The effects on fracture toughness of ductile-phase composition and morphology in Nb-Cr-Ti and Nb-Si in situ composites

被引：128

作者：

Davidson, DL ^{[1
]}

Chan, KS ^{[1
]}

Anton, DL ^{[1
]}

机构：

[1] UNITED TECHNOL RES CTR, E HARTFORD, CT 06108 USA

来源：

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1996年 / 27卷 / 10期

关键词：

D O I：

10.1007/BF02663850

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Niobium-chromium alloys, both single and two phase, were alloyed with titanium in order to enhance fracture toughness and fatigue crack growth resistance. The selection of titanium as an alloying element and the relationship of electronic bonding to toughness are examined. The results indicated that toughness increased with a decreasing number of D + s electrons. Titanium was found to increase the toughness of solid-solution Nb-Cr alloys from approximate to 8 to 87 MPa root m, while for the two-phase ''in situ composites,'' toughness was increased from approximate to 5 to 20 MPa root m, although this is less than expected. Fracture toughness of the composites correlated nonlinearly with the volume fraction of the phases. The evidence suggests that the toughness of the composites is decreased due to fracture of the intermetallic particles and constraint on matrix deformation imposed by the intermetallic. Fracture characteristics of the Nb-Cr-Ti materials are compared to those of Nb-Cr and Nb-Si materials.

引用

页码：3007 / 3018

页数：12

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