High temperature low cycle fatigue behavior of titanium aluminide Ti-24Al-15Nb-Mo alloy

被引：22

作者：

Cao, Jingxia ^{[1
]}

Bai, Fang ^{[1
]}

Li, Zhenxi ^{[1
]}

机构：

[1] Beijing Inst Aeronaut Mat, Lab Titanium Alloys, Beijing 100095, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 424卷 / 1-2期

关键词：

Ti3Al-based alloy; intermetallics; low cycle fatigue; fracture;

D O I：

10.1016/j.msea.2006.02.040

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The low cycle fatigue behavior of a Ti-24Al-15Nb-1 Mo alloy with primary alpha(2) phase, platelet O phase and transformed beta triplex microstructure has been studied. The results show the as studied alloy exhibits weak cyclic hardening during strain controlled low cycle fatigue test at 650 degrees C. The low cycle fatigue behavior of Ti-24Al-15Nb-1Mo alloy obeys the Manson-Coffin behavior. The fatigue life is governed by elastic strain deformation under the present test condition. The fatigue cracks initiate from the primary alpha(2) phase, or the interface of the primary alpha(2) and transfon-ned beta matrix. The platelet O phase is the barrier to crack propagation by deflecting the microcrack under cyclic loading. The initiation and linkage of microcracks are the important features in governing fatigue crack growth. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：47 / 52

页数：6

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