Abstract The B2 phase-containing Bulk Metallic Glass (BMG) composites, as a promising remedy to tackle the strain-softening and brittleness of BMGs, has been widely applied to enhance the work-hardening and plastic deformability. A novel strategy was proposed to select the composition of an alloy which effectively promotes the formation of B2–ZrCo phase. We designed and prepared six compositions and seven rod samples, and then analysed the precipitation of crystalline phase together with the mechanical properties. We found that the primary phases administrate the mechanical properties and the composition of an alloy determines the formation of crystalline phases. Also, the cooling rate cannot enhance the B2–ZrCo phase formation in as-cast Zr–Co–Al BMG composites. As a result, we found that the formation of a large quantity of glass matrix and only B2–ZrCo phase cannot be achieved simultaneously in as-cast Zr–Co–Al alloys. In order to resolve this issue, flash annealing has been introduced to solve this problem. Different compositions correspond to different critical heating rates and high heating rate usually aggravates the difficulty to achieve this aim. In order to reduce critical heating rate, the conventional annealing, which can be well controlled, was used to select the alloy composition and compare formation of the B2–ZrCo phase. And thus, an optimal composition of Zr–Co–Al alloy can be selected to produce the BMG composites incorporating the only B2–ZrCo phase via flash annealing. Therefore, we believe that this work provides a novel recipe to design the Zr–Co–Al BMG composites incorporating the only B2–ZrCo phase.

中文翻译：

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一种设计仅包含 B2-ZrCo 相的 Zr-Co-Al BMG 复合材料的新策略

摘要 含 B2 相的块状金属玻璃 (BMG) 复合材料作为解决 BMG 应变软化和脆性的一种有前景的补救措施，已被广泛应用于提高加工硬化和塑性变形能力。提出了一种新的策略来选择有效促进 B2-ZrCo 相形成的合金成分。我们设计并制备了六种成分和七个棒状样品，然后分析了结晶相的沉淀和力学性能。我们发现主相决定了机械性能，合金的成分决定了结晶相的形成。此外，冷却速度不能增强铸态 Zr-Co-Al BMG 复合材料中 B2-ZrCo 相的形成。因此，我们发现在铸态 Zr-Co-Al 合金中不能同时形成大量的玻璃基体和 B2-ZrCo 相。为了解决这个问题，已经引入了闪光退火来解决这个问题。不同的成分对应不同的临界升温速率，高升温速率通常会加剧实现这一目标的难度。为了降低临界加热速率，可以很好地控制常规退火，用于选择合金成分和比较 B2-ZrCo 相的形成。因此，可以选择 Zr-Co-Al 合金的最佳成分，通过快速退火生产仅包含 B2-ZrCo 相的 BMG 复合材料。所以，