| 摘要 |
PROBLEM TO BE SOLVED: To provide a Mn-Cu damping alloy with which the development of cracking at the working time, is restrained and good damping characteristic can be obtained. SOLUTION: The Mn-Cu damping alloy is obtained by performing the following processes: (1) the solid-solution treatment process, in which the Mn-Cu ingot composed of 15-25 at% Cu and further, 0.001-0.007 at% Ca or 0.005-0.23 at% Mg and the balance Mn with inevitable impurities, is heated to solid-solution temperature of≥800°C and≤solidus line temperature and after holding this solid-solution temperature, this ingot is cooled at cooling speed of air-cooling or more; (2) a working process, in which this alloy solid-solution treated, is worked to a finished product shape or to target-shape or to larger shape than the finished product shape; and (3) a high temperature annealing process, in which the worked alloy is heated to the annealing temperature of≥800°C and≤solidus line temperature and after holding this annealing temperature, the constant speed slow cooling is performed until the temperature of the alloy reaches the range of 250-450°C. COPYRIGHT: (C)2009,JPO&INPIT
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