Simultaneously enhancing fracture toughness and strength in a hierarchical nanolamella-structured alloy
Simultaneously enhancing fracture toughness and strength in a hierarchical nanolamella-structured alloy
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DOI：
10.1016/j.msea.2014.06.026
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发表时间：
2014-08
期刊：
影响因子：
6.4
通讯作者：
Ming Li;D. Guo;Qian Zhang;T. Ma;Yindong Shi;Guosheng Zhang;Xiaohong Li;Xiangyi Zhang
中科院分区：
文献类型：
--
作者：
Ming Li;D. Guo;Qian Zhang;T. Ma;Yindong Shi;Guosheng Zhang;Xiaohong Li;Xiangyi Zhang
一般来说，在大多数结构材料中，强度和断裂韧性是相互排斥的。在这里，我们报告的同时增强的强度和断裂韧性的层次nanolamella结构的TiZrAlV，包括lameprazole与纳米和亚微米尺寸的宽度连同一些亚微米和微米尺寸的晶粒。分级纳米片层结构合金显示出优异的组合，高屈服强度（σs~1438 MPa）和断裂韧性（KIC~57 MPa m1/2）相比，其粗层对应物。合金的高强度是由大量的纳米层状组织引起的，而断裂韧性的提高主要是由于粗大的α层状组织和晶粒具有较高的应变硬化能力，以及纳米层状组织的复杂应变路径增强了合金的抗裂纹扩展能力，改变了断裂过程中的裂纹路径。
In general, strength and fracture toughness are mutually exclusive in most structural materials. Here, we report a simultaneous enhancement of both the strength and fracture toughness in a hierarchical nanolamella-structured TiZrAlV that consists of lamellae with nano- and submicrometer-sized widths together with a few submicrometer- and micrometer-sized grains. The hierarchical nanolamella-structured alloy shows an excellent combination of high yield strength (σs~1438 MPa) and fracture toughness (KIC~57 MPa m1/2) as compared with its coarse-laminated counterpart. The high strength results from a lot of nanoscale lamellae in the alloy, and the enhanced fracture toughness can be attributed to both the coarseαlamellae and grains that have a high strain hardening capability and the complex strain paths caused by a hierarchical nanolaminated structure, which may enhance the resistance to crack growth and change the crack path during fracture processes.