利用铜模铸造法获得(Cu0.6Zr0.3Ti0.1)95Nb5块体非晶复合材料试样.该试样中均匀分布富Nb元素的枝晶相.结果表明,相比于非晶基体,枝晶具有更低的硬度值和弹性模量,在加载变形过程中,非晶基体和枝晶界面处产生应力集中,促使非晶基体中剪切带的萌生和分叉增殖,最终获得了约2200 MPa的压缩断裂强度和6.08%断裂应变.与其他Cu基非晶复合材料相比,所制备的(Cu0.6Zr0.3Ti0.1)95Nb5非晶复合材料断裂强度没有明显的降低,证明添加Nb元素是一种非常容易和有效制备实用高强度、高塑性非晶复合材料的方法.
In-situ formed (Cu0.6Zr0.3Ti0.1)95Nb5 bulk metallic glass (BMG) composite with Nb-rich dendrite randomly dispersed in hard glassy matrix was prepared by casting into a water-cooled copper mold. The dendrite has much smaller hardness and elastic modulus than glassy matrix, and the stress concentration at interface provides a channel for the initiating and branching of shear bands upon loading, thus leading to a high compressive fracture strain of 6.08% and fracture strength about 2200 MPa. Comparing with other Cu-based BMG composite, the fracture strength of present (Cu0.6Zr0.3Ti0.1)95Nb5 composite is not significantly reduced, indicating that the addition of Nb in the current work is an effective and effortless way to fabricate new practical BMG composites with enhanced strength and good plasticity.
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