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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 >Enhancement of plasticity in Co-Nb-B ternary bulk metallic glasses with ultrahigh strength
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Enhancement of plasticity in Co-Nb-B ternary bulk metallic glasses with ultrahigh strength

机译：增强具有超高强度的Co-Nb-B三元体金属玻璃的可塑性

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摘要

A family of ultrahigh strength Co-based bulk metallic glasses (BMGs) with critical diameters up to 2 mm was fabricated in ternary Co _(65 - x)Nb _8B _(27 + x) (at.%, x = 1-5) alloy system. The highest glass forming ability for the alloy composition with x = 3 is in agreement with its largest supercooled liquid region, lowest liquidus temperature and eutectic behavior, which are closely related to the presence of backbone structure formed by transition metal (Nb) and metalloid elements (B). The present glassy alloy system also possesses excellent mechanical properties including both yield strength of 4610-5340 MPa and plasticity up to 5% simultaneously, which is rarely reported for other BMGs known so far. It is found that changes in the proportion of metalloid B contents have significant influence on the atom packing fraction and therefore the enhanced yield strength. Meanwhile, the enhancement of plasticity is ascribed to the formation of nanoscale-range order clusters in the CoNbB BMGs.
机译：在三元Co _（65-x）Nb _8B _（27 + x）（at。％，x = 1-5）中制造了一系列具有高达2 mm的临界直径的超高强度Co基块状金属玻璃（BMG） ）合金系统。 x = 3的合金成分的最高玻璃形成能力与其最大的过冷液体区域，最低的液相线温度和低共熔行为相一致，这与过渡金属（Nb）和准金属元素形成的骨架结构的存在密切相关（B）。本发明的玻璃合金系统还具有优异的机械性能，包括4610-5340 MPa的屈服强度和同时高达5％的可塑性，这对于迄今为止已知的其他BMG很少报道。已经发现，准金属B含量比例的改变对原子堆积分数具有显着影响，因此提高了屈服强度。同时，可塑性的增强归因于在CoNbB BMG中形成了纳米级有序簇。

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