High fracture toughness in a hierarchical nanostructured zirconium

被引：12

作者：

Li, Ming ^{[1
,2
]}

Guo, Defeng ^{[1
]}

Ma, Tengyun ^{[1
]}

Zhang, Guosheng ^{[1
]}

Shi, Yindong ^{[1
]}

Zhang, Xiangyi ^{[1
]}

机构：

[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China

[2] Yanshan Univ, Coll Mech Engn, Qinhuangdao 066004, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 606卷

基金：

中国国家自然科学基金;

关键词：

Nanostructured materials; Fracture; Thermomechanical processing; Toughness; Mechanical characterization; NANOCRYSTALLINE METALS; MECHANICAL-PROPERTIES; DUCTILITY; STRENGTH; MICROSTRUCTURE; DEFORMATION; BEHAVIOR; ZR;

D O I：

10.1016/j.msea.2014.03.110

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Nanocrystalline metals usually exhibit a high strength but a disappointingly low ductility and toughness, which limit their practical utility. Here, we report a high fracture toughness (K-IC similar to 117 MPa m(1/2)) in a hierarchical nanostructured Zr that consists of nano-, sub-micrometer- and micrometer-sized grains, which is much larger than that K-IC similar to 78 MPa m(1/2) in coarse-grained Zr. This hierarchical nanostructured Zr shows a good combination of yield strength (sigma(s)similar to 550 MPa) and fracture toughness as compared with its coarse-grained counterpart. We expect that these results will have implications in the enhancement of fracture toughness of nanocrystalline materials and in the design of high-performance structural materials. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：330 / 333

页数：4

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