项目名称: 镍钛基形状记忆合金大塑性变形非晶相形成机理及纳米晶化机制的多尺度研究
项目编号: No.51305092
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 机械、仪表工业
项目作者: 赵亚楠
作者单位: 哈尔滨工程大学
项目金额: 25万元
中文摘要: 纳米晶镍钛基形状记忆合金因为具有优良的综合力学性能、超弹性、耐蚀性和生物相容性,广泛应用于生物医学工程领域。本项目提出了一种新型包套压缩大塑性变形技术,可以实现镍钛基形状记忆合金的非晶化,对非晶镍钛基合金进行合适的热处理晶化,可以制备纳米晶镍钛基形状记忆合金。将包套压缩实验、热处理晶化实验、微观结构分析实验、晶体塑性有限元和元胞自动机相结合,通过宏观尺度、介观尺度、微观尺度和原子尺度的多尺度研究手段,探索奥氏体相镍钛基形状记忆合金在包套压缩下的应力诱发马氏体相变、变形孪晶及位错滑移塑性变形机制;研究马氏体相镍钛基形状记忆合金在包套压缩下的马氏体再取向、去孪生及位错滑移塑性变形机理;建立镍钛基形状记忆合金包套压缩塑性变形非晶相形成时的临界位错密度模型;揭示镍钛基形状记忆合金包套压缩塑性变形非晶相形成机理及非晶镍钛基合金的纳米晶化机制,为制备高性能的纳米晶镍钛基形状记忆合金提供科学的理论基础。
中文关键词: 形状记忆合金;镍钛基合金;大塑性变形;非晶化;纳米晶化
英文摘要: Nanocrystalline Nickel-Titanium-based shape memory alloy (NiTi SMA) is widely used in the biomedical engineering field since it possesses comprehensive mechanical properties, superior superelasticity,high corrosion resistance and perfect biocompatibility. In the present study, as a novel severe plastic deformation(SPD)technique, canning compression provides a new approach to causing the amporphization of NiTi SMA. In addition, the nanocrystalline NiTi SMA can be obtained by means of crystallization of amophous phase in the case of the appropriate heat treatment.By combining canning compression process experiment, heat treatment crystallization experiment, microscopic structure analysis experiment, crystal plasticity finite element method and cellular automaton simulation, from the macroscale, mesoscale, microscale and atomic scale perspective, it shall be able to lay the scientific and theoretical foundations for manufacturing nanocrystalline NiTi SMA with high properties to explore stress-induced martensite phase transformation, deformation twinning and dislocation-slip plastic deformation of austenitic NiTi SMA under canning compression, investigate martensite reorientation,detwinning and dislocation-slip plastic deformation of martensitic NiTi SMA under canning compression, establish the critical dislocation
英文关键词: Shape memory alloy;NiTi-based alloy;Severe plastic deformation;Amorphization;Nanocrystallization