Alloy, preparation method therefor and use thereof, porous material, current collector, secondary battery and device

A method for preparing an Mn-M binary multi-phase alloy, comprising:

• smelting Mn and metal M in a weight ratio of (39-78):(22-61) to obtain an Mn-M binary alloy, wherein the standard electrode potential of the metal M is higher than the standard electrode potential of Mn;
• subjecting the resulting Mn-M binary alloy to a first heat treatment to obtain a first product comprising a γMn-M solid solution;
• subjecting the first product to a second heat treatment for crystallizing the first product to obtain a second product;
• subjecting the second product to a third heat treatment to obtain a third product comprising a γM-Mn phase and a γ′Mn-M phase;
• and
• subjecting the third product to a fourth heat treatment to obtain a binary multi-phase alloy comprising an αMn phase, a γM-Mn phase, and a γ′Mn-M phase.