According to this analysis, it is obvious that exceptions are locations of "star-like"
iron-containing crystals. Indeed, precisely in these areas there is a maximum amount
of iron and aluminum and very small amount of copper. Amount of iron beyond these
phases is minimal. Aluminum distributes at micro sample intersection in significant
number with obvious maximums, corresponding to peaks of iron in "star-like" crystals.
Zinc exists in alloy components in very small amount with obvious segregation in
eutectic sites.
Actual number of components in iron-containing phase crystals of the studied
bronze was determined by the method of energy-dispersive analysis. Examples of
quantitative components microanalysis are shown in Figure 2.3.
a
b
a – Spectrum 1, b – Spectrum 2
Figure 2.3. Results of bronze BrA9Zh3L quantitative X-ray energy-dispersive
analysis
Source: analyzed by the authors
Quantitative research data according to five measurements results are presented
in Table 2.3.
Table 2.3 data analysis shows that "star-like" crystals (see Figures 2.1, 2.2, 2.3)
are iron-containing phase with ratio of iron 81,20 ... 82,79 wt.% to 9,86 ... 10,39 wt.%
aluminum. This quantitative relation corresponds to the area of Fe-Al binary diagram
[12-15] which is zone of phase β
1
(Fe
3
Al) stability.
In addition, in this phase, according to energy-dispersive analysis data, dissolved
copper (see Table 2.3) and zinc (from 0,0 wt.% to 0,68 wt.% – depending on it content
in alloy per GOST 493 [4] – see Table 2.1) have been recorded.
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