期刊
MATERIALS & DESIGN
卷 116, 期 -, 页码 427-437出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.12.034
关键词
Cast aluminum alloys; CALPHAD; Thermodynamic modeling; Grain refinement; Mechanical property
资金
- National Natural Science Foundation of China [51474239]
- National Key Research and Development Program of China [2016YFB0301101]
- Project of International Cooperation and Exchanges from the National Natural Science Foundation of China [51611130058]
- State Key Laboratory of Powder Metallurgy Foundation, Central South University, Changsha, China
Using published experimental phase equilibria, a self-consistent thermodynamic database of the Al-Si-Mg-Sc quaternary system in Al-rich corner was established by application of the CALPHAD (CALculation of PHAse Diagram) technique. The reliability of the thermodynamic database was tested in two quaternary model cast alloys by comprehensive comparison of their experimentally measured solidified microstructure characteristics and phase transition temperatures with the calculated ones. Scheil-Gulliver simulations were performed, allowing construction of a solidification diagram for Sc-added A356 alloys to examine the influence of Sc levels on the solidification behavior of cast A356 alloys. With the aid of theoretical solidified microstructure analysis and its qualitative relationship with mechanical properties, the optimal amount of added Sc in P356 alloys was determined to be 0.54 wt.%. The experimental mechanical property measurements and microstructural characterizations confirmed that the F356-0.54 wt.% Sc alloy exhibits the best comprehensive mechanical performance. Additionally, the grain refining mechanisms in Sc-supplemented A356 alloys were described, suggesting a path for further improvement of the overall mechanical performance. (C) 2016 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据