REACTION ZONE MICROSTRUCTURE IN A TI3AL + NB/SIC COMPOSITE

被引:78
作者
BAUMANN, SF [1 ]
BRINDLEY, PK [1 ]
SMITH, SD [1 ]
机构
[1] NASA,LEWIS RES CTR,CLEVELAND,OH 44135
来源
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1990年 / 21卷 / 06期
关键词
D O I
10.1007/BF02672571
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A composite of Ti-25Al-13Nb (atomic percent) matrix with a continuous SiC fiber (SCS-6) reinforcement was fabricated by hot pressing powder cloths and mats of fiber. The fiber/matrix reaction zone was studied using scanning electron microscopy (SEM) and transmission electron microscopy/analytical electron microscopy (TEM/AEM) techniques. The extent of reaction was determined, phases were identified, and solute partitioning among the phases was determined. It was found that the matrix had reacted only with a portion of the carbon-rich outer layer of the SCS-6 fiber. The reaction zone contained two concentric zones which are distinguished by the presence of different carbide phases. Both zones contained a hexagonal Si-bearing phase, and one of the zones also contained some fine scattered porosity. The results are discussed with reference to available phase equilibria data. © 1990 The Metallurgical of Society of AIME.
引用
收藏
页码:1559 / 1569
页数:11
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