Shape memory alloy

A biodegradable shape memory alloy, comprising or consisting of:

• Mn at 30% by weight;
• Si at 6% by weight;
• and
• Fe at 64% by weight.

A material for additive manufacturing, the material comprising:

• Mn at between 25 and 35% by weight;
• Si at between 5 and 8% by weight;
• Fe at between 60 and 70% by weight, and
• optionally comprising at least one additional element selected from Cr, Ni, Ag, Nb, Ti, V, Co, Al, W, Sn, B, N, C, S and rare earth elements.

A process for tuning elemental composition of an alloy, comprising the steps:

• obtaining a material for use in additive manufacturing, the material comprising at least two elements;
• and
• exposing the material to an additive manufacturing process;
• whereby, in use, at least a portion of at least one element of the alloy is evaporated during the additive manufacturing process.