PLASTIC DEFORMATION OF POLYCRYSTALLINE AGGREGATES
PLASTIC DEFORMATION OF POLYCRYSTALLINE AGGREGATES
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DOI：
10.1080/14786436208201857
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发表时间：
1962-01-01
影响因子：
1.6
通讯作者：
PETCH, NJ
中科院分区：
文献类型：
--
作者：
ARMSTRONG, R;DOUTHWAITE, RM;PETCH, NJ
对于一些金属多晶聚集体，实验表明，在恒定应变下的流动应力[sgrave]f与晶粒直径l有关，其中[sgrave] 0和k为常数。这与出现下屈服点时的下屈服点与晶粒尺寸之间的关系具有相同的形式。一个解释是由泰勒理论的扩展，允许在晶界的阻力形成的滑移带。位错锁定和少量的滑移系有利于[sgrave] f的强烈晶粒尺寸依赖性，这解释了常见金属和合金之间的这种依赖性的变化。
For a number of metallic polycrystalline aggregates, it is shown experimentally that [sgrave]f, the flow stress at constant strain, is related to the grain diameterlbywhere [sgrave]0andkare constants. This has the same form as the relationship between the lower yield point, when this occurs, and grain size. An explanation is given by an extension of Taylor's theory to allow for the resistance at the grain boundary to the formation of a slip band. Dislocation-locking and a small number of slip systems are shown to favour a strong grain-size dependence of [sgrave]fand this explains the variation of this dependence amongst the common metals and alloys.