Reaction Kinetics of Mg₂Si in the Laser Welding Pool of Aluminum Alloys

Abstract:

The metallurgy reactions in the weld pool were analyzed with the application of reaction kinetics. Furthermore a formula to quantificationally calculate the amount of Mg2Si was generated. By means of calculating the thermodynamic condition of the reaction and combined with the verification testing, this article indicates that the metallurgical product Mg2Si was created in the liquid weld pool but not separated out from the arborescent crystal during its solid state. This thesis summarizes the precipitation mechanism of Mg2Si and explains the configuration, amount and location where Mg2Si was separated out by analyzing the phase diagrams and constitution diagrams. Relevant data suggests that: the content of Mg2Si is slightly less than Mg.

• Periodical: Advanced Materials Research (Volume 813)
• Pages: 55-63
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.813.55
• Online since: September 2013
• Authors: Lu Yang, Qing Hua Wang, Jie Li, Yuan Liu, An Guo Huang
• Keywords: Aluminium Alloy, Laser Welding, Mg₂Si, Reaction Kinetics

References

[1] Frank Wilkinson. Fundamentals of Chemical Kinetics (Logan, S. R. ) [J]. Chem. Educ., 2000, 77 (3), p.316.

[2] Aritoshi M, Kikuchi Y, Woo I. Metallurgical and Mechanical Properties of High Nitrogen Austenitic Stainless Steel Friction Welds [J]. ISIJ Int., 2002, 42(4): 401-406.

DOI: 10.2355/isijinternational.42.401

[3] Matthew Elrod. An Introduction to Chemical Kinetics (Margaret Robson Wright) [J]. Chem. Educ., 2005, 82 (1), p.40.

DOI: 10.1021/ed082p40

[4] John R. Krenos. Chemical Kinetics and Reaction Dynamics (Houston, Paul L. ) [J]. Chem. Educ., 2001, 78 (11), p.1466.

DOI: 10.1021/ed078p1466

[5] Gerald Corsaro. Kinetic experiments on collision frequency and micelle effects on reaction rates [J]. Chem. Educ., 1973, 50 (8), p.575.

DOI: 10.1021/ed050p575

[6] K Hono, M Murayama. Pre-precipitate clusters and precipitation processes in Al-Mg-Si alloys [J]. Acta Materialia, Volume 47, Issue 5, March 1999, Pages 1537-1548.

DOI: 10.1016/s1359-6454(99)00033-6

[7] Mark S. Ghiorso, Richard O. Sack. Importance of considerations of mixing properties in establishing an internally consistent thermodynamic database: thermochemistry of minerals in the system Mg2SiO4-Fe2SiO4-SiO2 [J]. Contributions to Mineralogy and Petrology (1989).

DOI: 10.1007/bf01160190

[8] Dongping, Tao. Prediction of the thermodynamic properties of multicomponent liquid alloys by binary infinite dilute activity coefficients [J]. Metallurgical and Materials Transactions B December 2001, Volume 32, Issue 6, pp.1205-1211.

DOI: 10.1007/s11663-001-0109-4

[9] Ki, Hyungson. Modeling and measurement of processes with liquid-vapor interface created by high power density lasers [D]. Ph.D., The University of Michigan, (2001).

[10] M. Collur, P. Sahoo, T. Debroy. Effect of oxygen and sulfur on alloying element vaporization during laser welding [J]. Metall. Trans. B, 1988, 19B: 967~972.

DOI: 10.1007/bf02651420

[11] Ebert T, Mordike B L. Magnesium properties-applications-potential [J]. Mater Sci Eng, 2001, A302: 37.

[12] Apelian K, Shivkamar S, Sigworth G K. The Influence of Molten Metal Processing on Mechanical Properties of Cast Al-Si-Mg Alloys [J]. AFS Trans., 1989: 811～824.