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用真空葛氏扭摆研究了 CuZnAl 形状记忆合金平衡状态试样的内耗。在室温至500℃温度范围内,观测到两个弛豫型内耗峰,峰温分别为240℃和345℃(f≈1.7Hz)。通过改变频率测得240℃峰的弛豫激活能为27kcal/mol,345℃峰的弛豫激活能为42kcal/mol。计算了两个峰的τ_0值,确定345℃峰为α相中 Zener 弛豫峰,240℃峰则是由β有序相内反向畴界某种点缺陷运动所产生。
The internal friction of CuZnAl shape memory alloy in equilibrium state was studied by vacuum Ge’s twist. Two relaxation-type internal friction peaks were observed at room temperature to 500 ° C with peak temperatures of 240 ° C and 345 ° C (f≈1.7 Hz), respectively. The relaxation activation energy at 240 ° C was 27 kcal / mol as measured by changing the frequency, and the relaxation activation energy at 345 ° C was 42 kcal / mol. The τ_0 values of the two peaks were calculated. The peak at 345 ℃ was the Zener relaxation peak in the α phase, and the peak at 240 ℃ was caused by some point defect movement in the reverse domain boundary in the β - ordered phase.