STRENGTH AND DUCTILE-PHASE TOUGHENING IN THE 2-PHASE NB/NB5SI3 ALLOYS

被引:283
作者
MENDIRATTA, MG
LEWANDOWSKI, JJ
DIMIDUK, DM
机构
[1] CASE WESTERN RESERVE UNIV,DEPT MAT SCI & ENGN,CLEVELAND,OH 44106
[2] WRDC MLLM,MAT LAB,WRIGHT PATTERSON AFB,OH 45433
来源
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1991年 / 22卷 / 07期
关键词
D O I
10.1007/BF02667370
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effect of heat treatment on the mechanical properties of Nb-Nb5-Si3 two-phase alloys having compositions Nb-10 and 16 pct Si (compositions quoted in atomic percent) has been investigated. This includes an evaluation of the strength, ductility, and toughness of as-cast and hot-extruded product forms. The two phases are thermochemically stable up to approximately 1670-degrees-C, exhibit little coarsening up to 1500-degrees-C, and are amenable to microstructural variations, which include changes in morphology and size. The measured mechanical properties and fractographic analysis indicate that in the extruded condition, the terminal Nb phase can provide significant toughening of the intermetallic Nb5Si3 matrix by plastic-stretching, interface-debonding, and crack-bridging mechanisms. It has been further shown that in these alloys, a high level of strength is retained up to 1400-degrees-C.
引用
收藏
页码:1573 / 1583
页数:11
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