CU-AL-MN SERIES SHAPE MEMORY ALLOY AND ITS MANUFACTURE

摘要

PURPOSE:To manufacture the shape memory alloy having ferromagnetism by cooling the solid soln. of a Cu-Al-Mn series alloy having specified componental compsn. under specified conditions and executing aging treatment at the above temp. CONSTITUTION:The solid soln. of an alloy constituted of, by weight, 11.5 to 12.5% Al, 4 to 8% Mn and the balance Cu is cooled to the temp. range from the martensite transformation starting temp. (Ns point) of the alloy to 200 deg.C at the cooling rate (about 5 to 100 deg.C/min) not so as to cause the precipitation of a proeutectoid and eutectoid resolution, is held for a long time at the above temp. and is subjected to aging treatment. By the aging treatment, a Cu2MnAl superstructure is formed in the alloy to obtain the Cu-Al-Mn series shape memory alloy having ferromagnetism.