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采用粉末冶金技术制备Mo-12Si-8.5B(at%)合金,对制备材料的微观组织形貌进行观察。结果表明:合金的微观组织为Mo-Mo3Si-Mo5SiB2,与Mo-Si-B相图预测一致;Mo-Si-B合金中新相(如Mo3Si,Mo5SiB2等增强相)的出现取决于Mo-Si-B合金中Mo、Si、B组分的相对含量以及制备工艺条件,符合相图的变化规律。断裂韧性和抗氧化性测试表明:制备材料的抗氧化性明显优于文献值;断裂韧性稍好于MoSi2。其机制可能为Mo-12Si-8.5B合金材料是富Mo(体心立方结构)的Mo-Si-B合金,并且Mo能够与Mo3Si、Mo5SiB2形成低共熔的微结构,合金设计的假设是体心立方Mo固溶体的存在将改善多相合金的性能。
The microstructure of Mo-12Si-8.5B (at%) was prepared by powder metallurgy technique. The results show that the microstructure of the alloy is Mo-Mo3Si-Mo5SiB2, which is consistent with the prediction of Mo-Si-B phase diagram. The appearance of new phases (such as Mo3Si and Mo5SiB2) in Mo-Si- B alloy Mo, Si, B relative content of components and preparation conditions, in line with the phase diagram of the variation. The results of fracture toughness and oxidation resistance show that the oxidation resistance of the prepared material is better than that of the literature; the fracture toughness is slightly better than MoSi2. The mechanism may be Mo-12Si-8.5B alloy material is a Mo-Si-B alloy rich in Mo (body-centered cubic structure), and Mo can form eutectic microstructure with Mo3Si, Mo5SiB2, The presence of a cubic cubic Mo solid solution will improve the performance of the multiphase alloy.