本文研究了CuZnAl合金在马氏体及马氏体相变时的阻尼性能。结果表明,在马氏体状态的内耗是一种M/M界面内耗,利用位错内耗理论的表达式可解释其变化规律。在马氏体相变区的内耗,包括M/M界面内耗及相变内耗两级分,其中相变内耗又由马氏体逆转变产生的内耗及应力诱发马氏体内耗两部分组成,并且前者占主导地位、合金阻尼性能的衰减与激振过程中引入的位错有关,并在一定振动次数后趋向一稳定值。
The internal friction as martensite state is believed to be an M/Minterface one, which can be explained as an expression deduced from the theory ofdislocation internal friction. The internal friction in the region of martensitic trans-formation consists of two parts, including ones of the M/M interface and of thephase transformation. The later is further composed of two portions, the majorproduced by reverse martensitic transformation and the other from stress-inducedmartensite. It was also found that the degradation of dampling properties of theCuZnAl alloys is related to the dislocation, which is introduced from the excitingprocess, and tends to a stable value after certain excitements.
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