Im·pov'er·ish·ment noun [ Confer Old French empoverissement , and French appauvrissement .] The act of impoverishing, or the state of being impoverished; reduction to poverty. Sir W. Scott. Found on http://www.encyclo.co.uk/webster/I/23
Loss of any constituent from an alloy or from localized areas of an alloy by oxidation, liquidation, volatilization, or changes in the solid state. The term depletion is also used, particularly in referring to the lowering of the concentration of solute in a solid solution, around particles precipitated from solid solution. Found on https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/