热处理工艺对B_4C/2519A复合材料相组成及显微组织的影响  

Effect of heat treatment process on phase composition and microstructure of B_4C/2519A composite

作　　者：雷攀[1] 夏长清[1] 周飞[1] 曾凡浩[2] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2012年第3期321-326,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：总装备部预研基金资助项目(51312010311)

摘　　要：采用XRD、金相、SEM和EDS等测试手段对无压浸渗法制备的B4C/2519A复合材料热处理前后的物相组成、显微组织和微区成分进行研究。结果表明,热处理前的B4C/2519A复合材料中以Al相为主,其次是B4C、Al3BC和AlB2相;经900℃×25 h热处理后主要为Al3BC相,其次为B4C、Al和AlB2相。随热处理温度的提高和热处理时间的延长,在B4C/2519A复合材料的AlB2相含量逐渐减少的同时,Al3BC相的含量逐步增加;经900℃×25 h热处理后,其主要生成相为Al3BC,而经700℃×25 h热处理后的主要生成相为AlB2相。The effect of heat treatment process on phase composition and microstructure of B4C/2519A composite prepared by pressureless infiltration technology was studied by XRD, optical microscopy, SEM and EDS. The results show that the main phase of B4C/2519A composite before heat treatment is A1, and then B4C, AI3BC and A1B2, while the main phase turns to be A13BC after heat treatment at 900 ℃×25 h. The quantity of AIB2 in B4C/2519A composite decreases gradually, while the quantity of A13BC increases with increasing the heat treatment temperature or prolonging the holding time. The main phases are A13BC and A1B2 corresponding to the heat treatment at 900℃ ×25 h and 700 ℃×25 h, respectively.

关 键 词：B4C 2519A复合材料 热处理 相组成 显微组织 

分 类 号：TB333[一般工业技术—材料科学与工程]