热处理对Mo-Si系金属间化合物微观组织和断裂韧性的影响

Abstract

Abstract: The Mo₃Si-Mo₅Si3 eutectic alloy , Mo₅Si3-MoSi₂ hypoeutectic alloy and hypereutectic alloy of Mo-Si system were prepared by arc-melting high purity elements of Mo-99.9 % and Si-99.99 %. The arc-melting buttonswere then annealed at 1200 ℃. The formation , alternation and destruction of lamellar structure were observed in alloys. After annealing at 1200 ℃for 48h , the well-developed lamellar structure consisting of Mo₅Si3 (D8m) / MoSi₂(C11b) with fine spacing of hundsed nanometer order was found in Mo₅Si3-MoSi₂ hypoeutectic alloy. The lamellarstructure did not change significantly before and after annealing in Mo₅Si3-MoSi₂ hypereutectic alloy. No lamellarstructure was observed in Mo₃Si-Mo₅Si3 eutectic alloy both before and after annealing. The fracture toughness( KIC) of alloys was determined by using Vickers indentation technique. The relationship between microstructureand KIC was investigated.

Key words: intermetallic, annealing, microstructure, fracture toughness

YANG Hai-bo;LI Wei;SHAN Ai-dang;WU Jian-sheng. The Effect of Heat-Treatment on Microstructure and Fracture Toughness of Intermetallics in Mo-Si System[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2004, 25(2): 201-204.

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The Effect of Heat-Treatment on Microstructure and Fracture Toughness of Intermetallics in Mo-Si System

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