Not gonna lie, whatever it is is probably pretty hot.
The relevant part is in bold. Meta-alloys are not magic, and they not made of any super-weird alien elements - there's no such thing as "alien elements". They are simply ordinary metals that have been molecularly engineered at the nanoscale to give them unusual properties. Destroy that nanoscale structure by heating - or, one can logically infer, by dissolving it in acid - and the meta-alloys become a mixture of ordinary, regular metallic elements.Meta-alloys have a complex lattice structure with large internal voids. They are cellular in nature, and formed organically. They are incredibly strong - much stronger than foamed aluminium for example. Many elements form the structure so technically they are alloys, but the composition is different in different parts of the cell walls for strength. They are good thermal insulators, and have a high melting point, but if they are melted they lose all their special properties and become a conventional alloy. They are easily machined, but as yet cannot be manufactured, only found in space. They are associated with recently discovered alien entities nicknamed 'Large Barnacles' by interstellar explorers. These appear to be common in certain parts of space, although no-one is certain why. This material has been heralded as the next step in materials technology. It is ultra-light and stronger and more versatile than most commercially available alloys.