Chemistry (intrinsic) and inclusion (extrinsic) effects on the toughness and Weibull modulus of Fe-based bulk metallic glasses
Chemistry (intrinsic) and inclusion (extrinsic) effects on the toughness and Weibull modulus of Fe-based bulk metallic glasses
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DOI：
10.1080/09500830802438131
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发表时间：
2008-10
影响因子：
1.2
通讯作者：
A. Shamimi Nouri;X. Gu;S. Poon;G. Shiflet;J. Lewandowski
中科院分区：
文献类型：
--
作者：
A. Shamimi Nouri;X. Gu;S. Poon;G. Shiflet;J. Lewandowski
采用系统的成分变化来提高各种铁基大块金属玻璃（BMG）的缺口韧性。Fe 50 Mn 10 Mo 14 Cr 4C 16 B6 BMG在室温下具有非常高的硬度（例如1/2GPa）但具有非常低的缺口韧性（例如5.7MPa m1/2），这与脆性特征的断裂表面观察一致。许多其他Fe-BMG变体，通过合金化学的系统变化来改变泊松比，表现出更高的韧性，但数据更分散，反映在较低的威布尔模量。SEM检查显示，对于给定的化学性质，断裂起始总是发生在表现出较低韧性和/或威布尔模量的样品中的夹杂物处。这些意见的可靠性BMG的影响进行了讨论。
Systematic changes in composition were employed to increase the notch toughness of a variety of Fe-based Bulk Metallic Glasses (BMGs). The Fe50Mn10Mo14Cr4C16B6 BMG possessed very high hardness (e.g. 12 GPa) but very low notch toughness (e.g. 5.7 MPa m1/2) at room temperature, consistent with fracture surface observations of brittle features. Many of the other Fe-BMG variants, created to change the Poisson's ratio via systematic changes in alloy chemistry, exhibited higher toughness but more scatter in the data, reflected in a lower Weibull modulus. SEM examination revealed fracture initiation always occurred at inclusions in samples exhibiting lower toughness and/or Weibull modulus for a given chemistry. Implications of these observations on reliability of BMGs are discussed.