Compressive plasticity and toughness of a Ti-based bulk metallic glass
Compressive plasticity and toughness of a Ti-based bulk metallic glass
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DOI：
10.1016/j.actamat.2009.11.013
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发表时间：
2010-03-01
期刊：
影响因子：
9.4
通讯作者：
Lewandowski, J. J.
中科院分区：
文献类型：
--
作者：
Gu, X. J.;Poon, S. J.;Lewandowski, J. J.
本文研究了Ti_（40）Zr_（25）Cu_（12）Ni_（33）Be_（20）块体非晶合金（BMG）试样尺寸变化对压缩塑性和断裂韧性/断裂能的影响。样品尺寸的变化单独产生了广泛不同的压缩塑性值。虽然这些都与测量的泊松比的变化为相同的组合物的样品铸造成不同的样品尺寸，显着的影响或测试条件，除了泊松比上测得的压缩塑性也证明。断裂韧性测试油相同的材料/尺寸，表现出零压缩塑性产生缺口和疲劳预裂纹韧性超过100 MPa m（1/2），而韧性的大小上的尺寸效应同样表现出来。讨论的来源（S）的尺寸对韧性的影响，除了证明，可以获得特殊的韧性，在这种BMG，在一定的测试条件下，基本上表现出零压缩塑性。塑性/韧性的表观临界泊松比因此在这些非常不同类型的试验中是不同的。(c)2009 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The effects of changes in sample dimensions on the compressive plasticity and fracture toughness/energy have been determined for Ti40Zr25Cu12Ni3Be20 bulk metallic glass (BMG). Changes in sample dimensions alone produced widely different values for compressive plasticity. While these were correlated with changes to the measured Poisson's ratio for samples of the same composition cast into different sample sizes, significant effects or testing conditions apart from the Poisson's ratio on the measured compressive plasticity are also demonstrated. Fracture toughness testing oil the same material/size that exhibited zero compressive plasticity produced both notch and fatigue pre-cracked toughness in excess of 100 MPa m(1/2), while a size effect on the magnitude of toughness was similarly demonstrated. Discussions on the source(s) of the size effect on toughness are provided in addition to demonstrating that exceptional toughness can be obtained in this BMG which exhibits essentially zero compressive plasticity under certain test conditions. The apparent critical Poisson's ratio for plasticity/toughness is thus different in these very different types of tests. (c) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.