Formation of Cu-rich crystalline/NiNb-rich amorphous composite induced by liquid phase separation
Formation of Cu-rich crystalline/NiNb-rich amorphous composite induced by liquid phase separation
复制标题
液相分离诱导富铜结晶/富镍铌非晶复合材料的形成
DOI：
10.1016/j.matlet.2013.11.055
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发表时间：
2014-02-01
影响因子：
3
通讯作者：
Wang, Cuiping
中科院分区：
文献类型：
--
作者：
Liu, Xingjun;Zhu, Jiahua;Wang, Cuiping
液相分离现象为熔体纺丝法制备晶态/非晶态复合材料提供了独特的机会。在本研究中，一种新的结晶/非晶复合材料与液滴型微结构的Cu-Ni-Nb不混溶系统进行了研究。结果表明，Cu-30（Ni 38 Nb 62）（70）合金在过冷液态下发生液-液相分离，然后凝固为富Cu晶相和NiNb基非晶相。fcc富铜结晶液滴分散在NiNb基非晶基体中。富铜液滴的晶粒尺寸介于纳米级和微米级之间。另一方面，在轮侧附近观察到明显的没有富Cu纳米颗粒的层。Cu-30（Ni 38 Nb 62）（70）薄带的压痕试验表明，由于形成了较软的富Cu颗粒，因而具有较大的弹塑性变形区和较小的维氏硬度。进一步的研究结果表明，液滴型微结构的形成可能是由于液相分离和非晶相的形成。(C)2013爱思唯尔有限公司版权所有。
Liquid phase separation phenomena give rise to a unique opportunity in developing the crystalline/amorphous composites using melt-spinning method. In this study, a new crystalline/amorphous composite with a droplet-type microstructure is investigated in Cu-Ni-Nb immiscible system. It is found that the Cu-30(Ni38Nb62)(70) alloy undergoes liquid-liquid phase separation in the undercooled liquid state, and then solidifies into Cu-rich crystalline phase and NiNb-based amorphous phase. The fcc Cu-rich crystalline droplets are dispersed in the NiNb-based amorphous matrix. The grain size of Cu-rich droplets is in the range between nanometer dimension order and micrometer order. On the other hand, an obvious layer without Cu-rich nanoparticles is observed near the wheel side. The indentation testing of Cu-30(Ni38Nb62)(70) ribbon shows a larger elastic-plastic deformation area and much smaller Vickers hardness, due to the formation of softer Cu-rich particles. Further results indicate that the formation of droplet-type microstructure could be attributed to the liquid phase separation and amorphous phase formation. (C) 2013 Elsevier B.V. All rights reserved.