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共析Al-Zn合金非平衡扩散型相变内耗和模量特征

朱贤方 , 张立德

金属学报

研究了淬火Al-Zn共析合金中非平衡Spinodal预相变和后继的不连续转变低频内耗特征和模量效应。在非平衡Spinodal预相变中,观察到存在着与大幅度长波长的静态浓度波相联系的Spinodal失稳并没有引起局部模量软化效应。Spinodal预转变共格性的出现与消失和不连续转变中相界面面积的最大值,引起各自相应的时效内耗峰,但与峰相应的模量软化效应并未发生。

关键词: Spinodal预相变 , soft Modulus , discontinuous transformation , internal friction

CHARACTERISTICS OF INTERNAL FRICTION AND MODULUS ASSOCIATED WITH NON-EQUILIBRIUM DIFFUSION-TYPE PHASE TRANSFORMATION IN EUTECTOID Al-Zn ALLOY

ZHU Xianfang ZHANG Lide Institute of Solid State Physics , Academia Sinica , Hefei , China Research Assistant , Institute of Solid State Physics , Academia Sinica , Hefei , China

金属学报(英文版)

The characteristics of the low frequency internal friction and the modulus effect associated with the non-equilibrium spinodal pretransformation and the following discontinuous trans- formation was investigated in an as-quenched eutectiod Al-Zn alloy.It was observed that the loss of the stability in the lattice,which corresponded to the large-amplitude long-wavelength static concentration wave in the non-equilibrium spinodal pretransformation,did not induce any effect of localized soft modulus.Although there are two aging internal friction peaks in phase transformation which correspond to the appearance and disappearance of the coherency in spinodal pretransformation and the maximum of the interface area in the discontinuous transformation respectively,the effect of localized soft modulus did not take place yet.

关键词: spinodal pretransformation , null , null , null

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