On: My Tungsten Cube (2019)

[at_a_remove]

I wonder why it is 5% nickel/iron -- availability? Machining purposes?

[opwieurposiu → at_a_remove]

Because of tungsten has the highest melting point of all metals, it very expensive to cast pure tungsten ingots. Instead, powdered tungsten is mixed with small amounts of powdered nickel or other metals, and sintered.

Also pure tungsten is often excessively brittle.

[zanecodes → at_a_remove]

The Amazon seller mentions that pure tungsten is typically too brittle to machine.

[adammunich → at_a_remove]

Machining