Composition, Microstructure, Phase Constitution and Fundamental Physicochemical Properties of Low-Melting-Point Multi-Component Eutectic Alloys

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2017,（2）
• 页码范围: 131-154
• 页数: 24页
• 语种: 英文

摘要

Low-melting-point alloys have an extensive applications in the fields of materials processing,phase change energy storage,electronic and electrical automatic control,continuous casting simulation,welding,etc.Specifically,the eutectic compositions make up a large number of low-melting-point alloys that are exploited because of their desirable features like single melting peaks,excellent operational reliability,and casting fluidity.However,the fundamental physicochemical properties from the current available literature on low-melting-point multi-component eutectic alloys (LMP-MCEAs) are rather rare and lowly accurate,including the exact melting temperatures and compositions,constituent phases,microstructures and morphologies,melting enthalpies,specific heats,densities,and so on.This lack of information seriously limits the development and application of low-melting-point multi-component eurectic alloys.In this paper,the low-melting-point multi-component eutectic alloys composed of Bi,Cd,Sn,Pb,and In elements synthesized by high vacuum induction melting and fundamental data were investigated by scanning electron microscopy (SEM),energy dispersive spectrometry (EDS),X-ray diffraction (XRD),differential scanning calorimetry (DSC),and density analysis instrument.Most of the LMP-MCEAs with complex eutectic morphology structures and XRD diffraction patterns could be explained with the fact that they were three-phase eutectic alloys with mixed growth way.Generally,LMP-MCEAs present an extremely low melting point between 48.3 and 124 ℃ and high density between 8 and 10 g/cm3.