Investigations on collision intensity of minor-phase globule and the resulting morphology in Fe-58wt% Sn powder
Investigations on collision intensity of minor-phase globule and the resulting morphology in Fe-58wt% Sn powder
复制标题
研究%20on%20碰撞%20强度%20of%20次相%20球状%20和%20%20所得%20形态%20in%20Fe-58wt%%20Sn%20粉末
DOI：
10.1016/j.molliq.2020.113285
复制
发表时间：
2020
影响因子：
6
通讯作者：
Nan Wang
中科院分区：
文献类型：
--
作者：
Lili Tian;Yinli Peng;Xiaowei Lei;Wenjing Yao;Meng'en Liu;Nan Wang
研究了不同粒径Fe-58wt%Sn粉末的液液相分离组织及其形成机理。在实验中，我们发现，小尺寸的粉末更容易呈现核壳结构，而大尺寸的粉末更容易形成球状分散结构。为了解释这一现象，对半径为200 μm和400 μm的粉末进行了碰撞核的对比研究，结果表明，小颗粒粉末中的碰撞强度比大颗粒粉末中的碰撞强度大近10倍。这种差异可能是造成小粉末和大粉末中各种形态的原因。此外，通过对透明SCN-水体系的观察实验，研究了碰撞强度与凝固形态的关系。同时也证实了高的碰撞强度有利于核壳结构的形成。这一发现对不混溶合金粉末的材料加工具有重要意义。
Liquid-liquid phase separation microstructures of different-sized Fe-58 wt% Sn powders and the formation mechanism were investigated. Experimentally, we found that the small-sized powder is easier to show a core-shell structure, while the large one readily forms a globule-dispersed structure. To explain this, collision kernels were comparatively studied in (Radius=) 200 μm and 400 μm powders, and the results demonstrated that the collision intensity in the small powder is almost 10 times stronger than that in the large one. Such a difference can be responsible for the various morphologies in the small and large powders. In addition, we examined the relationship between collision intensity and solidification morphology by means of an observational experiment on transparent SCN-H2O system. It also confirmed that the high collision intensity is beneficial to the core-shell structure. This finding is of crucial importance in material processing of immiscible alloy powders.