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Composition and size dependent brittle-to-malleable transitions of Mg-based bulk metallic glasses

机译：镁基块状金属玻璃的成分和尺寸相关的脆性到易碎转变

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Mg-based bulk metallic glasses (BMGs) were often treated as brittle materials. However, some Mg-based BMGs were recently reported to show malleability. In order to identify the reasons for the achievement of the brittle-to-malleable transitions in the Mg-based BMGs, we systematically investigated the mechanical properties of four Mg-based BMGs (Mg_(65)Cu_(25)Gd_(10), Mg_(65)Cu_(20)Ni_5Gd_(10), Mg_(75)Ni_(15)Gd_(10), and Mg_(75)Ni_(15)Gd_5Nd_5 BMGs) using the uniaxial compression tests on the samples with sizes of o 1 × 2 mm~2 and o 2 × 4 mm~2. The corresponding fracture morphology was observed by scanning electron microscopy (SEM). These Mg-based BMGs displayed the composition or size dependent brittle-to-malleable transitions, accompanied by the fracture mode transition from the cleavage fracture to the shear fracture. It appeared that the Mg-based BMGs were sensitive to cleavage cracks upon loading. The brittle-to-malleable transitions of the Mg-based BMGs were related to not only the stability of shear banding but also the nucleation and propagation of cleavage cracks. It was demonstrated that the suppression of the nucleation and propagation of cleavage cracks could favor the transition from the cleavage fracture to the shear fracture and encourage the brittle-to-malleable transition for the Mg-based BMGs. The underlying mechanism for the brittle-to-malleable transitions of the Mg-based BMGs was discussed with respect to both the composition and size effects.
机译：镁基块状金属玻璃（BMG）通常被视为脆性材料。但是，最近有报道称一些基于镁的BMG具有延展性。为了确定在基于Mg的BMG中实现脆性到易碎转变的原因，我们系统地研究了四种基于Mg的BMG（Mg_（65）Cu_（25）Gd_（10， Mg_（65）Cu_（20）Ni_5Gd_（10），Mg_（75）Ni_（15）Gd_（10）和Mg_（75）Ni_（15）Gd_5Nd_5 BMG）对尺寸为o 1×2 mm〜2和o 2×4 mm〜2通过扫描电子显微镜（SEM）观察到相应的断裂形态。这些基于Mg的BMG表现出组成或尺寸相关的脆性到易碎性转变，伴随着从解理断裂到剪切断裂的断裂模式转变。看来，基于镁的BMG在加载时对劈裂裂纹敏感。镁基BMG的脆性到易碎的转变不仅与剪切带的稳定性有关，而且与解理裂纹的形核和扩展有关。结果表明，抑制裂隙裂纹的形核和扩展可能有利于从裂隙断裂到剪切断裂的过渡，并促进镁基BMG的脆性到易碎性转变。讨论了基于镁的BMG脆性到易碎转变的基本机理，包括成分和尺寸效应。

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