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Lead inclusions in aluminium

Published online by Cambridge University Press:  25 February 2011

E. Johnson ,
L. Gråbaek ,
J. Bohr ,
A. Johansen ,
L. Sarholt-Kristensen  and
H.H. Andersen
E. Johnson
Affiliation:
Physics Laboratory, H.C. Ørsted Institute, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
L. Gråbaek
Affiliation:
Physics Department, RisO National Laboratory, 4000 Roskilde, Denmark
J. Bohr
Affiliation:
Physics Department, RisO National Laboratory, 4000 Roskilde, Denmark
A. Johansen
Affiliation:
Physics Laboratory, H.C. Ørsted Institute, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
L. Sarholt-Kristensen
Affiliation:
Physics Laboratory, H.C. Ørsted Institute, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
H.H. Andersen
Affiliation:
Physics Laboratory, H.C. Ørsted Institute, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
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Abstract

Ion implantation at room temperature of lead into aluminium leads to spontaneous phase separation and formation of lead precipitates growing topotactically with the matrix. Unlike the highly pressurised (∼ 1–5 GPa) solid inclusions formed after noble gas implantations, the pressure in the lead precipitates is found to be less than 0.12 GPa.

Recently we have observed the intriguing result that the lead inclusions in aluminium exhibit both superheating and supercooling [1]. In this paper we review and elaborate on these results. Small implantation-induced lead precipitates embedded in an aluminium matrix were studied by X-ray diffraction. The (111) Bragg peak originating from the lead crystals was followed during several temperature cycles, from room temperature to 678 K. The melting temperature for bulk lead is 601 K. In the first heating cycle we found a superheating of the lead precipitates of 67 K before melting occurred. During subsequent cooling a supercooling of 21 K below the solidification point of bulk lead was observed. In the subsequent heating cycles this hysteresis at the melting transition was reproducible. The full width of the hysteresis loop slowly decreased to 62 K, while the mean size of the inclusions gradually increased from 14.5 nm to 27 nm. The phenomena of superheating and supercooling are thus most pronounced for the small crystallites. The persistence of the hysteresis loop over successive heating cycles demonstrate that its cause is intrinsic in nature, and it is believed that the superheating originates from the lack of free surfaces of the lead inclusions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 157: Symposium A – Beam-Solid Interactions: Physical Phenomena , 1989 , 247
Copyright
Copyright © Materials Research Society 1990

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References

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