High temperature strength, fracture toughness and oxidation resistance of Nb-Si-Al-Ti multiphase alloys

被引：87

作者：

Murayama, Yonosuke ^{[1
]}

Hanada, Shuji ^{[1
]}

机构：

[1] Tohoku Univ, Inst Mat Res, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan

来源：

SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS | 2002年 / 3卷 / 02期

关键词：

Nb-Si-Al-Ti quaternary diagram; Niobium solid solution; Nb(3)AL; Nb5Si3; High temperature strength; Fracture toughness; Oxidation resistance;

D O I：

10.1016/S1468-6996(02)00005-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nb Si Al Ti quaternary phase diagram around three-phase region, which consists of niobium solid solution (Nbss), Nb3Al and Nb5Si3, is constructed in this study. The three-phase region exists up to titanium content of about 20 mol%. Based on the quaternary phase diagram, three-phase alloys containing Nbss from about 50 to 75% in volume are prepared to improve high temperature strength, room temperature fracture toughness and oxidation resistance simultaneously. When microstructure and composition are optimized (Nb-ss + Nb3Al + Nb5Si3) three-phase alloy with the addition of titanium exhibits higher compressive strength than nickel-based superalloys at room temperature to 1573 K. Fracture toughness at room temperature of (Nb-ss + Nb3Al + Nb5Si3) three-phase alloys is increased to over 12 MPa m(1/2) by the addition of titanium without sacrificing high temperature strength. Oxidation resistance of (Nb-ss + Nb3Al + Nb(5)Si(3)3) three-phase alloys is improved by the addition of titanium. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：145 / 156

页数：12

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