有一个（Co）+Co₃Mo+Co₇Mo₆+Co₃Mo₂Si四相区。和800℃等温截面相比,（Co）+Co₃Mo₂Si两相区明显增大。Cr在（Co）、αCo₂Si、Co₃Mo、Co₇Mo₆和Co₃Mo₂Si中的最大溶解度（摩尔分数）分别为25.5%,3.8%,1.5%、9.9%和16.7%,Si在（Co）、Co₃Mo和Co₇Mo₆中的最大溶解度（摩尔分数）分别为17.8%,0.3%和2.6%。更多还原

【Abstract】 The phase relation of the Co-Mo-Si ternary system at 1 000 ℃ was studied based on the experimental results of equilibrated alloy, using SEM-EDS and XRD. The 1 000 ℃ isothermal section of the Co-Mo-Cr-Si quaternary system with Co fixed at 70%（mole fraction） was investigated coupled with the phase-disappeared method. The experimental results show that three three-phase regions exist in the cobalt-rich corner of the 1 000 ℃ isothermal section of the Co-Mo-Si ternary system, all of the cobalt-rich phases can be equilibrated with Co Mo Si phase. In the isothermal section of the Co-Mo-Cr-Si quaternary system with Co fixed at 70%（mole fraction） at 1 000 ℃, there is a wide（Co）+Co₃Mo₂Si phase field, and one four-phase region consisting of（Co）+Co₃Mo+Co₇Mo₆+Co₃Mo₂Si. Compared with the 800 ℃isothermal section, the（Co）+Co₃Mo₂Si phase field becomes widen obviously. The maximum solubility（mole fraction） of Cr in（Co）, αCo₂Si, Co₃ Mo, Co₇Mo₆ and Co₃Mo₂ Si phase is 25.5%, 3.8%, 1.5%, 9.9% and 16.7%, respectively, and that of Si in（Co）, Co₃ Mo and Co₇Mo₆ phase is 17.8%, 0.3% and 2.6%, respectively.更多还原