热弹性马氏体相变弛豫特性的研究  

On relaxation properties of thermoelastic martensitic transformation

作　　者：叶冠群[1] 宫晨利[1] 朱成忠[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2011年第1期52-54,97,共4页Journal of Hefei University of Technology：Natural Science

基　　金：国际合作日本NSGF资金资助项目(200412)

摘　　要：文章研究了Cu-Al-Ni—Mn-n合金热弹性马氏体相变的弛豫特性。实验结果表明，母相的本征内耗随振动频率的降低而衰减，在某一临界频率下出现内耗峰。随着等温测量温度的降低，内耗峰的峰高增加，峰位降低，这说明马氏体相变前母相内部已经发生了预相变，该弛豫应归结为滞弹性弛豫。当升温速率为0．25～3．80℃／min时，滞弹性弛豫时间为4．005-0．372S，并且快速衰减至一个平衡值。The relaxation properties of thermoelastic martensitic transformation in Cu-Al-Ni-Mn-Ti shape memory alloy are studied. The experimental results show that the intrinsic internal friction values in parent phase attenuate with the decrease of vibration frequency, and an internal friction peak emerges at a critical frequency. The internal friction peak becomes higher and its location decreases as isothermal measuring temperature drops. This confirms that there exists a pre-phase transformation in the parent phase before the martensitic transformation takes place, which belongs to the anelastic relaxation When the heating rate is from 0. 25 ℃/min to 3.80℃/min, the anelastic relaxation time changes from 4. 005 s to 0. 372 s and decays quickly to an equilibrium value.

关 键 词：铜基形状记忆合金 热弹性马氏体相变 滞弹性弛豫 弛豫时间 

分 类 号：TG111.5[金属学及工艺—物理冶金]