Do the physical properties of alloys, which are a mechanical mixture of the smallest crystals of two metals

Do the physical properties of alloys, which are a mechanical mixture of the smallest crystals of two metals, differ from the properties of the metals themselves? What are the melting points of pure tin and lead and their alloy containing one-third of lead and two-thirds of tin? Where are these alloys used?

The physical properties of the alloys differ from the physical properties of the metals included in its composition.
For example, an alloy consisting of two parts of tin and one part of lead melts at 180 ° C, while lead melts at 328 ° C and tin at 231 ° C.
This alloy is used as a solder (material used in brazing to join workpieces).

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