Effect of annealing on the microstructures and Vickers hardness at room temperature of intermetallics in Mo-Si system

作     者：YANG Haibo LI Wei SHAN Aidang WU Jiansheng Key Laboratory of Ministry of Education for High Temperature Materials and Tests & Department of Material Science and Engieering, Shanghai Jiao Tong University, Shanghai 200030, China 

作者机构：上海交通大学 教育部高温材料及高温测试开放实验室 上海 200030 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2004年第23卷第2期

页      面：176-181页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

主　　题：material experiment lamellar structure microstructure vickers hardness anneal intermetallics Mo-Si system 

摘      要：The microstructures and Vickers hardness at room temperature of arc-meltingprocessed intermetallics of Mo_5Si_3-MoSi_2 hypoeutectic alloy and hypereutectic alloy annealed at1200℃ for different time were investigated. Lamellar structure consisted of Mo_5Si_3 (D8m) phaseand MoSi_2 (C11_b) phase was observed in all the alloys. For Mo_5Si_3-MoSi_2 hypoeutectic alloy, thelamellar structure was found only after annealing and developed well with fine spacing on the orderof hundred nanometers after annealing at 1200℃ for 48 h. But when the annealing time was up to 96h, the well-developed lamellar structure was destroyed. For Mo_5Si_3-MoSi_2 hypereutectic alloy, thelamellar structure was found both before and after annealing. However the volume fraction andspacing of the lamellar structure did not change significantly before and after annealing. Theeffects of the formation, development and destruction of lamellar structure on Vickers hardness ofalloys were also investigated. When Mo_5Si_3-MoSi_2 hypoeutectic alloy annealed at 1200℃ for 48 h,the Vickers hardness was improved about 19% compared with that without annealing and formation oflamellar structure. The highest Vickers hardness of Mo5Si3-MoSi_2 hypereutectic was increasing about18% when annealing at 1200℃ for 48 h.