Effective hydrogen diffusion coefficient for solidifying aluminium alloys

被引：21

作者：

Felberbaum, M. ^{[1
]}

Landry-Desy, E. ^{[1
]}

Weber, L. ^{[2
]}

Rappaz, M. ^{[1
]}

机构：

[1] EPFL STI IMX LSMX, Ecole Polytech Fed Lausanne, Lab Simulat Mat, Stn 12, CH-1015 Lausanne, Switzerland

[2] EPFL STI IMX LMM, Ecole Polytech Fed Lausanne, Lab Met Mecan, Stn 12, CH-1015 Lausanne, Switzerland

来源：

ACTA MATERIALIA | 2011年 / 59卷 / 06期

关键词：

Solidification; Aluminium alloys; Simulation; Synchrotron radiation; Hydrogen diffusion; IN-SITU; THERMAL-CONDUCTIVITY; POROSITY FORMATION; SOLIDIFICATION; MICROPOROSITY; MODEL;

D O I：

10.1016/j.actamat.2010.12.022

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An effective hydrogen diffusion coefficient has been calculated for two solidifying Al - 4.5 wt.% Cu and Al - 10 wt.% Cu alloys as a function of the volume fraction of solid. For this purpose, in situ X-ray tomography was performed on these alloys. For each volume fraction of solid between 0.6 and 0.9, a representative volume element of the microstructure was extracted. Solid and liquid voxels were assimilated to solid and liquid nodes in order to solve the hydrogen diffusion equation based on the chemical potential and using a finite volume formulation. An effective hydrogen diffusion coefficient based on the volume fraction of solid only could be deduced from the results of the numerical model at steady state. The results are compared with various effective medium theories. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2302 / 2308

页数：7

共 23 条

[1]

Anyalebechi PN, 2003, LIGHT MET, P857

[2] Diffusion-controlled growth of hydrogen pores in aluminium-silicon castings:: In situ observation and modelling [J].

Atwood, RC ;

Sridhar, S ;

Zhang, W ;

Lee, PD .

ACTA MATERIALIA, 2000, 48 (02) :405-417

[3] Calculation of various physics constants in heterogenous substances I Dielectricity constants and conductivity of mixed bodies from isotropic substances [J].

Bruggeman, DAG .

ANNALEN DER PHYSIK, 1935, 24 (07) :636-664

[4]

Campbell J., 2003, CASTINGS, V2nd

[5] Modeling the effect of finite-rate hydrogen diffusion on porosity formation in aluminum alloys [J].

Carlson, Kent D. ;

Lin, Zhiping ;

Beckermann, Christoph .

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 2007, 38 (04) :541-555

[6] Effect of volatile elements on porosity formation in solidifying alloys [J].

Couturier, G ;

Rappaz, M .

MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING, 2006, 14 (02) :253-271

[7]

Felberbaum M, 2010, THESIS EFPL LAUSANNE

[8] A Model for Gas Microporosity in Aluminum and Magnesium Alloys [J].

Felicelli, Sergio D. ;

Wang, Liang ;

Pita, Claudio M. ;

De Obaldia, Enrique Escobar .

METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, 2009, 40 (02) :169-181

[9] A VARIATIONAL APPROACH TO THEORY OF EFFECTIVE MAGNETIC PERMEABILITY OF MULTIPHASE MATERIALS [J].

HASHIN, Z ;

SHTRIKMAN, S .

JOURNAL OF APPLIED PHYSICS, 1962, 33 (10) :3125-&

[10]

Hess P.D., 1974, Proc. International Conference on the Effects of Hydrogen on Materials, P277

← 1 2 3 →