Fatigue Crack Initiation and Propagation Dominated by Crystallographic Factors in TiB/near α-Ti Composite

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外文摘要：Discontinuously reinforced titanium matrix composites(DRTMCs)with a network structure have been extensively researched due to their superior combination of strength and ductility.However,their fatigue performance has remained unknown.In order to elucidate the fatigue behavior of DRTMCs,a tension-tension fatigue test was performed on a TiB/near α-Ti compos-ite with network structure.The results showed that the variability of fatigue lifetime increased as the stress level decreased.Fractography analysis indicated that fatigue crack initiation was associated with facet formation,while the subsequent propa-gation was hindered by the network structure comprising TiB whiskers and silicides.Crystallographic characterization further revealed that facets formed due to a combination of shear and normal stress.The reduction in fatigue lifetime was attributed to an increase in the effective slip length,which was influenced by the orientation of grains near the crack-initiation sites toward basal slip in the life-limiting specimen.Quasi in situ observation suggested that the crack initiation was facilitated by both basal and prismatic slip of α-Ti as well as fracture of TiBw.Crack propagation was found to be associated with basal and prismatic slip systems with high Schmid factors,regardless of whether the crack was intergranular or intragranular.

外文关键词：

Titanium matrix compositeTiBwFatigue lifetime variabilityCrack initiationCrack propagation

作者：

Fanchao Meng、Rui Zhang、Shuai Wang、Fengbo Sun、Run Chen、Lujun Huang、Lin Geng

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作者单位：

School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China

Waikato Centre for Advanced Materials and Manufacturing,School of Engineering,University of Waikato,Hamilton 3240,New Zealand

State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China

基金：

National Key R&D Program of ChinaNational Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)Heilongjiang Provincial Natural Science Foundation of China

项目编号：

2021YFB37012035217113752261135543U22A20113TD2020E001

出版年：

2024

DOI：

10.1007/s40195-024-01677-1

金属学报(英文版)

中国金属学会

金属学报(英文版)

CSTPCD

影响因子：0.77

ISSN：1006-7191

年,卷(期)：2024.37(5)

参考文献量50