文章信息/Info

Title:

Thermodynamic and thermophysical databases of multicomponent Al alloys and their applications

作者:

劉樹紅; 凌締成; 黃丹丹; 張帆; 杜勇

中南大學粉末冶金研究院，湖南 長沙 410083

Author(s):

LIU Shuhong;  LING Dicheng;  HUANG Dandan;  ZHANG Fan;  DU Yong

State Key Laboratory for Powder Metallurgy, Central South University, Changsha, 410083

關鍵詞:

多元鋁合金; 相平衡;  熱力學數據庫; 熱物性參數; CALPHAD方法

DOI:

10.7502/j.issn.1674-3962.2015.04.07

文獻標志碼:

A

摘要:

精確的熱力學、熱物性質數據庫是進行多元多相材料制備過程中微觀結構演變定量描述的關鍵。高性能鋁合金作為航空航天和國民生產用重要結構材料，其制備工藝的優化和設計一直備受關注。本文首先概述了多元多相鋁合金熱力學數據庫構筑的方法及其最新研究進展，重點介紹了多元多相鋁合金相平衡測定的實驗方法和第一原理計算在鋁合金熱力學數據庫構筑中的輔助作用。隨后介紹了多元多相鋁合金擴散系數、粘度、摩爾體積數據庫構筑的最新研究進展。接著給出了三個實例介紹了熱力學數據庫和熱物性質數據庫在鋁合金凝固過程中微觀結構演變模擬的應用。最后簡單總結了多元鋁合金熱力學和熱物性數據庫目前面臨的問題和挑戰。

Abstract:

Thermodynamic properties and phase equilibria are prerequisite for understanding many scientific and technological disciplines. Accurate databases for thermodynamic and thermophysical properties are the key to realize the description of microstructure evolution of multicomponent and multiphase alloys. As super-structural materials for aerospace and civil industry, the optimal process for the aluminum alloys is very important and has received a lot of concerns. This paper firstly provides an overview on the thermodynamic database and the latest research progress on the multicomponent aluminum alloys, especially introducing the application of TEM and 3DAP in the measurement of phase equilibria of the multicomponent alloys as well as the importance of first-principles calculations in the construction of the thermodynamic database. Subsequently, a brief introduction about the recent research on the thermophysical databases of the aluminum alloys, such as diffusion coefficient, molar volume as well as the viscosity, is presented. Then three case studies are described to show how the thermodynamic and thermophysical databases are applied in the simulation of the solidification microstructure of the aluminum alloys. Finally, the major challenges for the development of accurate thermodynamic and thermophysical databases for multicomponent and multiphase aluminum alloys are briefly concluded.