用倒扭摆内耗仪测量了含Mn量92.8及90wt-％两种Mn-Cu合金在—100—400℃温度范围的内耗温度谱。除在-40及160℃附近是熟知的孪晶界面弛豫峰和马氏体相变峰(P_?峰)外,还新发现40℃内耗峰(P_2峰)是Spinodal组分分解形成的贫Mn区内的马氏体相变内耗峰。200℃附近的弛豫峰(P_3)与a-Mn的沉淀物有关,激活能为1.1eV。340℃弛豫峰(P_4)是在430℃真空时效过程中逐渐形成的,激活能为1.47eV。
The internal friction was measured as a function of temperature inMn-7.2wt-%Cu and Mn-10wt-%Cu alloys at -100-400℃ by inverted torsionpendulum. The well known peaks at -40℃ and 160℃ are caused by twin boundaryrelaxation and martensitic transformation respectively. The new peak at 40℃is associated with the martensitic phase transformation in the poor Mn region, whichwas frmed by spinodal decomposition. The relaxation peak at 200℃ is attributed toα-Mn precipitate. The activation energy of the peak is 1.1 eV. The relaxation peakat 340℃ occurred only after aging under vacuum at 430℃. The peak height increas-ed through aging. The activation energy is 1.47 eV. The peak is supposed to relateto spinodal decomposition in which the Cu-rich region formed.
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