The invention relates to a
nickel-based
alloy with high grain-
boundary strength and a preparation method thereof. The
nickel-based
alloy consists of the chemical components in percentage by weight; 20-25 percent of
chromium, 0.2-0.7 percent of
copper, 0.01-0.2 percent of carbon, 8.0-10.0 percent of
molybdenum, 10-15 percent of
cobalt, 0.5-1.5 percent of aluminum, 0.2-0.6 percent of
titanium, 0.01-0.02 percent of
boron, 0.01-0.03 percent of
tungsten, 0.01-0.3 percent of
tantalum, 0.02-0.06 percent of
rare earth and the balance of
nickel and other unavoidable trace
impurity elements. The preparation method for the nickel-based
alloy with high grain-
boundary strength comprises the following steps of (1) preparing raw materials: preparing a proper amount of Incone1617 main material and a small amount of Re, B, Ta and W for component adjustment; and (2) feeding the materials for
smelting: putting the materials Cr, Mo, Ta and W which have high
smelting points to the bottom of a
crucible, then adding the Incone1617 furnace material, sequentially adding the rest of the raw materials, covering the materials with a
slag removal agent, and
smelting the materials in a vacuum smelting furnace. By the adding of B, Ta and the
rare earth elements, the nickel-based alloy is low in environment sensitivity and can achieve effects of purifying the
grain boundary and effectively improving the grain-boundary
bonding strength.