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首页> 外文期刊>Journal of Materials Engineering and Performance >On the Change in Work Hardening Characteristics of Molybdenum Polycrystals Due to Natural Aging
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On the Change in Work Hardening Characteristics of Molybdenum Polycrystals Due to Natural Aging

机译：自然老化引起的钼多晶体加工硬化特性的变化

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摘要

Strips of 99.95 at.% Mo polycrystals annealed at 700℃ as well as the ones annealed and then aged for 6 months at room temperature were deformed in tension at various strain-rates in the range 2.1 × 10~(-4) to 4.2 × 10~(-3) s~(-1) till fracture. It is found that natural aging of the annealed specimens for 6 months leads to 20-30% reduction in the yield stress (YS), 18-22% reduction in the ultimate tensile strength (UTS), and 72-76% reduction in the ductility, i.e. the tensile strain ε_(max) corresponding to UTS, depending on the value of ε in the tensile strain-rate range referred to. Data analysis in terms of the kink-pair nucleation model of flow stress shows that the reduction in YS of the aged Mo specimens is a consequence of lowering of the Peierls energy per interatomic spacing along the length of screw-dislocation segments trapped in the Peierls valleys on the migration of point defects to the dislocation cores during the course of natural aging. The reduction in UTS and ε_(max) is attributed to the variation in the relative contribution of the processes of dislocation multiplication and annihilation together with the reduction in the Peierls stress of the metal.
机译：在700℃退火的99.95 at。％Mo多晶条以及在室温下退火并老化6个月的Mo多晶条在2.1×10〜（-4）至4.2×范围内的不同应变率下的拉伸变形。 10〜（-3）s〜（-1）直至断裂。发现退火样品自然老化6个月可导致屈服应力（YS）降低20-30％，极限抗拉强度（UTS）降低18-22％，而拉伸强度降低72-76％。延展性，即对应于UTS的拉伸应变ε_（max），取决于在所述拉伸应变率范围内的ε值。根据流动应力的扭结对成核模型进行的数据分析表明，老化的Mo样品的YS降低是由于沿Peierls谷中捕获的螺旋位错段的长度，每个原子间距的Pe​​ierls能量降低的结果。自然时效过程中点缺陷向位错核心的迁移UTS和ε_（max）的降低归因于位错倍增和an没过程相对贡献的变化，以及金属的Peierls应力的降低。

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