Why Do We Study Ultra-High Purity Base Metals?

Abiko, K.

doi:10.2320/matertrans1989.41.233

Cited by 13 publications

(8 citation statements)

References 39 publications

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“…We frequently refer to terms such as ''commercial purity'' and ask for the number of 9's, but intrinsically, we know that the materials we work with do not solely consist of elemental atoms. In the field of ''Ultra-High-Purity Base Metals'' (UHPM), [114] it is recognized that trace impurities can have large effects on various properties [115] and, in general ultrapure metals have shown higher ductility, lower recrystallization temperatures and lower strength and hardness values compared to the same commercially pure metals. [116,117] From the beginning, [21,46] in the majority of materials processed by mechanical milling or severe plastic deformation methods, there have been a multitude of impurities, whether introduced, in the case of the former, or unavoidably maintained in the starting material of the latter.…”

Section: On the Role Of ''Dirt'' On Grain Boundary Stabilizationmentioning

confidence: 99%

“…This leads into a concern, combined with an opportunity for growth in the nanostructured metals community. We certainly cannot go the way suggested by the UHPM community [114] who conclude that ''the inherent properties of metals cannot be predicted based on the knowledge of traditional metallurgy […] the starting point of fundamental research for discovering the inherent properties should be the ultra-purification of metals.'' Philosophically, this mirrors the disparity between Gleiter (who wanted defects) and solid-state physicists (who wanted perfection).…”

Section: --mentioning

confidence: 99%

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Building on Gleiter: The Foundations and Future of Deformation Processing of Nanocrystalline Metals

Mathaudhu

2020

Metall Mater Trans A

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In 1989, fueled by his prior reports and findings, Prof. Herbert Gleiter published a seminal work on the synthesis, processing, and possibilities for nanocrystalline materials. This spark exploded into the field of bulk nanocrystalline metals by severe plastic deformation processing, with the primary driver being attaining the ultimate strength of a metal through refinement of the grain sizes to a level approaching the theoretically possible limits. This paper will briefly explore the historical development of SPD and based on Turnbull's strategy of ''energizing and quenching'' materials to attain a desirable metastable state, present thoughts on incipient-related areas of exploration, including thermal stabilization through solute additions, the role of trace impurities and interstitials, the smallest grain size achievable (both theoretically and practically), and the captivating yet hazy character and role of the grain boundary. Lastly, some new approaches to making and then controlling the behavior of nanocrystalline materials will be presented. At each stage, opportunities for future study will be raised. On the 50th Anniversary of Metallurgical and Materials Transactions A, it is hoped that this report will build off the seed planted by Gleiter and inspire new work and collaborations in the years to come.

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Section: On the Role Of ''Dirt'' On Grain Boundary Stabilizationmentioning

confidence: 99%

Section: --mentioning

confidence: 99%

Building on Gleiter: The Foundations and Future of Deformation Processing of Nanocrystalline Metals

Mathaudhu

2020

Metall Mater Trans A

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“…Recently many kinds of properties of high-purity Fe-50 mass%Cr alloys have been reported, since Abiko and co-workers developed ductile Fe-50 mass%Cr alloys by purification. 1) We reported that high-purity Fe-50 mass%Cr alloys show specific deformation properties: deformation twinning occurs continuously at 773 K up to 10% strain during the plastic deformation in tensile tests.…”

Section: Introductionmentioning

confidence: 98%

Effect of Aging on the Tensile Properties of High-Purity Fe-50Cr Alloys

2002

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The effects of strain rate and aging on the tensile property of high-purity Fe-50 mass%Cr and 166 mass ppm carbon-doped Fe-50 mass%Cr alloys were investigated by tensile tests and microstructural observations. The serration occurring by dynamic strain aging on the stress-strain curves disappears at the strain rate below 4.2 × 10 −5 s −1 and above 1.7 × 10 −2 s −1 at 773 K in a high-purity Fe-50 mass%Cr alloy with the grain size of 29 µm. The deformation twinning in a high-purity Fe-50 mass%Cr alloy with the grain size of 108 µm at 773 K occurs at the same stress of 480 MPa, independent of strain rate. The pre-strained specimen of high-purity Fe-50 mass%Cr alloy shows static strain aging after aging at 573 K. The aging treatment at 773 K causes the precipitation of carbides and thereby the formation of deformation twins in tensile tests. In a carbon-doped high-purity Fe-50 mass%Cr alloy, the heat treatment for precipitating carbides on grain-boundaries restrains the formation of deformation twins at 773 K.

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“…Recently Abiko et al [1][2][3] succeeded to develop the ductile Fe-50Cr alloys by means of elimination of interstitial impurity and reported the peculiar deformation properties. However, the detailed deformation mecha -nisms of those Fe-high Cr alloys are remained not certain yet.…”

Section: Introductionmentioning

confidence: 99%

Deformation Mechanism of [001] Oriented Fe-30%Cr Alloy Single Crystals

Miura

Koushima

2003

Journal of the Society of Materials Science, Japan

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To analyze the rate-controlling mechanism of Luders deformation found in the [001] oriented Fe-30%Cr alloy single crystals_ the activation volume and the activation enthalpy were obtained by a strain-rate and temperature change method during the deformation from 293K to 511K and were found to be respectively. Aging at 473K was made after extension by 23.5%. The Luders band didn't move on further straining and the second Luders band started from opposite side of the chuck. It was considered that the Luders front was aged and locked by some solute atoms. The line intensity of carbon atom fairly increased around the Luders front after aging. The interaction of moving dislocations and carbon atom is considered to be the most likely rate-controlling mechanism for the deformation. The activation distance was calculated to be times larger than carbon diameter and would be reasonable value considering the moving dislocations overcome carbon atoms.

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Why Do We Study Ultra-High Purity Base Metals?

Cited by 13 publications

References 39 publications

Building on Gleiter: The Foundations and Future of Deformation Processing of Nanocrystalline Metals

Building on Gleiter: The Foundations and Future of Deformation Processing of Nanocrystalline Metals

Effect of Aging on the Tensile Properties of High-Purity Fe-50Cr Alloys

Deformation Mechanism of [001] Oriented Fe-30%Cr Alloy Single Crystals

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