Patent ID: 8286457

Claim:
A method for controlling variations of Alâ€”Tiâ€”B alloy crystal grain refinement ability through controlling a compression ratio of a cross-sectional area of Alâ€”Tiâ€”B alloy comprising: feeding a Alâ€”Tiâ€”B alloy into a rolling mill having one or more sets of two rollers rotating inward towards each other to be pressed into a shape in a press process; measuring the temperature of the alloy before and after it passes through the rollers; using a cooling module to spray coolant onto the rollers to control the temperature of the rollers and thus the alloy, thereby controlling the difference in temperature (Î”T) between the alloy entering and leaving the rolling mill by manipulating the rate at which the coolant is sprayed onto the rollers such that the alloy temperature stays within a range of temperatures; measuring the cross sectional area of the alloy before (S 1 ) and after (S 2 ) it is pressed by the rolling mill thereby calculating the compression ratio (D) using the equation D=S 1 /S 2 ; varying the speed (V) at which the alloy moves through the rolling mill; altering the number of rollers (n) in the rolling mill; and producing a finished processed piece of Alâ€”Tiâ€”B alloy with a desired crystal grain refinement ability (Î”AA) by establishing a relationship between D, V, Î”T, and n and the crystal grain refinement ability of the alloy represented by the following equation: Î”AA=KÂ·DÂ·V/(Î”TÂ·n), wherein K is a constant whose value is 7.55 and wherein Î”AA=AA1âˆ’AA2 with AAI represents a refinement ability value of the Alâ€”Tiâ€”B alloy before the press process and AA2 representing a refinement ability value of the Alâ€”Tiâ€”B alloy after the press process.