New Functional Co-base Alloys-Phase stability and Its Industrial Applications

在实验测定和热力学评估的基础上，采用相图计算方法建立了钴基合金热力学数据库。利用该数据库设计了一种由γ‘Co3(Al，W)相L1_2化合物强化的新型钴基高温合金。所研制的变形钴基高温合金在800℃、10^5h的预期蠕变强度为100 MPa，铸造钴基高温合金已实际应用于搅拌摩擦焊刀具。结果表明，Co-W薄膜和Co基Heusler合金分别被用作磁记录介质和自旋电子器件。此外，通过对Co-Al基合金γ(Fcc)/β(B2)片层结构的微观组织控制，获得了制备药物洗脱支架的最佳成分和热处理条件。

Thermodynamic database on Co-base alloys has been constructed based on the experimental determinations and thermodynamic assessments by Calphad (Calculation of Phase Diagrams)approach. Using this database, a new type of Co-base superalloys strengthend by the L1_2 compound of γ' Co_3(Al, W)phase has been designed. The developed wrought Co-base superalloy shows the expected creep strength of 100MPa at 800 oC for 10^5 hours, while the cast Co-base superalloy has been applied to the FSW (Friction Stir Welding)tool for practical use. It is shown that the Co-W thin film and Co-based Heusler alloys are attracted for magnetic recording media and spin electronics, respectively. Furthermore, the optimum conditions for compositions and heat treatment to form porous structure on the surface to develop drug eluting stent have been obtained by microstructural control of γ (fcc)/β (B2)lamellar structure of Co-Al-based alloys.