Improvement of fatigue resistance in fiber-reinforced metal matrix composite by control of interphase layr

为了提高碳化硅纤维增强Ti-15-3合金复合材料的疲劳性能，提出了一种新的界面层。采用PVD工艺在碳化硅(SCS-6)纤维表面沉积了铜/钼和铜/钨双金属涂层。采用热等静压工艺将纤维复合到Ti-15-3合金中。研究了非缺口复合材料的疲劳性能及双层金属涂层对界面力学性能的影响。结果表明，与原有的碳化硅纤维增强的Ti-15-3复合材料相比，复合金属涂层提高了复合材料的抗疲劳性能。通过双层金属涂层的加入，防止了SCS涂层与碳化硅纤维的脱粘，从而改善了碳化硅纤维的性能。实验证明，双金属界面层对提高碳化硅纤维增强Ti-15-3复合材料的抗疲劳性能是有效的。

To improve fatigue resistance of SiC fiber-reinforced Ti-15-3 alloy composite, anew interphase layr has been proposed. Duplex metal coatings, Cu/Mo and Cu/W,were deposited on SiC (SCS-6) fiber by PVD process. The fibers were incorporated into Ti-15-3 alloy matrix by HIP process. Fatigue resistance of the un-notched composite and effect of the duplex metal coating on interface mechanical properties were studied. It was found that the duplex metal coatings improved fatigue resistance compared with original SiC fiber-reinforced Ti-15-3 composite. The improvement was achieved by preventing the debonding of SCS coating layr from the SiC fiber by the incorporation of duplex metal coating. Effectiveness of duplex metal interphase layr on the improvement of fatigue resistance in SiC fiber-reinforced Ti-15-3 composite was proved from the experimental evidences.