자료유형  

 학위논문

Control Number  

0016932709

International Standard Book Number  

9798379842079

Dewey Decimal Classification Number  

600

Main Entry-Personal Name  

Issahaq, Mohammed Naziru.

Publication, Distribution, etc. (Imprint  

[S.l.] : Purdue University., 2021

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2021

Physical Description  

1 online resource(106 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

General Note  

Advisor: Trumble, Kevin.

Dissertation Note  

Thesis (Ph.D.)--Purdue University, 2021.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약Commercial sheets, strips and wires are currently produced from aluminum alloys by multi-step deformation processing involving rolling and drawing. These processes typically require 10 to 20 steps of deformation, since the plastic strain or reduction that can be imposed in a single step is limited by material workability and process mechanics. In this work, a fundamentally different, single-step approach is demonstrated for producing these aluminum products using machiningbased deformation that also enables higher material workability in the formed product. Two process routes are proposed: 1) chip formation by Free Machining (FM), and 2) constrained chip formation by Hybrid Cutting Extrusion (HCE).Using the very soft and highly ductile commercially pure aluminum alloys as representative systems, various material flow transitions in response to the concentrated shear deformation are observed in FM including plastic instabilities. The flow instabilities usually manifested as folds of varying amplitudes on the unconstrained surface of the chips, are features that limit the desirability of the chip and potential use for strip applications. To suppress these instabilities, two strategies both involving deformation geometry design are outlined: 1) By using large positive rake angle, the flow can be transformed to be more laminar and thus reduces to a substantial amount, the flow instabilities. This also makes it possible for light rolling/drawing reductions to be adopted to smoothen the residual surface folds to improve the strip finish. 2) By using a constraining tool coupled with the cutting tool in what is referred to as HCE, the initial instability that leads to plastic buckling of the material is suppressed, thereby making the flow laminar and thus improve the quality of the strips.Key property attributes of the chips produced by the shear-based deformation processes such as improved mechanical properties and in the case of HCE, superior surface finish compared to conventional processes of rolling/drawing are highlighted. Implications for commercial manufacture of sheet, strip and wire products are discussed.

Subject Added Entry-Topical Term  

Metals.

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Mechanical properties.

Subject Added Entry-Topical Term  

Continuous casting.

Subject Added Entry-Topical Term  

Precipitation hardening.

Subject Added Entry-Topical Term  

Wire.

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Ductility.

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Strain hardening.

Subject Added Entry-Topical Term  

Aluminum alloys.

Subject Added Entry-Topical Term  

Cutting tools.

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Magnesium.

Subject Added Entry-Topical Term  

Microstructure.

Subject Added Entry-Topical Term  

Deformation.

Subject Added Entry-Topical Term  

Alloys.

Subject Added Entry-Topical Term  

Energy consumption.

Subject Added Entry-Topical Term  

Geometry.

Subject Added Entry-Topical Term  

Shear strength.

Subject Added Entry-Topical Term  

Scanning electron microscopy.

Subject Added Entry-Topical Term  

Analytical chemistry.

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Chemistry.

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Energy.

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Materials science.

Subject Added Entry-Topical Term  

Mechanics.

Added Entry-Corporate Name  

Purdue University.

Host Item Entry  

Dissertations Abstracts International. 85-01B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:643531