Grain-size effect on plastic flow stress of nanolaminated polycrystalline aluminum/graphene composites

The flow of material out from under regions in compression must occur by the operation of many slip systems, which together produce rotational flow. Such flow requires the accumulation of geometrically necessary dislocations, and leads to the indentation size effect: smaller indents produce higher hardness, a component of the hardness being inversely proportional to the square-root of the indenter size. A pattern of flow in polycrystals which satisfies both continuity of normal stress and continuity of matter at boundaries can be achieved by rotational flow, and it leads to a grain-size effect. Under most circumstances, the flow stress has a component which is inversely proportional to the square-root of the grain size, the Hall-Petch law. The flow is accompanied by the build-up of internal stress which can be relieved by intercrystalline cracking, thereby limiting the cohesive strength of polycrystals. The relationship between these ideas and traditional views is briefly explained, and an analysis is given of recent experimental results.

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Micro–macro modelling of the effects of the grain size distribution on the plastic flow stress of heterogeneous materials

Computational Materials Science ◽

10.1016/j.commatsci.2006.02.019 ◽

2007 ◽

Vol 39 (1) ◽

pp. 96-105 ◽

Cited By ~ 58

Author(s):

S. Berbenni ◽

V. Favier ◽

M. Berveiller

Keyword(s):

Grain Size ◽

Flow Stress ◽

Size Distribution ◽

Plastic Flow ◽

Grain Size Distribution ◽

Heterogeneous Materials ◽

Plastic Flow Stress

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The grain size effect on the flow stress of polycrystals

Scripta Metallurgica ◽

10.1016/0036-9748(85)90051-1 ◽

1985 ◽

Vol 19 (11) ◽

pp. 1281-1283 ◽

Cited By ~ 12

Author(s):

C.R. Chiang

Keyword(s):

Grain Size ◽

Flow Stress ◽

Size Effect ◽

Grain Size Effect

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Grain-size effect on plastic flow in nanocrystalline cobalt by atomistic simulation

Acta Materialia ◽

10.1016/j.actamat.2006.07.034 ◽

2007 ◽

Vol 55 (1) ◽

pp. 149-159 ◽

Cited By ~ 12

Author(s):

G ZHENG

Keyword(s):

Grain Size ◽

Size Effect ◽

Plastic Flow ◽

Atomistic Simulation ◽

Grain Size Effect

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Localized Plastic Flow Autowaves and the Hall-Petch Relation for Al

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.592-593.271 ◽

2013 ◽

Vol 592-593 ◽

pp. 271-274

Author(s):

Lev B. Zuev ◽

Natalya Zarikovskaya

Keyword(s):

Plastic Deformation ◽

Grain Size ◽

Flow Stress ◽

Plastic Flow ◽

Flow Patterns ◽

Localized Deformation ◽

Polycrystalline Aluminum ◽

Petch Relation ◽

Grain Sizes ◽

Localization Of Plastic Deformation

The localization of plastic deformation was examined for polycrystalline aluminum samples having grain sizes in the range from 8·10-3to 10 mm. It is found that the length of localized deformation autowaves is determined by the grain size of material. The localized plastic flow patterns emergent in the polycrystalline aluminum samples are found to be connected to the Hall-Petch relation. Two types of flow stress dependencies of grain size are distinguished.

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