T. M. Poletika, S. L. Girsova, S. M. Bitter, A. I. Lotkov, K. A. Zheronkina
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引用次数: 0
摘要
摘要 研究了 300-500°C 老化温度对具有晶粒/亚晶粒结构的纳米晶 Ti-50.9%Ni 合金的结构、R 马氏体转变和力学特性的影响。研究发现，纳米结构中相干 Ti3Ni4 颗粒的空间分布从低温时效时位于位错上到加速时效时在位错边界析出的变化，伴随着 R 相形态从纳米域到自容薄片结构的变化。R 相的纳米域结构有助于合金在加载/卸载过程中的均匀变形和超弹性的稳定。当对具有片状 R 相形态的合金进行加载时，R 相会以吕德斯变形方式重新定向，从而形成局部变形带。
Structure, Martensitic Transformations, and Mechanical Properties of Aging Nanocrystalline Ti–50.9 at % Ni Alloy
The effect of aging temperature in the range of 300–500°C on the structure, R martensitic transformations and mechanical characteristics of nanocrystalline Ti–50.9 at % Ni alloy with a grain/subgrain structure was studied. It was found that variation in the spatial distribution of coherent Ti3Ni4 particles in the nanostructure from location on dislocations during low-temperature aging to precipitation at dislocation boundaries under accelerated aging is accompanied by a change in the morphology of the R phase from a nanodomain to a self-accommodating lamellar structure. The nanodomain structure of the R phase contributes to homogeneous deformation of the alloy during loading/unloading and stabilization of superelasticity. When loading the alloy with a lamellar R-phase morphology, localized deformation bands are formed by the R-phase reorientation in a Lüders deformation manner.
期刊介绍：
The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.
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