Effects of element addition on liquid phase separation of Bi-Ga immiscible alloy: Characterization by electrical resistivity and coordination tendency
Effects of element addition on liquid phase separation of Bi-Ga immiscible alloy: Characterization by electrical resistivity and coordination tendency
复制标题
元素添加对 Bi-Ga 难混溶合金液相分离的影响：电阻率和配位倾向表征
DOI：
10.1016/j.matdes.2016.10.048
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发表时间：
2017
影响因子：
8.4
通讯作者：
Jiang Shaoning
中科院分区：
文献类型：
--
作者：
Wang Zhiming;Sun Zhiping;Wang Xiaoli;Zhang Hui;Jiang Shaoning
不混溶合金的应用受到凝固时液相分离引起的宏观偏析的限制。因此液相分离倾向是设计难混溶合金时应考虑的首要因素。本工作通过电阻率测量研究了锡和铟的添加对Bi33.3Ga66.7(at.%)难混溶合金液相分离的影响。观察到Bi33.3Ga66.7合金的液相分离趋势因锡的存在而减弱，但因少量的铟的添加而增强。基于热力学计算，从元素间配位倾向的角度来理解元素添加对难混溶合金液相分离的影响：元素的添加减弱了难混溶合金的液相分离倾向，元素与液态难混溶合金的两种组成元素均呈现同配位倾向；添加元素增强了液相分离倾向，该元素在液态时与难混溶合金的一种组成元素呈现异配位倾向，而与另一种元素呈现同配位倾向。
The application of immiscible alloys is limited by their macrosegregation caused by liquid phase separation upon solidification. So liquid phase separation tendency is the primary factor should be concerned in the design of an immiscible alloy. In present work, the effects of tin and indium additions on liquid phase separation of Bi33.3Ga66.7(at.%) immiscible alloy were studied by electrical resistivity measurement. It is observed that the liquid phase separation tendency of Bi33.3Ga66.7alloy is weakened by tin but enhanced by indium addition within a minor quantity. Based on thermodynamic calculations, the effects of element additions on liquid phase separation of immiscible alloy were understood in the viewpoint of coordination tendency between elements: liquid phase separation tendency of immiscible alloy is weakened by the element addition which presents homo-coordination tendency with both the constituent elements of the immiscible alloy in liquid state; liquid phase separation tendency is enhanced by the element addition which presents hetero-coordination tendency with one of the constituent elements of the immiscible alloy but homo-coordination tendency with the other in liquid state.