Flow stress dependence on the grain size in alumina dispersion-strengthened copper with a bimodal grain size distribution
Flow stress dependence on the grain size in alumina dispersion-strengthened copper with a bimodal grain size distribution
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DOI：
10.1016/j.msea.2009.04.022
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发表时间：
2009-08
期刊：
影响因子：
6.4
通讯作者：
A. Afshar;A. Simchi
中科院分区：
文献类型：
--
作者：
A. Afshar;A. Simchi
Cu-2.7vol中流变应力对晶粒尺寸的依赖性。研究了具有双峰结构的%Al2O3（15nm）复合材料。结果表明，根据“混合规律”选取合适的平均晶粒尺寸时，屈服强度符合Hall-Petch方程。霍尔-佩奇常数（σ0和k α）与应变成正比，为α 0.5。提出了流动应力作为真应变和平均晶粒尺寸的函数的方程。氧化铝纳米颗粒对屈服强度的影响与大量位错密度有关。
The grain size dependence of flow stress in Cu–2.7vol.%Al2O3(15nm) composite with a bimodal structure was studied. It is shown that the yield strength obeys the Hall–Petch equation when an appropriate value of average grain size based on the “rule of mixture” is employed. The Hall–Petch constants (σ0ɛand kɛ) are proportional to strain as ɛ0.5. An equation for flow stress as a function of true strain and average grain size is proposed. The effect of alumina nanoparticles on the yield strength is shown to be related to large amounts of dislocations density.