Mechanical properties in tension of mechanically attrited nanocrystalline iron by the use of the miniaturized disk bend test

Malow, T.R.; Koch, Carl C.

doi:10.1016/s1359-6454(98)00294-8

Cited by 85 publications

(39 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In particular, the XRD technique seems to offer narrower errors. The relationship between hardness and grain size for the powder milled and for the powder once consolidated at 475ºC are in accordance with similar results reported in the literature [1,6,7]. However, hardness values are slightly lower than expected, especially at 425ºC, probably due to the larger porosity.…”

Section: Resultssupporting

confidence: 91%

“…No evidence of plastic deformation has been found on the two samples. The shear bands reported by some authors have not been found either [5,7]. flat surfaces suggests that crack progresses also through the ferrite grains.…”

Section: Methodsmentioning

confidence: 86%

“…The process is usually carried out in two steps. First, a cold compaction under large pressure, and second a hot compaction at temperatures ranging 400º to 600ºC during holding periods from 30 min until 5 hours [1,5,6,7]. In this second step some grain growth can occur, although the nanometric (or submicrometric) scale is maintained (depending on temperature and time).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of the Nanometric Grain Size Distribution in Iron Compacts Obtained by Mechanical Milling

Llumà

Benito

Roca

et al. 2006

MSF

View full text Add to dashboard Cite

Abstract.A study has been carried out on the grain size distribution of cylindrical compacts obtained by consolidation of iron powder severely deformed by mechanical milling. Consolidation has been performed in two consecutive steps: cold and hot conditions. The hot one was done at two temperatures, namely 425 and 475ºC. After milling, the iron powder has a grain size of 8 nm (± 4 nm) with an average hardness of 800 HV. After hot compaction the grain size increases up to 50 nm, especially at 475ºC where a small fraction of grains reach larger values than the average. The grain size was evaluated by two different techniques, X-Ray Diffraction and Transmission Electron Microscopy. Results showed some differences between both methods. The advantage of using TEM is that grain size distribution, and not only the average size, can be obtained. Small discs were also obtained from the compacted specimen in order to fracture them on a "ball on three balls" equipment. The fracture behaviour of the samples was then studied by SEM.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Methodsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of the Nanometric Grain Size Distribution in Iron Compacts Obtained by Mechanical Milling

Llumà

Benito

Roca

et al. 2006

MSF

View full text Add to dashboard Cite

show abstract

“…The techniques of inert gas condensation, [3,[47][48][49][50] pulsed plasma deposition, [25] and sputtering [48] have exclusively been used for processing thin films or small amounts of nanocrystalline materials, whereas it is necessary to produce/process bulk samples for oxidation/corrosion or mechanical testing. Electrodeposition [33,34,51] and severe plastic deformation [28][29][30][31][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68] have been recognized as the two relatively successful routes for processing thicker/larger sections of nanocrystalline metals and alloys. Pulsed electrodeposition has been employed successfully for processing nanocrystalline materials in bulk, [51] most notably, Ni-Fe and Ni-Co alloys.…”

Section: B Synthesis Of Nanocrystalline Alloysmentioning

confidence: 99%

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

Mahesh

Raman

2014

Metall Mater Trans A

View full text Add to dashboard Cite

The extremely fine grain size of nanocrystalline (nc) metallic alloys results in significantly different mechanical, electrochemical and oxidation properties as compared to the coarse-grained alloys of the same composition. Although the synthesis and attractive mechanical properties of nanocrystalline materials have been investigated and reviewed in great depth, the high temperature oxidation and electrochemical corrosion of these materials has received limited attention. The difference in the active dissolution and passivation behavior of nc alloys as compared to their microcrystalline counterparts varies for each alloy system. However, a unified theory explaining these phenomena still eludes us. In this context, this article reviews the progress in the electrochemical corrosion behavior of different nanocrystalline alloys, and hence, develops a better understanding of the effect of grain size, composition, interfacial phenomena and selective dissolution on corrosion of nanocrystalline alloys. This review also presents the role of nanometric grain size and the associated increase in grain boundary diffusion on the high temperature oxidation of nc alloys. The attractive possibility of enhanced oxidation resistance at lower alloying additions as compared to the coarse-grained alloys has been discussed. Although the primary focus of the article is on ferrous alloy systems, however, the lead studies on the role of ultrafine grain size in oxidation/corrosion behavior of other alloys systems have also been reviewed.

show abstract

“…A typical example of the hardness variation with reciprocal square root of grain size for Fe is shown in figure 1 [6][7][8][9][10][11][12][13] . Grain refinement here has generally been achieved by milling powders.…”

Section: Strength Variation With Grain Size In Conventional Polycrys mentioning

confidence: 99%

The origins of strengthening in nanostructured metals and alloys

Morris¹

2010

REVMETAL

View full text Add to dashboard Cite

Nanostructured metals and alloys have a variety of chemical and physical properties that are greatly modified by the nano-scale of their microstructure. At the same time, these materials generally show very high strength, although ductility or toughness may not be good. Strength increases as the microstructure scale reduces from the macro-micro level and even finer, but sometimes the strength appears to fall as the structure scale approaches the nano level. These strength variations are examined here, and the mechanisms responsible for both strengthening and weakening are discussed. The fall in ductility and toughness as materials become nanostructured is a complex topic that requires extensive analysis, but this will not be treated in the present overview. KeywordsNanomaterials; Mechanical properties; Strength; Grain size; Hall-Petch strengthening. El origen del endurecimiento de metales y aleaciones nanoestructurados ResumenLos metales y aleaciones nanoestructuradas muestran una serie de propiedades químicas y físicas fuertemente modificadas cuando su microestructura entra en la escala nano. A la vez, estos materiales muestran generalmente alta resistencia pero mediocre ductilidad o tenacidad. La resistencia aumenta cuando baja la escala de la microestructura desde el nivel micro hacia el nivel nano, pero a veces la resistencia parece reducir por las microestructuras mas finas. Se examinan aquí todas estas variaciones y se discuten los mecanismos responsables del endurecimiento y ablandamiento. Los cambios de ductilidad o tenacidad cuando la microestructura entra en la escala nano necesitan un aná-lisis detallado que no se trata en este articulo.

show abstract

Mechanical properties in tension of mechanically attrited nanocrystalline iron by the use of the miniaturized disk bend test

Cited by 85 publications

References 45 publications

Study of the Nanometric Grain Size Distribution in Iron Compacts Obtained by Mechanical Milling

Study of the Nanometric Grain Size Distribution in Iron Compacts Obtained by Mechanical Milling

Role of Nanostructure in Electrochemical Corrosion and High Temperature Oxidation: A Review

The origins of strengthening in nanostructured metals and alloys

Contact Info

Product

Resources

About