分散强化镍的稳态蠕变

A. Clauer, B. A. Wilcox
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引用次数: 51

摘要

摘要对含不同粒径(220 ~ 550 μ A)和体积分数(0.01 ~ 0.045)的“再结晶”镍硫合金进行了高温蠕变研究。蠕变结果和电镜结构研究表明,控制蠕变速率的过程是边缘位错在ThO2颗粒上的爬升。计算表明,稳态蠕变率(έ s)与粒子大小和间距的关系为e s∝d2/r v,其中d为平均平面中心到中心的粒子间距,r v为平均粒子半径。这一关系与实验观察相符。
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Steady-State Creep of Dispersion-Strengthened Nickel
AbstractHigh-temperature creep studies have been conducted on “recrystallized” nickel-tho ria alloys which contained various ThO2 particle sizes (220-550 A dia.) and volume fractions (0.01-0.045). Creep results, together with structural studies employing electron microscopy, indicate that the rate-controlling creep process is the climb of edge dislocations over ThO2 particles. Calculations predict that the steady-state creep rate, έ s , is related to particle size and spacing by e s ∝ d2/r v , where d is the mean planar centre-to-centre particle spacing, and r v is the average particle radius. This relation is in accord with experimental observations.
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