Effect of SiC reinforcement particles on the grain density in a magnesium-based metal-matrix composite: Modelling and experiment

被引：40
|
作者：
Lelito, Janusz [1 ]
Zak, Pawel L. [1 ]
Shirzadi, Amir A. [2 ,3 ]
Greer, A. Lindsay [3 ]
Krajewski, Witold K. [1 ]
Suchy, Jozef S. [1 ]
Haberl, Katharina [4 ]
Schumacher, Peter [4 ]
机构：
[1] AGH Univ Sci & Technol, Fac Foundry Engn, Dept Foundry Proc Engn, PL-30059 Krakow, Poland
[2] Open Univ, Mat Engn Grp DDEM, Milton Keynes MK7 6AA, Bucks, England
[3] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England
[4] Univ Leoben, Dept Met, A-8700 Leoben, Austria
来源：
ACTA MATERIALIA | 2012年 / 60卷 / 6-7期
关键词：
Casting; Grain refinement; Metal-matrix composites (MMCs); Modelling; Nucleation and growth; HETEROGENEOUS NUCLEATION; SOLIDIFICATION KINETICS; AZ91/SIC COMPOSITE; DUCTILE IRON; REFINEMENT; MICROSTRUCTURE; SIMULATION; ALUMINUM; INTERFACES; GRAPHITE;
D O I：
10.1016/j.actamat.2012.01.058
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The aim of this work is to develop a numerical model capable of predicting the grain density in the Mg-based matrix phase of an AZ91/SiC composite, as a function of the diameter and total mass fraction of the embedded SiC particles. Based on earlier work in a range of alloy systems, we assume an exponential relationship between the grain density and the maximum supercooling during solidification. Analysis of data from cast samples with different thicknesses, and mass fractions and particle diameters of added SiC, permits conclusions to be drawn on the role of SiC in increasing grain density. By fitting the data, an empirical nucleation law is derived that can be used in a micro-macro model. Numerical simulations based on the model can predict the grain density of magnesium alloys containing SiC particles, using the diameter and mass fraction of the particles as inputs. These predictions are compared with measured data. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：2950 / 2958
页数：9
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