A method comprising: rolling a sheet in a roll mill; the sheet comprising a first metal, and having disposed upon each opposing face of the sheet a first layer that comprises a second metal; the second metal being chemically different from the first metal; and having disposed a second layer upon the first layer, wherein the second layer is disposed upon the opposing faces of the sheet, wherein the second layer comprises a third metal that is chemically different from the first metal and the second metal; wherein the first metal is aluminium, or magnesium; and wherein the second metal is aluminium or magnesium; and wherein the third metal is nickel; cutting the sheet into a plurality of sheets; stacking the plurality of sheets; and rolling the stacked sheets in the roll mill to form a blank; extruding the blank to form an article; wherein the article comprises a plurality of domains fused together, wherein the domains comprise: a core comprising the first metal; a first layer disposed upon the core; the first layer comprising the second metal; a second layer that is disposed upon the first layer, wherein the second layer comprises the third metal; wherein the domains comprise a gradient in composition between the first metal and the second metal; wherein the core has a domain size of 44 to 1400 micrometers, and wherein the plurality of domains have interstices between them; wherein the second metal is present in an amount of 8 to 10 wt%, based on a total weight of the article, and wherein the third metal is present in an amount of 0.01 to 0.1 wt%, based on the total weight of the article. rolling a sheet in a roll mill; the sheet comprising a first metal, and having disposed upon each opposing face of the sheet a first layer that comprises a second metal; the second metal being chemically different from the first metal; and having disposed a second layer upon the first layer, wherein the second layer is disposed upon the opposing faces of the sheet, wherein the second layer comprises a third metal that is chemically different from the first metal and the second metal; wherein the first metal is aluminium, or magnesium; and wherein the second metal is aluminium or magnesium; and wherein the third metal is nickel; cutting the sheet into a plurality of sheets; stacking the plurality of sheets; and rolling the stacked sheets in the roll mill to form a blank; extruding the blank to form an article; wherein the article comprises a plurality of domains fused together, wherein the domains comprise: a core comprising the first metal; a first layer disposed upon the core; the first layer comprising the second metal; a second layer that is disposed upon the first layer, wherein the second layer comprises the third metal; wherein the domains comprise a gradient in composition between the first metal and the second metal; wherein the core has a domain size of 44 to 1400 micrometers, and wherein the plurality of domains have interstices between them; wherein the second metal is present in an amount of 8 to 10 wt%, based on a total weight of the article, and wherein the third metal is present in an amount of 0.01 to 0.1 wt%, based on the total weight of the article. a core comprising the first metal; a first layer disposed upon the core; the first layer comprising the second metal; a second layer that is disposed upon the first layer, wherein the second layer comprises the third metal; wherein the domains comprise a gradient in composition between the first metal and the second metal; wherein the core has a domain size of 44 to 1400 micrometers, and wherein the plurality of domains have interstices between them; wherein the second metal is present in an amount of 8 to 10 wt%, based on a total weight of the article, and wherein the third metal is present in an amount of 0.01 to 0.1 wt%, based on the total weight of the article.