High fracture toughness in a hierarchical nanostructured zirconium

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• 作者：Ming Li^a ; ^b ; Defeng Guo^a ; Tengyun Ma^a ; Guosheng Zhang^a ; Yindong Shi^a ; Xiangyi Zhang^a ; ^{xyzh66@ysu.edu.cn" class="auth_mail}
• 关键词：Nanostructured materials ; Fracture ; Thermomechanical processing ; Toughness ; Mechanical characterization
• 刊名：Materials Science and Engineering: A
• 出版年：12 June 2014
• 年：2014
• 卷：606
• 期：Complete
• 页码：330-333
• 全文大小：1317 K

文摘

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~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~78 MPa m^1/2 in coarse-grained Zr. This hierarchical nanostructured Zr shows a good combination of yield strength (蟽_s~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.