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金属学报  2003 

相变内耗与伪滞弹性

, PP. 1121-1126

Keywords: 内耗,模量,软模,相变,伪滞弹性

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Abstract:

Fe-Ni-C在扩散型(珠光体)相变时呈现较高的内耗峰,说明相界面(尤其是高能相界面)的运动对相变内耗起到重要作用,建议建立一个内耗峰值与相界面能量之间的关系式,Fe-Ni-C中贝氏体相变的内耗特征与珠光体的相似,贝氏体相变孕育期内已发现相变内耗峰.结合溶质区的实验结果,证明贝氏体相变系扩散形核马氏体相变中相界面能量较低,导致其内耗峰值低于扩散型相变的峰值.马氏体相变的软模现象为相变形核机制提供启迪.fcc→hcp反铁磁相变抑制了马氏体相变动力学,但促发了fcc→fct相变,在ZrO2-CeO2一Y2O3陶瓷中,因m→t逆相变而引起的滞弹性可称其为伪滞弹性,其弛豫时间长达数日之久.

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