Phase diagrams of the Be, Mg, Zn, Cd and Hg alloys

4 Intermetallic chemistry of Be, Mg, Zn, Cd and Hg 5.12.4.1 Phase diagrams of the Be, Mg, Zn, Cd and Hg alloys. The systematics of the compound formation of these metals in their binary alloys with the different elements is summarized in Fig. 5.33. On the overall they give a rather complex picture even so a number of relationships and similarities between various pairs of metals may be singled out. To go into this point in more detail, in the same figure a comparison has also been made with the compound formation patterns of Ca and A1 which are described in 5.4 and 5.13 but are close in the Periodic Table to the metals here considered. The similarity between the Be and Zn patterns may be underlined, as also that between Be and Al, being an example of the so-called diagonal relationships presented in 4.2.2.2. 

Obvious analogies between Mg and the elements of the 2nd group (notably with Ca) exist. Notice, however, the different behaviour shown in the alloys with the lanthanides and actinides no compound formation is observed with Ca (and Sr, Ba, Eu and Yb) whereas there are several compounds in the alloys with Mg (and Be, Zn, Cd and Hg). As for the patterns given by Zn, Cd, Hg notice the smooth changes along the Periodic Table of the regions where there is, or there is not, compound formation the trend observed in the (sub) group Zn, Cd, Hg is not very different 

Hi Compound-forming element O Phase diagram known no intermediate phases formed No information available H Questionable compound forming capability 

2 Remarks on the melting point trends in the binary alloys of Be, Mg and of the 12th group metals. The intermetallic reactivity of these metals and the stability of their compounds are also highlighted by the trends of the melting points of their alloys. A selection of these data has been collected in Tables 5.57 and 5.58 where compounds of Be and Mg and of Zn and Hg are listed. For several systems, information only on the existence of intermediate phases with no indication about their melting temperature is reported. 

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