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Local melting to design strong and plastically deformable bulk metallic glass composites

机译：局部熔化以设计坚固且可塑性变形的块状金属玻璃复合材料

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Recently, CuZr-based bulk metallic glass (BMG) composites reinforced by the TRIP (transformation-induced plasticity) effect have been explored in attempt to accomplish an optimal of trade-off between strength and ductility. However, the design of such BMG composites with advanced mechanical properties still remains a big challenge for materials engineering. In this work, we proposed a technique of instantaneously and locally arc-melting BMG plate to artificially induce the precipitation of B2 crystals in the glassy matrix and then to tune mechanical properties. Through adjusting local melting process parameters (i.e. input powers, local melting positions, and distances between the electrode and amorphous plate), the size, volume fraction, and distribution of B2 crystals were well tailored and the corresponding formation mechanism was clearly clarified. The resultant BMG composites exhibit large compressive plasticity and high strength together with obvious work-hardening ability. This compelling approach could be of great significance for the steady development of metastable CuZr-based alloys with excellent mechanical properties.
机译：近来，已经探索了通过TRIP（转变诱导的可塑性）效应增强的基于CuZr的块状金属玻璃（BMG）复合材料，以试图在强度和延展性之间取得最佳折衷。但是，这种具有先进机械性能的BMG复合材料的设计仍然是材料工程领域的一大挑战。在这项工作中，我们提出了一种瞬时和局部电弧熔化BMG板的技术，以人为地诱导B2晶体在玻璃状基质中的沉淀，然后调节机械性能。通过调整局部熔化工艺参数（即输入功率，局部熔化位置以及电极与非晶板之间的距离），可以很好地调整B2晶体的尺寸，体积分数和分布，并清楚阐明了相应的形成机理。所得的BMG复合材料表现出大的压缩可塑性和高强度以及明显的加工硬化能力。这种引人注目的方法对于稳定发展具有优异机械性能的亚稳CuZr基合金具有重要意义。

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