不同一级相变材料的内耗峰形成机制  

Investigations on Mechanisms of the Internal-friction Peak of First-order Phase Transformation in Solids

作　　者：杨开巍[1] 水嘉鹏[2] 朱震刚[2] 

机构地区：[1]中南大学物理科学与技术学院,长沙410083 [2]中国科学院固体物理研究所,合肥230031

出　　处：《上海交通大学学报》2010年第5期650-654,共5页Journal of Shanghai Jiaotong University

基　　金：中国科学院创新基金资助项目(KJCX2-SW-W17)

摘　　要：试验研究了3种一级相变材料的相变过程,即非晶PdNiCuP的晶化与无序和有序型相变、形状记忆合金Cu-11.9Al-2.5Mn的无扩散位移型相变以及共析合金Zn-22Al的共析相变,设计并测量了3种材料的电阻和内耗,并采用插值法获得不同温度下内耗与频率的关系曲线.结果表明,3种材料的相变内耗峰不是弛豫型内耗峰,而是弛豫参数发生突变的结果,相变内耗峰高度与频率的关系是弛豫的表现.在低温区域,观测到其相变内耗峰的结构弛豫现象,并可用结构失稳和结构弛豫的概念定性解释升温速率对相变内耗峰高度的影响.Experimental study was carried on the crystallization of amorphous Pd43Ni10Cu27P20 ordered-disordered type phase transformation,non-proliferation of displacement-type phase transformation of shape memory alloy CuAlMn,and eutectoid phase transformation eutectoid ZnAl alloy.The simultaneous measurements of resistance and internal friction of three kinds of materials were designed and completed.And the frequency curve of internal friction at different temperatures was obtained by using interpolation.The results show that the internal friction-temperature curve is not the relaxation-type internal friction peak,but the response to abrupt change of the relaxation parameters.The height of internal friction peak is（related） to the degree of relaxation.During low temperature range,structural relaxation is observed,and structural instability and structural relaxation can be used for qualitative interpretation of the influence of heating rate on the height of internal friction peak of phase transformation.

关 键 词：内耗 约化电阻率 一级固态相变 

分 类 号：O469[理学—凝聚态物理]