Encyclopedie de la recherche sur l'aluminium au Quebec - Edition 2014 | Page 60
Thermodynamic modelling
of the Al-Cu-Mg-Si system
Modélisation
MODÉLISATION THERMODYNAMIQUE DU SYSTÈME Al-Cu-Mg-Si
thermodynamique du
système Al-Cu-Mg-Si
THERMODYNAMIC MODELLING OF THE Al-Cu-Mg-Si SYSTEM
TRANSFORMATION ET APPLICATIONS // TRANSFORMATION AND APPLICATIONS
Senlin Cui
1
1
and In-Ho Jung
1
Department of Mining and Materials Engineering, McGill University, Montreal, QC, Canada
Objective : To develop a “one-piece” aluminum-extruded
front rail for GM automobile ( APC project)
Petrov and Nagorskaya (1949): Thermo analysis
60 wt.% Al, 8 wt.% Si
800
Liquid (L)
700
Front end
L + Q+Mg2Si
L + Si
L+Q
fcc + τ + Mg2Si
fcc + τ + Mg2Si+S
fcc + S + Mg2Si
fcc + AlCu_θ + Mg2Si
300
fcc + AlCu_θ + Mg2Si + S
fcc + AlCu_θ + Si + Q
400
L + fcc + Mg2Si
fcc + τ + Mg2Si+Al3Mg2
L + fcc + Mg2Si+S
500
fcc + AlCu_θ +Mg2Si + Q
Temperature , ºC
L + Mg2Si
L + Q + Si
600
fcc + AlCu_θ + Q
58
200
0
0.1
0.15
0.2
0.25
Zh. Obshch. Khim. 1949 (19) 1994-2037
0.08
Fcc_A1+Si
Fcc_A1+Mg2Si
Fcc_A1+Q
Fcc_A1+Si+Q
Fcc_A1+Q+Mg2Si
fcc + Mg2Si + S
Fcc_A1+Si+Mg2Si
Fcc_A1+Q+Mg2Si+Si
fcc + Q + Mg2Si
0.03
fcc + Q
Weight fraction Cu
fcc + Al2Cu + Mg2Si + S
fcc + Al2Cu + Mg2Si
Smith (1961)
0.04
0.02
fcc + Si
0.01
Fcc_A1+Si+Al2Cu
Fcc_A1+Al2Cu+Q+Si
Fcc_A1+Al2Cu+Q
Fcc_A1+Al2Cu+Q+Mg2Si
fcc+Mg2Si+Si+Q
L + fcc + Mg2Si
0.00
0.01
0.02
0.03
Fcc_A1+Al2Cu+Mg2Si
Fcc_A1+S+Mg2Si
fcc + Mg2Si
o
500 C, 1.2wt.% Si
fcc+Mg2Si+Si
0.00
High quality thermodynamic database is needed.
fcc + Al2Cu + Q + Mg2Si
0.05
fcc + Si + Q
Scheil cooling to predict as-cast microstructure
Equilibrium calculation for as-annealed
microstructure
fcc + Al2Cu + Q
Process for the Al front rail manufacturing (figures are from internet)
fcc + Si + Al2Cu
0.06
fcc + Si + Al2Cu + Q
0.07
0.04
0.05
0.06
0.07
Weight fraction Mg
0.08
0.09
0.12
Metallurgia 1961 223-231
Smith (1961)
Weight fraction Si
fcc + Si + Al2Cu
0.05
Fcc_A1+Al2Cu
Fcc_A1+Si+Al2Cu
fcc + Si + Al2Cu + Q
0.06
G (T , x1 , x2 ,......)
0.11
0.08
0.07
Thermodynamic database is a data file to store the Gibbs
energy of each phase of the system.
0.10
Isothermal section with 1.2 wt.% Si at 500 ºC
Task Objective : To develop a thermodynamic database for
6XXX series alloys----Al-Cu-Mg-Si sub-system
Senlin Cui
In-Ho Jung
Département de génie
des mines et des matériaux,
Université McGill
0.3
Isopelthal section with 60 wt.% Al and 8 wt.% Si
Task 2: Thermodynamic calculations
0.05
Weight fraction Mg
Eur. Transp. Res. Rev. 2009 (1) 5–10
fcc + Si + Q
Fcc_A1+Q+Si+Al2Cu
Fcc_A1+Q+Al2Cu
Fcc_A1+Q+Mg2Si+Al2Cu
Fcc_A1+Mg2Si+Al2Cu
0.04
Fcc_A1+Mg2Si+S+Al2Cu
Fcc_A1+S+Mg2Si
0.03
Fcc_A1+S
Fcc_A1+S+Al2Cu
0.02
Fcc_A1+Q
o
500 C, 4.5 wt.% Cu
0.01
fcc + Mg2Si + S
fcc + S
fcc + Al2Cu
fcc + L +Mg2Si
0.00
Molar Gibbs energy of a
ternary solution
Unary → Binary →Ternary → Multi-components
Gibbs energy for pure elements (SGTE database)
Liquid phase: modified quasi-chemical model
Solid phases: compound energy formalism
0.00
0.01
0.02
0.03
0.04
0.05
Weight fraction Mg
0.06
0.07
0.08
0.09
Isothermal section with 4.5 wt.% Cu at 500 ºC
Metallurgia 1961 223-231
Thermodynamic modelling in the Al-Rich area of
the Al-Cu-Mg-Si system was performed using the
CALPHAD method and FactSage.
The newly obtained thermodynamic parameters
can be used for the refinement of FTlite database
and for alloy design in the automobile industry.
As étudiants – Automotive Partnership Canada (APC) project with GM, we
Journée despart of the integrated REGAL
Dans le cadre du projet de Partenariat automobile du Canada (PAC) avec GM, nous
développons une nouvelle base de données thermody