Network of Porosity Formed in Ultrafine-Grained Copper Produced by Equal Channel Angular Pressing

被引：53

作者：

Ribbe, Jens ^{[1
]}

Baither, Dietmar ^{[1
]}

Schmitz, Guido ^{[1
]}

Divinski, Sergiy V. ^{[1
]}

机构：

[1] Univ Munster, Inst Mat Phys, D-48149 Munster, Germany

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 16期

关键词：

SEVERE PLASTIC-DEFORMATION; BOUNDARY DIFFUSION; MECHANICAL-PROPERTIES; GROWTH; METALS; ALLOY; KINETICS; NICKEL;

D O I：

10.1103/PhysRevLett.102.165501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Radiotracer experiments on diffusion of Ni-63 and Rb-86 in severely deformed commercially pure copper (8 passes of equal channel angular pressing) reveal unambiguously the existence of ultrafast transport paths. A fraction of these paths remains in the material even after complete recrystallization. Scanning electron microscopy and focused ion beam techniques are applied. Deep grooves are found which are related to original high-energy interfaces. In-depth sectioning near corresponding triple junctions reveals clearly multiple microvoids or microcracks caused by the severe deformation. Long-range tracer penetration over tens of micrometers proves that these submicrometer-large defects are connected by highly diffusive paths and that they appear with significant frequency.

引用

页数：4

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