組織與性能的影響
(1. 哈爾濱工業(yè)大學 材料科學與工程學院，哈爾濱 150001；
2. 中國石油獨山子石化公司研究院，克拉瑪依 833600)
摘 要: 采用擠壓鑄造法制備了不同體積分數(shù)的TiB2P/6061Al復合材料，利用掃描電鏡、透射電鏡、硬度計、三點彎曲等手段對復合材料的組織與力學性能進行了研究，分析了熱處理工藝對其組織性能的影響。結果表明：不同的熱處理條件下TiB2P/6061Al復合材料的組織不同：退火態(tài)時觀察到再結晶晶粒和少量位錯；時效態(tài)時觀察到大量的位錯和析出相，界面產(chǎn)物尺寸比退火態(tài)時相對大些，且在界面附近的基體中存在明顯的無析出區(qū)。熱處理狀態(tài)對彈性模量的影響不大，但對材料的硬度和抗彎強度影響較大。45％TiB2P/6061Al復合材料時效處理后硬度和抗彎強度分別比退火態(tài)時提高了40%和23%。
關鍵字: 熱處理；擠壓鑄造；TiB2P/6061Al復合材料；力學性能
properties of TiB2P/6061Al composites
fabricated by squeeze casting
（1. School of Materials Science and Engineering, Harbin Institute of Technology,
Harbin 150001, China;
2. Research Institute of Dushanzi Petrochemical Company, CNPC,Kelamayi 833600, China）
Abstract: TiB2P/6061Al composites with different volume fractions were fabricated by squeeze casting. The microstructure and mechanical properties of the composites were studied by means of scanning electron microscope, transmission electron microscope, hardness measurement and tensile test, and the effect of heat treatment on microstructure and properties of the composites was analyzed. The results show that the composites have different microstructure under different conditions of heat treatment. The recrystallized grains and some dislocations are observed in the composites after annealing treatment, while plenty of dislocations and precipitates are observed in the composites after aging treatment and the size of precipitates is bigger than that after annealing treatment. And in the composites after aging treatment, there exists obvious precipitate free zone in the matrix nearby the grain boundaries. The effect of heat treatment on elastic modulus is not evident, but it is much bigger on hardness and bending strength of the composites. After aging treatment, the hardness and bending strength of 45％TiB2P/6061Al composite are respectively 40% and 23% higher than those after annealing treatment.
Key words: heat treatment; squeeze casting; TiB2P/6061Al composites; mechanical properties
