对含Mn量为90％的铸态Mn-Cu合金的马氏体相变内耗进行了研究.用低频测量时,稳定峰(变温速率T=0)的峰温与频率无关,峰高随f的增加而减小,因而不是静滞后型内耗.连续变温的相变峰高与T,f有关,但峰高Q_m~(-1)与T,1/f或T/f都不满足线性关系;在一定振幅范围内(A_ε:1×10~(-5)—1×10~(-4)),峰高与应变振幅基本无关.因而,认为低频变温马氏体相变内耗的大小与相变中共格界面有关,即马氏体相变内耗不仅有体积效应的贡献,而且有界面效应的贡献.
Internal friction of martensitic transformation of as-cast manga-nese-copper alloys with Mn-content 90% was studied. Results show that the peak tem-perature of the stable peak (T=0) at low frequencies is independent of the mea-suring frequency, but the peak height decreases with increasing frequency. It is,therefore, not of a static hysteresis mechanism. The peak height is dependent onT and f at a constant heating or cooling rate, but it does not show a linear rela-tionship with T, 1/f or T/f. The peak height is independent of the strain amplitudein the range (A_e: 1×10~(-5)-1×10~(-4)). Consequently the low frequency internal fric-tion of martensitic transformation is not only a volume effect, but also a surfaceeffect connected with coherent boundaries.
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