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A new experimental phase diagram investigation of Cu-Sb.

Fürtauer S, Flandorfer H - Monatsh. Chem. (2012)

Bottom Line: Generally, the structural descriptions of the various binary phases given in the literature were verified.The range of homogeneity of the ε phase (Cu3Ti type) was found to be higher on the Sb-rich side.Most of the reaction temperatures were verified, but a few had to be revised, such as the eutectoid reaction [Formula: see text] at 440 °C (found to occur at 427 °C in this work) and the eutectoid reaction [Formula: see text] at 400 °C (found to occur at 440 °C in this work).

View Article: PubMed Central - PubMed

Affiliation: Department of Inorganic Chemistry/Materials Chemistry, University of Vienna, Währingerstraße 42, 1090 Vienna, Austria.

ABSTRACT

Abstract: The binary system Cu-Sb is a constituent system that is studied in investigations of technically important ternary and quaternary alloy systems (e.g., casting alloys and lead-free solders). Although this binary system has been thoroughly investigated over the last century, there are still some uncertainties regarding its high-temperature phases. Thus, parts of its phase diagram have been drawn with dashed lines in reviews published in the literature. The aim of this work was to resolve these uncertainties in the current phase diagram of Cu-Sb by performing XRD, SEM-EDX, EPMA, and DTA. The results from thermal analysis agreed well with those given in the literature, although some modifications due to the invariant reaction temperatures were necessary. In particular, reactions located on the Cu-rich side of the nonquenchable high-temperature β phase (BiF3-type) left considerable scope for interpretation. Generally, the structural descriptions of the various binary phases given in the literature were verified. The range of homogeneity of the ε phase (Cu3Ti type) was found to be higher on the Sb-rich side. Most of the reaction temperatures were verified, but a few had to be revised, such as the eutectoid reaction [Formula: see text] at 440 °C (found to occur at 427 °C in this work) and the eutectoid reaction [Formula: see text] at 400 °C (found to occur at 440 °C in this work). Further phase transformations that had previously only been estimated were confirmed, and their characteristic temperatures were determined.

No MeSH data available.


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New version of the Cu–Sb phase diagram
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Fig4: New version of the Cu–Sb phase diagram

Mentions: To investigate the solubility ranges of the phases, we performed SEM/EDX measurements on polished samples. We were especially interested in determining the ranges of homogeneity of the phases that had been only tentatively fixed in the literature ([3], dashed lines). All of the results of the EDX measurements along with BSE images of the examined samples can be found in Table 7. Overall, the ranges of homogeneity were found to fit well to the currently accepted phase diagram in the literature [3]. The solubility limits indicated by the dashed lines for the ε phase, η phase, and the high-temperature region of the δ phase were determined. For the ε phase, an extension of the phase field to higher Sb concentrations than those estimated in the literature [3] was observed, and the η phase was also found to occur at higher Sb concentrations (see Tables 7, 8; Fig. 4). Even the very narrow two-phase field between the δ and the ζ phases was confirmed by EDX and XRD measurements of the sample with 20.5 at% Sb (see Table 5).Table 3


A new experimental phase diagram investigation of Cu-Sb.

Fürtauer S, Flandorfer H - Monatsh. Chem. (2012)

New version of the Cu–Sb phase diagram
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4495028&req=5

Fig4: New version of the Cu–Sb phase diagram
Mentions: To investigate the solubility ranges of the phases, we performed SEM/EDX measurements on polished samples. We were especially interested in determining the ranges of homogeneity of the phases that had been only tentatively fixed in the literature ([3], dashed lines). All of the results of the EDX measurements along with BSE images of the examined samples can be found in Table 7. Overall, the ranges of homogeneity were found to fit well to the currently accepted phase diagram in the literature [3]. The solubility limits indicated by the dashed lines for the ε phase, η phase, and the high-temperature region of the δ phase were determined. For the ε phase, an extension of the phase field to higher Sb concentrations than those estimated in the literature [3] was observed, and the η phase was also found to occur at higher Sb concentrations (see Tables 7, 8; Fig. 4). Even the very narrow two-phase field between the δ and the ζ phases was confirmed by EDX and XRD measurements of the sample with 20.5 at% Sb (see Table 5).Table 3

Bottom Line: Generally, the structural descriptions of the various binary phases given in the literature were verified.The range of homogeneity of the ε phase (Cu3Ti type) was found to be higher on the Sb-rich side.Most of the reaction temperatures were verified, but a few had to be revised, such as the eutectoid reaction [Formula: see text] at 440 °C (found to occur at 427 °C in this work) and the eutectoid reaction [Formula: see text] at 400 °C (found to occur at 440 °C in this work).

View Article: PubMed Central - PubMed

Affiliation: Department of Inorganic Chemistry/Materials Chemistry, University of Vienna, Währingerstraße 42, 1090 Vienna, Austria.

ABSTRACT

Abstract: The binary system Cu-Sb is a constituent system that is studied in investigations of technically important ternary and quaternary alloy systems (e.g., casting alloys and lead-free solders). Although this binary system has been thoroughly investigated over the last century, there are still some uncertainties regarding its high-temperature phases. Thus, parts of its phase diagram have been drawn with dashed lines in reviews published in the literature. The aim of this work was to resolve these uncertainties in the current phase diagram of Cu-Sb by performing XRD, SEM-EDX, EPMA, and DTA. The results from thermal analysis agreed well with those given in the literature, although some modifications due to the invariant reaction temperatures were necessary. In particular, reactions located on the Cu-rich side of the nonquenchable high-temperature β phase (BiF3-type) left considerable scope for interpretation. Generally, the structural descriptions of the various binary phases given in the literature were verified. The range of homogeneity of the ε phase (Cu3Ti type) was found to be higher on the Sb-rich side. Most of the reaction temperatures were verified, but a few had to be revised, such as the eutectoid reaction [Formula: see text] at 440 °C (found to occur at 427 °C in this work) and the eutectoid reaction [Formula: see text] at 400 °C (found to occur at 440 °C in this work). Further phase transformations that had previously only been estimated were confirmed, and their characteristic temperatures were determined.

No MeSH data available.


Related in: MedlinePlus