快速凝固/粉末冶金工艺Al-Fe-Mo-Si基复合阻尼材料阻尼性能与机制

Damping Property and Mechanism of Al-Fe-Mo-Si Matrix Composite Damping Materials by Rapidly Solidified/Powder Metallurgy Process

通过对材料动态力学性能的测试,研究了采用快速凝固/粉末冶金工艺制备的Al Fe Mo Si基复合阻尼材料Al Fe Mo Si/Zn Al和Al Fe Mo Si/Al/Zn Al的阻尼性能,并对其阻尼机制进行了讨论。结果表明:在20～250℃的温度范围内,两种材料的阻尼性能(Q-1)处于(0 5～3 1)×10-2之间,复合有较多Zn Al且挤压比较大的Al Fe Mo Si/Zn Al的阻尼性能要优于Al Fe Mo Si/Al/Zn Al。低温时由大挤压变形引入的高密度位错阻尼在材料内耗机制中占据主导地位,而在高温区界面阻尼的影响逐渐增加,同时由于热激活作用,位错阻尼随着温度的升高表现出不同的作用机制,二者共同决定着材料的内耗特性。

The damping property of Al-Fe-Mo-Si matrix composite damping materials Al-Fe-Mo-Si/Zn-Al and Al-Fe-Mo-Si/Al/Zn-Al prepared by rapidly solidified/powder metallurgy (RS/PM) process is studied by means of the measure of dynamic mechanical property, and the damping mechanism of the materials is discussed. The results show that the damping capacity (Q-1) of two materials is (0.5-3.1)×10-2 in the temperature range of 20-250°C. The damping property of Al-Fe-Mo-Si/Zn-Al having more Zn-Al and a higher ratio of extrusion is superior to Al-Fe-Mo-Si/Al/Zn-Al's. At low temperature, the main internal friction mechanism is dislocation damping which is induced by large extrusion deformation, while in the high temperature region, the influence of interface damping increases gradually. For thermal activation, the dislocation damping shows various mechanism with the increase of temperature. The materials' internal friction mechanism is determined by the two factors in common.