Dear William,
I would need more information, such a the natiure
of the non-metallic inclusions, and the major element
content of the alloy, to answer question fully,but are
you sure about the Mg. It could be the As La line you are
seeing which occurs in about the same place as Mg Ka. The
energies of the two lines are Mg Ka 1.25 and As La
1.28kV, therefore, they are indistinguishable by EDS.
Unfortunately, the Pb La line masks the As Ka, however,
if there is no line at 2.307/2.345 kV (S Ka/Pb Ma) then
it is likely that arsenic is present.
If As has been interpreted as Mg at 4.5% level
the whole of the analysis will be incorrect, obviously at
lower concentrations the errors caused by using an
incorrect element set will be lessened.
> Dear List Members,
>
>
> I have some bronze samples examined with SEM and found
that there are a lot of Fe and Mg in bronze artifacts,
with both 0.6-4.5% weight. They are not from rust layers
and are most come from metal crystals. Strangely, the
non-metallic inclusions do not consist of Fe or Mg. Of
course there is not relation between Fe and Mg, for they
are relatively independent in content. Some samples have
Fe and have no Mg, while some others have not Fe but have
Mg, or both. I referred it to the phase features and knew
the most contents of Fe and Mg in Cu are much lower than
4.5%. Does anyone happened to know the reasons? Thanks
for your help.
>
>
> Best Regards
>
> William Qian
>
> <italic><color><param>8080,8080,0000</param>Institute of Historical
> Metallurgy & Materials
>
> University of Science & Technology Beijing
>
> 30 Xueyuan Road, Beijing, 100083, P.R.China
>
>
> Tel: 086-10-62332534
>
> Fax: 086-10-62327283
>
> E-mail: [log in to unmask]
>
> </color></italic>
Chris Salter
-------------------------------------------------
E-mail [log in to unmask]
Dept of Materials,
Oxford University,
Parks Rd,
OX1 3PH, England
Telphone
+44 1865 273728 Office (Answer Phone)
+44 1865 273933 SEMPROBE
+44 1865 273794 Fax
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