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首页> 外文期刊>Physical mesomechanics >Thermal Stability of Nanostructured Internally Oxidized Vanadium Alloy with Combined Dispersion and Substructural Hardening
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Thermal Stability of Nanostructured Internally Oxidized Vanadium Alloy with Combined Dispersion and Substructural Hardening

机译：纳米结构内氧化钒合金的热稳定性分散和副结构硬化

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The paper studies the effect of the annealing temperature on microstructural transformation and micro-hardness variation in an internally oxidized vanadium alloy V-Cr-ZrO2 deformed by high-pressure torsion in Bridgman anvils. It is shown that the development of large plastic strains and subsequent annealing of the particle-reinforced V-Cr-ZrO2 alloy lead to the formation of a fine-grained structure (with about 1 mu m grain size) with a high density of high-angle boundaries pinned by ZrO2-based nanoparticles. Such high-defect states are characterized by a more than twofold increase in microhardness with the major contribution of grain boundary hardening. The conducted research has revealed the main relaxation features of V-Cr-ZrO2 alloy deformed by high-pressure torsion at room temperature. The heat treatment of the studied material at 800 degrees C is shown to activate recovery and polygonization. Primary recrystallization is observed upon temperature increase to 900 degrees C. A further increase in temperature in the interval 950-1050 degrees C intensifies collective recrystallization, due to which the fraction of equi-axed grains increases significantly. Secondary recrystallization is activated at 1200 degrees C and, as a result, individual grains grow in size. These processes are accompanied by a decrease in the V-Cr-ZrO2 alloy microhardness from 3500 to 2000 MPa. Dispersion and substructural hardening are analyzed, and their contribution to the strength is studied. It is shown that the high thermal stability of the nanostructural and fine-grained states is ensured by the high density of uniformly distributed ZrO2-based nanoparticles (of size 3-10 nm) that pin the high-angle grain boundaries.
机译：本文研究了退火温度对通过高压摩尔科尔斯高压扭转造成的内部氧化钒合金V-Cr-ZrO2中的微观结构转化和微硬度变化的影响。结果表明，大塑料菌株的发展和随后的颗粒增强的V-Cr-ZrO2合金的退火导致形成细粒结构（粒度约1μm粒度），高密度高 - 由ZrO2基纳米粒子固定的角度边界。这种高缺陷状态的特征在于微硬度增加了多重的增加，具有晶界硬化的主要贡献。所进行的研究揭示了V-Cr-ZrO2合金的主要弛豫特征，在室温下通过高压扭转变形而变形。示出了800℃的研究的热处理，以激活回收和多边形。在温度升高至900摄氏度时观察到初级重结晶。间隔950-1050℃的温度进一步增加，增强集体再结晶，因此等轴晶粒的级分显着增加。二次重结晶在1200℃下被激活，结果，个体晶粒的尺寸增大。这些方法伴随着从3500至2000MPa的V-Cr-ZrO2合金微硬度减少。分析了分散和子结构硬化，研究了它们对强度的贡献。结果表明，通过将高角度晶界（大小3-10nm）的均匀分布的ZrO2的纳米颗粒（大小3-10nm）的高密度确保了纳米结构和细粒的高稳定性。

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