Nonuniform recrystallization in a mechanically alloyed nickel-base superalloy

Murakami, Kenichi; Mino, Kazuaki; Harada, Hiroshi; Bhadeshia, H. K. D. H.

doi:10.1007/bf02657235

Cited by 23 publications

(10 citation statements)

References 8 publications

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“…Recrystallization has very fast kinetics and is characterised by the fact that only a few grains grow abnormally [25,26]. The grains that developed at high temperature are also elongated in the extrusion direction [20,21,26]. Similar behaviour has also been reported in this FeAl ODS alloy [19,27 -29].…”

Section: Texture and Microstructure Modificationsmentioning

confidence: 53%

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Primary recrystallization in an ODS FeAl alloy: an effective way to modify texture and microstructure

2004

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Section: Texture and Microstructure Modificationsmentioning

confidence: 53%

“…1c). This is a feature common to ODS alloys prepared by extrusion of milled powders [20,21]. The texture of the as-extruded material was characterised by a fairly strong k110l fibre, at about 8 times random, parallel to the extrusion axis with a spread in the directions towards k210l.…”

Section: Starting Materialsmentioning

confidence: 95%

Primary recrystallization in an ODS FeAl alloy: an effective way to modify texture and microstructure

2004

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“…[24][25][26] The particles hinder boundary motion more effectively in the transverse direction. Figure 7 shows the large difference, about four orders of magnitude, in the measured interfacial velocities as a function of orientation relative to the extrusion direction.…”

Section: Observation Of Grain Boundary Motionmentioning

confidence: 99%

Grain Boundary Mobility in Fe-Base Oxide Dispersion Strengthened PM2000 Alloy

et al. 2003

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It has been possible to measure the average interfacial velocities of grain boundaries during the process of recrystallisation of an oxide dispersion-strengthened iron-base alloy manufactured using the mechanical alloying technique. The measurements could be made using optical microscopy because the recrystallised grains are orders of magnitude larger than the surrounding unrecrystallised material. Furthermore, the peculiar way in which the alloy recrystallises, made it possible to observe large, flat segments of boundaries as they advanced into the higher energy matrix. The data have been analysed bearing in mind the pinning effect of the non-random distribution of oxide particles. It is concluded that the boundaries have a high mobility. This conclusion adds to the growing evidence that the alloy has great difficulty in nucleating recrystallisation because of the ultrafine and uniform starting-microstructure in which the grain boundary junctions are so closely spaced that they prevent strain-induced grain boundary migration; in other words, the junctions themselves are powerful pinning points.

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“…In the case of this extruded material, observation along a transverse section revealed a clear alignment of the particles along the extrusion direction [21]. This is a feature common to alloys prepared by extrusion of reinforced milled powders [33][34][35]. The texture of the as-extruded material was characterised by a fairly strong C110D fibre, at about eight times random, parallel to the extrusion axis with a spread in the directions towards C210D.…”

Section: Starting Material Heat Treatments and Characterisationmentioning

confidence: 89%