Damping Properties control of the Cu-base high damping alloys and their application to microparts

到目前为止，已经开发出了形状记忆合金、磁性合金、两相合金和软合金等多种减振材料。然而，以前的合金由于强度低，倾倒性能差，不足以满足实际应用的需要。近年来，本课题组开发出了具有高塑性和优良倾倒性能的新型铜基Sm合金。本文研究了这些合金的力学性能和减振性能，并对其在一些工业领域应用的可能性进行了评估，如某些精密机械的微型零件等。主要研究结果如下：1.利用动态机械能谱(DMS)测试了多种不同晶粒度的试件在外加振动的应变和频率条件下的减振性能。结果表明，颗粒尺寸较大的样品具有较好的减振性能。2.对部分织构样品的减振性能也进行了DMS测试。结果表明，织构有效地提高了合金的减振性能。3.通过冷轧试验对织构合金的力学性能进行了评价。验证了这些合金具有足够的成形性，这是实际应用所需要的。4.试制了一种减小音响系统扬声器振动的插片。该薄板具有良好的减振性能，特别是在外加振动的低频区。

Up to now, a lot of damping materials, such as shape memory alloys, magnetic alloys, two-phase alloys and soft alloys, have been developed. The previous alloys, however, are not sufficient for practical applications, because of the low strength and poor dumping properties. Recently, the present research group has developed new Cu-based SM alloys with a high ductility and excellent dumping properties. In the present study, the mechanical and damping properties of these alloys were investigated and a possibility for practical damping materials in some industrial fields, such as microparts in some precision machines etc., was evaluated.The obtained main results are as follows :1.The Damping properties of many specimens with different grain size were examined by dynamic mechanical spectrometer (DMS) in the several conditions on strain and frequency in the applied vibration. It can be concluded that the specimens with large grain size show an excellent damping capacity.2.The damping properties of some specimens with texture were also examined by DMS. It was found that the texture effectively improves the damping capacity.3.The mechanical properties of these texture alloys were evaluated by cold rolling test. It was confirmed that these alloys have an enough formability which will be needed for the practical application.4.An inserting sheet to decrease the vibration generated from speakers in audio system was fabricated on trial. The sheet shows excellent damping properties especially in low frequency field of the applied vibration.