Abstract
The degassing behaviour and surface characterization of Al-Mg base alloys has been investigated using quadrupole mass spectrometry (QMS) and X-ray photoelectron spectroscopy (XPS). The alloy composition, particle size and the nature of the atomizing gas have been studied in terms of gas evolution and surface composition. XPS has been used both to measure oxide thicknesses and magnesium enrichment ratios. XPS results show that magnesium segregation increases for larger particle sizes and this is supported by QMS, with a correspondingly higher hydrogen evolution on heating being observed for the larger size fractions. High-resolution XPS of the carbon 1s photoelectron peak (C1s) indicates the presence of carbonate component on the as-received magnesium-containing powders. This component is less pronounced on degassed powders indicating the evolution of CO2 on heating. This observation is supported by thermodynamic calculations.
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References
H. Jones,Philos. Mag. B61 (1990) 587.
N. J. Grant,J. Metals 35 (1983) 20.
Idem, in “Conference on Rapidly Solidified Powders”, Wurzburg, 1984, edited byS. Steeb andH. Warrlimont (1984) p. 3.
Idem, in “Advances in Powder Technology” (1980) Ch. 1, p. 1.
F. H. Froes andJ. R. Pickens,J. Metals 36 (1984) 14.
Y. W. Kim, W. M. Griffith andF. H. Froes, ASM Metals/Material Tech Series No 8305-048 (1984).
Idem, J. Metals 37 (8) (1985) 27.
Idem, “Rapidly solidified powder Al alloys”, ASTM STP 890, edited byM. E. Fine andE. A. Starke Jr (ASTM, Philadelphia, PA, 1986) p. 283.
L. Ackermann, I. Guillemin, R. Lalauze andC. Pijolat, in “High Strength PM Al alloys 2”, edited byG. J. Hildermand andM. J. Koczak (Metallurgical Society of AIME, Warrendale, PA, 1986) p. 175.
I. Olefjor-d andA. Nylund,Surf. Interface Anal. 12 (1988) 401.
H. Schlich, M. Thumann andG. Wirth, “PM Aerospace Materials”, paper 31 (1987).
S. D. Kirchoff, J. Y. Adkins, W. M. Griffith andI. A. Martorell, “Rapidly Solidified Powder Aluminium Alloys”, ASTM STP 890, edited byM. E. Fine andE. A. Starke Jr (ASTM, Philadelphia, PA, 1986) p. 354.
T. J. Carney, P. Tsakiropoulos, J. F. Watts andJ. E. Castle,Int. J. Rapid Solid. 5 (1990).
T. J. Carney, PhD thesis, University of Surrey, Guildford (1990).
J. F. Watts andT. J. Carney, in “Powder Metallurgy: An Overview”, edited by J. V. Wood (The Institute of Metals, London, 1991) pp. 76–99.
I. Olefjord, H. J. Mathieu andP. Marcus,Surf. Interface Anal. 15 (1990) 681.
D. Briggs andM. P. Seah, in “Practical Surface Analysis”, 2nd Edn (Wiley, Chichester, 1983) Appendix 6.
P. M. A. Sherwood,ibid. in “, Appendix 3.
D. R. Stull andH. Prophet, Project Directors, “JANAF Thermochemical Tables”, 2nd Edn (Office of Standard Reference Data, National Bureau of Standards, Washington, DC, 1970).
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Davis, S.J., Miodownik, A.P. & Watts, J.F. Degassing and surface analysis of gas atomized aluminium alloy powders. J Mater Sci 30, 3811–3819 (1995). https://doi.org/10.1007/BF01153939
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DOI: https://doi.org/10.1007/BF01153939