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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >A study of mechanical homogeneity in as-cast bulk metallic glass by nanoindentation
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A study of mechanical homogeneity in as-cast bulk metallic glass by nanoindentation

机译：纳米压痕技术研究铸态块状金属玻璃的机械均质性

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摘要

A surface softening effect induced during copper-mould suction casting of bulk metallic glass is investigated as a function of rod diameter and glass fragility index, m, by nanoindentation. A reduction in hardness and reduced modulus at the rod surface is found to be favoured in small diameter castings and in fragile systems, respectively resulting from limited in-situ annealing and from a greater diversity of metastable atomic environments in the potential energy landscape of fragile glasses. Enhanced propensity for shear transformation zone nucleation in the low moduli surface is explained in terms of reduced atomic connectivity arising from a reduction in local co-ordination number and a lowering of the shear modulus. Finally, the structure and mechanical diversity that is possible in as-cast bulk metallic glass rods is explored through a relative quantification of shear modulus and plastic zone size across the whole as-cast state and in a single rod. These findings illustrate the sensitivity of bulk metallic glass to preparation, especially in respect of thermal history, potentially making replication of mechanical data between researchers problematic.
机译：通过纳米压痕，研究了散装金属玻璃的铜模吸铸过程中引起的表面软化效果与棒直径和玻璃脆性指数m的关系。发现在小直径铸件和易碎系统中，棒状表面硬度的降低和模量的降低是有利的，这分别是由于有限的原位退火和易碎玻璃的势能态中亚稳态原子环境的多样性所导致的。 。通过降低局部配位数和降低剪切模量，可降低原子的连通性，从而解释了低模量表面中剪切转变区成核倾向的提高。最后，通过对整个铸态和单个棒中剪切模量和塑性区大小的相对定量，探索了铸态块状金属玻璃棒中可能存在的结构和机械多样性。这些发现说明了大块金属玻璃对制备的敏感性，特别是在热历史方面，可能使研究人员之间的机械数据复制成为问题。

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