文章信息/Info

Title:

Progress of Research on Solidification Process and Microstructure Control of Immiscible Alloys

作者:

趙九洲; 江鴻翔; 孫倩; 黎旺; 何杰

中國科學院金屬研究所， 中國科學技術大學材料科學與工程學院

Author(s):

ZHAO Jiuzhou; JIANG Hongxiang; SUN Qian; LI Wang; HE Jie

Institute of Metal Research, Chinese Academy of Sciences； School of Materials Science and Engineering, University of Science and Technology of China

關鍵詞:

偏晶合金; 凝固; 組織演變; 建模; 模擬

Keywords:

Immiscible alloys;  Solidification;  Microstructure evolution;  Modelling;  Simulation

DOI:

10.7502/j.issn.1674-3962.2017.04.02

文獻標志碼:

A

摘要:

偏晶合金十分廣泛，其中許多具有重要的工業(yè)應用背景，但該類合金凝固時首先發(fā)生液-液相變，極易形成偏析嚴重乃至兩相分離的凝固組織，其凝固過程研究與工業(yè)制備技術研發(fā)受到了嚴重限制。近年來偏晶合金凝固理論受到材料科學領域的高度重視，人們先后在地面、空間和外場作用下開展了大量實驗研究，并開展了廣泛的建模與模擬研究。本文綜述了有關偏晶合金凝固研究的進展，介紹了本研究團隊相關研究工作，展望了未來偏晶合金凝固研究的方向。

Abstract:

Alloys with a miscibility gap in the liquid state are a broad kind of materials. Many of them have great potential applications in the fields such as chemical industry, automobile, machinery, electronic industry for their special physical and mechanical characteristics. However, these alloys have an essential drawback that the miscibility gap poses problems during solidification. When a homogeneous single phase liquid is cooled into the miscibility gap, it develops into two liquids. Generally, the liquid-liquid decomposition leads to a microstructure with serious phase segregation under the conventional solidification conditions. The application of immiscible alloys is, thus, very limited. In recent decades, many experimental and theoretical researches were carried out to investigate the solidification of immiscible alloys under the normal gravity and microgravity conditions. It has been demonstrated that the rapid solidification technique and sub-rapid solidification technique have great future in the manufacturing of immiscible alloys. Addition of effective inoculants for the nucleation of the minority phase droplets and proper application of external fields, e.g., static magnetic field, electric current pulses, etc. may promote the formation of immiscible alloys with a well dispersed microstructure. Up to date, great progress has been made in this field. The objective of this article is to review the research work in this field during the last few decades.